Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
Foreword Added 0 Additional parts "22" and "23" mentioned that are planned but not published yet (Mar-2006).
1.1.1 Clarified 2 IEC 60950-1 applies as well to components and subassemblies intended for incorporation in ITE. 1.1.3 Modified 1 "Support systems" were deleted from list of excluded examples. 1.2.2.3 New 1 RATED RESTING TIME replaces subclauses 1.2.2.3~5 (CONTINUOUS OPERATION, SHORT-TIME OPERATION and INTERMITTENT OPERATION). 1.2.5.3 New 0 PLUGGABLE EQUIPMENT as definition covering both pluggable equipment types A and B. 1.2.8.3 New 0 MAINS SUPPLY as definition covering both AC and DC mains supply. 1.2.9.7 New 0 RMS WORKING VOLTAGE introduced as defined term. 1.2.10.4 New 0 SOLID INSULATION introduced as defined term. 1.2.13.15 New 0 CHEESECLOTH introduced as defined term. 1.2.13.16 New 0 WRAPPING TISSUE introduced as defined term. 1.2.13.17 New 0 PROTECTIVE CURRENT RATING introduced as defined term which is similar to previous term "current rating of the circuit under test" of subclause 2.6.3.4. 1.3.3 Clarified 1 If the test voltage is not specified in a test item the rated voltage or any value in the rated voltage range shall be used for test. 1.4.8 Modified 1 "Note 2" added for additional requirements of USA and Canada for overvoltage protection of TNV circuits. 1.4.14 Clarifi ed 1 Adding to third paragraph: "The failure of functional insulation is only simulated when required by 5.3.4 c)" (risk of fire, risk of electric shock). 1.5.1 Modified 0 Adding "Note 3" (Switzerland does not allow mercury switches) and deleting second paragraph and old "Note 3". 1.5.6 Modified 0 Complete change of subclause by adding information from IEC 60384-14. However, application principle of X- and Y-capacitors not changed. 1.5.7 Modified 2 Complete change and concept for bridging resistors. Detailed requirements for: · Resistors bridging functional/basic/supplementary insulation (1.5.7.1) · Resistors double/reinforced functional insulation (1.5.7.2) · Resistors double/reinforced functional insulation – Special requirements when connected to antenna/coaxial cable (1.5.7.3) 1.5.7.1 Only subclauses 2.10.3 and 2.10.4 (distances) apply to such resistors. 1.5.7.2 Very different concept: · Single resistor is acceptable if it passes "Resistor test" · Group of resistors must either pass "Resistor test" or pass subclauses 2.10.3 and 2.10.4 (distances) with each resistor short-circuited in turn "Resistor test": Damp heat test of IEC 60068-2-78 plus impulse test and resistance measurement. 1.5.7.3 Same as 1.5.7.2 above but with different impulse generator for circuits with coaxial cable connection. 1.5.9 New 2 Requirements for varistors (VDR) specified. 1.5.9.1 Secondary circuit surge suppressors: any suitable component allowed Primary circuit surge suppressors: only VDR allowed. 1.5.9.2 An interrupting means must be provided for protection of the VDR in series. 1.5.9.3 It is allowed to bridge functional insulation by VDR, no additional requirements. 1.5.9.4 It is allowed to bridge basic insulation by VDR with additional requirements: · one side of the VDR must be earthed · only possible for pluggable equipment type B or permanently connected equipment or equipment with permanently connected earthing conductor · more restrictions for countries FI, NO, SE 1.5.9.5 It is not allowed to bridge supplementary/double/reinforced insulation by VDR. 1.6.1 Modified 0 "Note" for Australian national difference was deleted. 1.7.1 Clarified 0 Clarification for the use of the Class II symbol. 1.7.2 Modified 0 Re-arranging of content of subclauses 1.7.2, 1.7.10 and 1.7.16.
? : Level of importance (0=not, 3=very) Page 3 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
1.7.2.1 Adding new "Notes" and deleting old subclause 1.7.12: · "Note 3": Requirements for languages of instructions and markings · "Note 4": German language for safety relevant servicing instructions · "Note 5": For Canada instructions and markings must be in English and French 1.7.2.2 "Disconnect devices", formerly part of subclause 1.7.2. 1.7.2.3 "Overcurrent protective devices", formerly part of subclause 1.7.2. 1.7.2.4 "IT power distribution systems", formerly part of subclause 1.7.10. 1.7.2.5 "Operator access with a tool", formerly part of subclause 1.7.16. 1.7.2.6 "Ozone", formerly part of subclause 1.7.2. 1.7.3 Modified 0 Re-phrasing due to the newly introduced definition 1.2.2.3 replacing "short - time operation" and "intermittent operation". 1.7.11 Modified 1 (Old subclause 1.7.13) As an alternative to petroleum "n-hexane" is introduced for the durability test of markings.
2.1.1.1 b) Modified 0 List of connectors that do not need to be tested with the test finger extended: IEC 60309, IEC 60320, IEC 60906-1, IEC 60906-2. 2.1.1.1 Clarified 0 Editorial layout change for paragraph addressing testing at voltages exceeding 1000 V a.c. or 1500 V d.c. Figure 2D added for clarifying the measurement procedure for internal conductive parts. 2.1.1.6 Modified 1 Adding requirement for TNV circuit separation and requiring an electric strength test for verification. 2.1.1.7 Clarified 0 No discharge test (for voltage hazard) is necessary for mains supplies at SELV levels. Permanently connected equipment was moved to subclause 2.1.2. 2.1.1.8 New 2 Energy hazard test necessary for DC mains powered equipment with test procedures for capacitors and batteries that are connected to the DC mains supply: · After 2 s: 20 J max. and voltage exceeds 2 V · 240 VA for a period of 60 s and voltage exceeds 2 V 2.1.1.9 New 2 Testing of audio amplifier output terminals for accessibility of hazardous voltages (either according to IEC 60950-1 subclause 2.1.1.1 or IEC 60085 subclause 9.1.1). 2.1.2 Modified 2 Additional requirements in service access areas: · Limits of subclause 2.1.1.7 apply (discharge) · Limits of new subclause 2.1.1.8 apply (energy of d.c. mains supplies) with exception of permanently connected equipment · Markings and instructions required if a hazardous energy level exists 2.2.2 Clarified 0 "Note 2" added for the describing the relationship between ELV and SELV. 2.2.3 Modified 1 "Figure 2E" and paragraph afterwards added describing limits for repetitive voltages during fault conditions ("hiccup" mode).
Sub-paragraphs 2.2.3.1~3 were moved to new paragraph 2.9.4. 2.3.2 Modified 1 · Adding "Note" to remind that there are additional requirements for FI, NO and SE (similar to old "Note 7"). · Moving text into 4 new subclauses 2.3.2.1~4. 2.3.2.1 General overview about TNV circuit separation alternatives. Manufacturer can on his choice treat TNV-1 and TNV -2 circuits as TNV -3. Separation by subclause 2.10.5.13 "wire with solvent-based enamel" is one acceptable separation method. 2.3.2.2 First alternative: Protection by basic insulation Unchanged concept but clear requirement for electric strength test added.
? : Level of importance (0=not, 3=very) Page 4 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.3.2.3 Second alternative: Protection by earthing · Previous "Note 5" became paragraph "d)". · New "Note" added linking for certain earthing constructions to the new subclause 2.3.2.4. · Otherwise concept only adjusted to fit new term "pluggable equipment". · Information added that single-fault testing is done without short- circuiting of insulation that does not meet basic insulation if this is more severe. 2.3.2.4 Third alternative: Protection by other constructions · Moving old "Note 7" to subclause 2.3.2 and deleting old "Note 8" · Test procedure described for equipment that has no reliable earthing (see as well "Note" of subclause 2.3.2.3) 2.3.3 Modified 0 Most content moved to new paragraph 2.9.4. 2.3.4 Modified 0 Delete old "Note 3". 2.4 Clarified 0 Clarified compliance information and added "Note" for accessible conductive parts that are connected to limited current circuits (LCC). 2.5 Modified 3 · Deleted fifth dashed paragraph (regulating network for normal condition plus protection device for fault condition) · Clarification of the load adjustment during fault testing · Change of voltage and power limits (100 VA generally) and testing time for Isc and S (changed from 60 s to 5 s) in Table 2B 2.6.3.3 Modified 0 · "Protective current rating" defined and used as basis for design of bonding conductors and test · Clarification about which "protective current rating" is applying to different supply connection types · New "Notes 1-3" describing the current rating of the typical building wiring overcurrent protective device (UK, US, CA, other countries) and defining "protective current rating" accordingly 2.6.3.4 Modified 3 · Clarification for test procedure for: - Separation method 3 - Earthing of transformer winding · For equipment with "protective current rating" not exceeding 16 A the test current is increased from 150% to 200% of the "protective current rating" (AC and DC mains supplied equipment) · For equipment with "protective current rating" exceeding 16 A the test duration is changed from 2 minutes to 2-10 minutes · Alternative test method for equipment with "protective current rating" exceeding 16 A with 200% of the "protective current rating" for 200% of the duration according to the time-current characteristic of the protection device · Requirements for DC mains supplied equipment with "protective current rating" exceeding 16 A to be specified by the manufacturer · New requirements for circuits where the separation of TNV circuits relies on earthing (subclause 2.3.2.3): for 120 s a test current of 150% of TNV- or cable distribution system operation current (with 2 A min.) 2.7.1 Modified 0 Compliance instruction added: inspection necessary. 2.7.2 Clarified 0 Replace "faults not covered" with "faults not simulated". 2.9.3 Modified 0 Adding description for BOUNDING SURFACE and adding compliance instruction: inspection necessary. Table 2H Clarified 0 · Adding references to note "c" for key "B9", "d" for "B8", "B10", "B12" and "f" for "B13" (all addressing TNV circuit separation). · Text of "Note" became standard text ("conductive part"). 2.9.4 Modified 0 Description of separation methods (formerly in subclauses 2.2.3.1~3) · Clarified descriptions for methods · Added "Note 2" which suggests to take the consequences of earthing via interconnection to other equipment into account 2.10.1 Modified 0 Editorial changes for better readability and including requirements for circuits generating starting pulses. Introduction of subclauses 2.10.1.1~7.
? : Level of importance (0=not, 3=very) Page 5 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.1.1 Editorial change for "frequencies" of voltages stressing insulation. 2.10.1.2 Editorial change for "pollution degrees" and better explanations for pollution degrees 1 and 2. 2.10.1.3 Editorial change for "functional insulation" and clarification of intention. 2.10.1.4 Editorial change for "intervening unconnected conductive parts". 2.10.1.5 Editorial change for "insulation with varying dimensions" (former subclause 2.10.10). 2.10.1.6 Modified last paragraph of former subclause 6.2.1 for "special separation requirements" of TNV circuits. 2.10.1.7 Added considerations for "insulation in circuits generating starting pulses": · Circuit complying with LCC: subclause 2.4 · Circuit not complying with LCC: subclause 2.10.3.5 2.10.2 Modified 2 Editorial changes for better readability and including requirements for circuits generating starting pulses. Introduction of subclauses 2.10.2.1~3. 2.10.2.1 · Adding new item "f)" defining the supply voltage for working voltage measurement · Changing text of item "g)" to cover the intention of OSM/EE decisions EA(GB)3/97 and EE(Chm)5/97 · Item "h)": assumption for working voltages of TNV circuits (part of old subclause 2.10.4) · Adding new item "i)" for discharge lamps: - Before lamp ignition: peak working voltage - After lamp ignition: rms working voltage 2.10.2.2 Rules for determining RMS WORKING VOLTAGE defined that are partly editorial (from old subclause 2.10.4) but appended by new "Note" for calculating the resultatnt r.m.s. value for a waveform having an a.c. r.m.s. voltage and a d.c. offset voltage. 2.10.2.3 Rules for determining PEAK WORKING VOLTAGE defined that are editorial (from old subclause 2.10.3.2). 2.10.3.1 Modified 1 Revising "General" clearance requirements and include detailed requirements for high altitude (table A.2 of IEC 60664-1, allowing linear interpolation). · Describing purpose of clearances in new first paragraph · Delete old Notes 1, 3 and 4 · Modifying text of "Note 2" and making it part of the standard text · Revising text of paragraph addressing clearances of switching devices for special consideration of interlock switches · Adding new Notes 1, 2 and 4 · New paragraph for clearances to BOUNDING SURFACES of connectors: - Reinforced insulation between BOUNDING SURFACES and connector parts at hazardous voltage - Exception: IEC 60083, IEC 60309, IEC 60906-1, IEC 60906-2 types - Exception: BASIC INSULATION for connectors that are fixed to EUT and internal to outer enclosure of EUT and only accessible after removal of user-replaceable subassembly that is required to be in place during normal operation · Added compliance criteria for equipment with ordinary non-detachable power supply cords · Moving standard text for force tests of compliance criteria to "Note 5" · Revising text of compliance criteria which states that clearances can be verified by electric strength test as stated in Footnote c) of Table 2M "peak working voltage in secondary circuit exceeding 1400 V" and in subclause 5.3.4 b) "functional insulation".
? : Level of importance (0=not, 3=very) Page 6 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.3.2 New 1 Introduction of concept of "mains transient voltages" for: · AC MAINS SUPPLY - MAINS TRANSIENT VOLTAGE depends on AC MAINS SUPPLY voltage and overvoltage category - Link to (new) Annex Z - New Table 2J for levels of transient voltages - Japan with increased requirements · Earthed DC MAINS SUPPLY - MAINS TRANSIENT VOLTAGE = 71 V peak · Unearthed DC MAINS SUPPLY - MAINS TRANSIENT VOLTAGE = same as for AC MAINS SUPPLY supplying the DC MAINS SUPPLY · Battery operation - MAINS TRANSIENT VOLTAGE = 71 V peak 2.10.3.3 Modified 2 Extended revision: · Clarification on how to use "additional clearances in primary circuits" table · Changed Table 2K (formerly Table 2H): - Delete column "Voltage r.m.s." and replace column "Voltage peak or d.c." with column "PEAK WORKING VOLTAGE" - Adding "if required by 5.3.4 c)" to FUNCTIONAL INSULATIO N - Linear interpolation is now permitted for all peak voltages exceeding the peak voltage of the AC MAINS SUPPLY - Adding remarks "a" to "c" for clarification · Changed Table 2L (formerly Table 2J): - Changed layout - Additional comment for clarification (when to apply table, linear interpolation) - Adding remarks "a" to "c" for clarification 2.10.3.4 Modified 1 Revision of requirements: · Adding procedure on how to determine the transient overvoltage for use in Table 2M "Minimum clearances in secondary circuits" · Change of Table 2M (formerly Table 2K): - Changed layout for remarks - Replace column "working voltage" with column "PEAK WORKING VOLTAGE" - Reduced requirements for FUNCTIONAL INSULATION - Introduction of transient voltage level "up to and including 71 V" - Adding "if required by 5.3.4 c)" to FUNCTIONAL INSULATIO N - Linear interpolation is now generally permitted - Clarification for test procedure for insulation material that is not Material Group I: bypassing of part of path along the surface of materials that are not of Material Group 1 - Added remarks "a" and "b" - Remark "c": Modified requirements for clearances for PEAK WORKING VOLTAGE exceeding 1400 V for d.c. test voltage 2.10.3.5 New 2 New subclause "clearances in circuits having starting pulses". Clearances are determined according to: · Annex G, or · Electric strength test: test voltage = 150% of PEAK WORKING VOLTAGE 2.10.3.6 New 1 New subclause "transients from an a.c. mains supply" Rules for MAINS TRANSIENT VOLTAGE determination in secondary circuits supplied by an AC MAINS SUPPLY. 2.10.3.7 New 1 New subclause "transients from a d.c. mains supply" Rules for MAINS TRANSIENT VOLTAGE determination in secondary circuits supplied by an DC MAINS SUPPLY.
? : Level of importance (0=not, 3=very) Page 7 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.3.8 New 1 New subclause "transients from telecommunication networks and cable distribution systems" · Rules for TELECOMMUNICATION NETWORK TRANSIENT VOLTAGE determination in secondary circuits connected to a TELECOMMUNICATION NETWORK · No consideration of transients for CABLE DISTRIBUTION SYSTEMS 2.10.3.9 Modified 0 Editorial changes of former subclause 2.10.3.4. 2.10.4 Modified 3 Introduction of subclauses 2.10.4.1~3. 2.10.4.1 Introduction of "General" creepage distance requirements and describing purpose of creepage distances. 2.10.4.2 Describing "material group and comparative tracking index", representing an editorial change only. 2.10.4.3 Revision of requirements: · New paragraph for creepage distances to BOUNDING SURFACES of connectors: - Reinforced insulation between BOUNDING SURFACES and connector parts at hazardous voltage - Exception: IEC 60083, IEC 60309, IEC 60906-1, IEC 60906-2 types - Exception: BASIC INSULATION for connectors that are fixed to EUT and internal to outer enclosure of EUT and only accessible after removal of user-replaceable subassembly that is required to be in place during normal operation · Change of Table 2N (formerly Table 2L): - Replace column "working voltage" with column "RMS WORKING VOLTAGE" - Reduced requirements fro printed boards (PCB) - Detailed distance requirements for RMS WORKING VOLTAGES exceeding 1000 V - Rules for REINFORCED INSULATIO N requirements moved from standard text to table - Added note for Material Group IIIb in Pollution Degree 3 and RMS WORKING VOLTAGE exceeding 630 V - Added remark "a" 2.10.5 Modified 0 Subclause changed: · Taken out: PCB (moved to subclause 2.10.6) · Added: semiconductor devices · More detailed: thin sheet materials, winding materials 2.10.5.1 New 0 Introduction of "General" requirements and describing application of solid insulation: · Requirements for enamel on wiring: subclause 2.10.5.13 · Requirements for PCBs: subclause 2.10.6 · Compliance criteria: - Inspection - Measurement (including Annex F) - Electric strength test - Additional tests of subclauses 2.10.5.4~14 2.10.5.2 Modified 3 For PEAK WORKING VOLTAGE exceeding 71 V SUPPLEMENTARY INSULATION and REINFORCED INSULATIO N shall be realized by a single layer of 0.4 mm distance through insulation. 2.10.5.3 New 0 New subclause "Insulating compound as solid insulation" which was partly covered by former subclause 2.10.8. Applicable to potting and encapsulation with reference to the new subclause 2.10.10.
? : Level of importance (0=not, 3=very) Page 8 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.5.4 New 3 New subclause "Semiconductor devices". Semiconductor devices providing SUPPLEMENTARY INSULATION and REINFORCED INSULATIO N are accepted without minimum distance through insulation, if: · Subclause 2.10.11 and ROUTINE TESTS for electric strength during manufacturing · Subclause 2.10.5.3 (which includes the test of subclause 2.10.10) Special case: optocouplers. Those shall comply with: · IEC 60747-5-5*, or · Subclause 2.10.5.3 (which includes the test of subclause 2.10.10) *: IEC 60747-5-5 is not published yet (stage "CDIS" on 28-Mar-2006) If the semiconductor devices contain cemented joints subclause 2.10.5.5 applies in addition. 2.10.5.5 New 3 New subclause "Cemented joints". Compliance criteria are: · Path between the conductive parts complies with CLEARANCE and CREEPAGE DISTANCE requirements for Pollution Degree 2, or · Path between the conductive parts complies with CLEARANCE and CREEPAGE DISTANCE requirements for Pollution Degree 1 and one sample passes test of subclause 2.10.10, or · Providing sufficient distance through insulation and three samples pass the test of subclause 2.10.11 PCBs do not have to be tested if: · "Pre-preg" material is used, and · Temperature of PCB is not exceeding 90 °C during heating test "Note 1" explains the purpose of this subclause, whereas, "Note 2" provides examples for cemented joints. 2.10.5.6 New 2 New subclause "Thin sheet materials - General" regulates the application of thin sheet material. Special consideration for SUPPLEMENTARY INSULATION and REINFORCED INSULATION: · Within equipment enclosure, and · Not subject to handling or abrasion during operator servicing, and · Meeting requirements of new subclauses 2.10.5.7 or 2.10.5.8 · It is now clarified that two or more layers can be separately applied at different parts 2.10.5.7 New 3 New subclause "Separable thin sheet materials" corresponds to former subclause 2.10.5.2. In addition the test of subclause 2.10.5.9 or 2.10.5.10 is required (with test voltages higher than those of IEC 60950-1:2001). 2.10.5.8 New 3 New subclause "Non-separable thin sheet materials". The test of: · Subclause 2.10.5.9 for SUPPLEMENTARY INSULATION or two layers of REINFORCED INSULATIO N · Annex AA is required for three or more layers of REINFORCED INSULATION (Test voltages higher than those of IEC 60950-1:2001) 2.10.5.9 New 3 New subclause "Thin sheet materials – standard test procedure". Test voltage: · Two layers used: 200% of the electric strength test voltage · Min. three layers used: 150% of the electric strength test voltage 2.10.5.10 New 0 New subclause "Thin sheet materials – alternative test procedure". Alternative test procedure only for tapes that can be separated for individual testing. This alternative test method corresponds to the test as described in former subclause 2.10.5.2.
? : Level of importance (0=not, 3=very) Page 9 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.5.11 New 0 New subclause "Insulation in wound components". Requirements are: · FUNCTIONAL INSULATION: no requirements. · BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED INSULATION: - Subclause 2.10.5.12 (or 2.10.5.13), or - Subclause 2.10.5.14, or - Combination of before stated subclauses · DOUBLE INSULATION: acceptable design is insulation according to subclause 2.10.5.12 for one wire and providing compliant insulation according to subclause 2.10.5.14 Furthermore, planar transformers are covered by subclause 2.10.6. 2.10.5.12 New 2 New subclause "Wire in wound components" applicable to wires providing BASIC INSULATION, SUPPLEMENTARY INSULATION and REINFORCED INSULATION. · Enamel: only accepted as insulation according to subclause 2.10.5.13 · For PEAK WORKING VOLTAGE not exceeding 71 V: no dimensional or constructional requirement for the wire used · For PEAK WORKING VOLTAGE exceeding 71 V: Comply with a), b) or c) a) BASIC INSULATION without stress: no requirements b) Other insulation: - Single layer with 0.4 mm thickness, or - Comply with subclause 2.10.5.6 and Annex U c) Other insulation: Comply with Annex U and minimum number of - One layer for BASIC INSULATION - Two layers for SUPPLEMENTARY INSULATION - Three layers for REINFORCED INSULATIO N · Requirements for spirally wrapped tape: - Shall be sealed and comply with subclause 2.10.5.5 - Less than 50% overlap: counts as one layer of insulation - More than 50% overlap: counts as two layers of insulation · Requirements for mechanical stress relief are not modified. 2.10.5.13 New 1 New subclause "Wire with solvent-based enamel in wound components" which permits enamel as electrical separation according to subclause 2.3.2.1 if following is fulfilled: · Insulation of all conductors shall be enamel complying with the requirements of grade 2 winding wire according to IEC 60317 (series) with a suitable test voltage, and · Electric strength test of the finished component (transformer), and · ROUTINE TEST of finished component at 1000 V · Additional requirements for Finland, Norway and Sweden Subclauses 2.10 and Annex G are not applying when checking for compliance with this subclause. Remark: However, external to the finished product (e.g. outside of transformer) requirements of subclause 2.10 (e.g. clearances and creepage distances) apply. 2.10.5.14 New 0 New subclause "Additional insulation in wound components" which applies rather to the component then to the wire: · Insulation between windings · Insulation between a wire and other conductive parts (e.g. core) Requirements are: · PEAK WORKING VOLTAGE not exceeding 71 V: no dimensional or constructional requirement for the wire used · For PEAK WORKING VOLTAGE exceeding 71 V: - BASIC INSULATION without stress: no requirements - SUPPLEMENTARY INSULATION or REINFORCED INSULATIO N: 0.4 mm thickness provided by a single layer, or comply with subclause 2.10.5.6 2.10.6 Modified 1 Modified to cover all types of printed boards. Introduction of subclauses 2.10.6.1~4. 2.10.6.1 New subclause "Uncoated printed boards" without new requirements.
? : Level of importance (0=not, 3=very) Page 10 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
2.10.6.2 Clarification of text of former subclause 2.10.6.1. Table 2Q (formerly Table 2N) with following changes: · Replace column "WORKING VOLTAGE" with column "PEAK WORKING VOLTAGE" with modified (and slightly increased) values · Linear interpolation is now generally permitted · Remark added which regulates the distance to be used if required creepage distance according to Table 2N is smaller than Table 2Q distance 2.10.6.3 New subclause "Insulation between conductors on the same inner surface of a printed board" which was discussed in subclause 2.10.5.3 in IEC 60950- 1:2001. However, stricter requirements due to compliance with the requirements for a cemented joint (subclause 2.10.5.5) necessary. 2.10.6.4 New subclause "Insulation between conductors on different surfaces of a printed board" which was discussed in subclause 2.10.5.3 in IEC 60950- 1:2001. Following was added: · Excluding FUNCTIONAL INSULATIO N and BASIC INSULATION from requirements · Adding "Note 2" for definition of "ceramic" 2.10.7 Modified 0 Text of former subclause 2.10.9 was modified to suit new subclauses concept in clause 2.10 but remains content wise the same. 2.10.8 Modified 0 New subclause "Tests on coated printed boards and coated components" 2.10.8.1 which corresponds in general to former subclauses 2.10.6.2~6. 2.10.8.2 2.10.8.3 2.10.8.4 2.10.9 New 0 New subclause "Thermal cycling". Test sequence was formerly described in subclause 2.10.6.3. 2.10.10 New 0 New subclause "Test for pollution degree 1 environment and for insulating compound". Test sequence was formerly described in subclauses 2.10.7 and 2.10.8. For clarification a note was added for conditions where the requirements of Pollution Degree 1 are the same as for Pollution Degree 2. 2.10.11 New 3 New subclause "Tests for semiconductor devices and cemented joints". New test procedure introduced which is important e.g. for optocouplers. 2.10.12 Modified 0 Text of former subclause 2.10.7 was modified to suit new subclauses concept in clause 2.10 but remains content wise the same.
3.1.9 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 3.2.1.1 Clarified 0 "Note" was added to rise awareness that many countries require by law a plug that complies with national wiring rules 3.2.3 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. Furthermore, "Note 1" was moved to Table 3A and "Note 2" was deleted. 3.2.4 Modified 0 "Note" added for Switzerland. 3.2.5.1 Clarified 0 "Note 2" modified: New Zealand added and content clarified. 3.2.6 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 3.3.5 Clarified 0 Clarification that this subclause applies to pillar, stud or screw type terminals. 3.3.6 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10.
? : Level of importance (0=not, 3=very) Page 11 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
3.4.2 Modified 1 · Contact separation requirement of 3 mm applies to equipment that is connected to: - AC MAINS SUPPLY of Overvoltage Categories I, II or III - DC MAINS SUPPLY at hazardous voltage · For DC MAINS SUPPLY not at hazardous voltage the separation requirement is reduced to the CLEARANCE for BASIC INSULATION · For DC MAINS SUPPLY not at hazardous voltage a removable fuse is a suitable disconnect device if it is only accessible to service persons · "Note" added which points out that additional measures might be necessary to prevent arcing in the disconnect device · If the disconnect device is part of the equipment is shall be located close to the incoming supply 3.4.6 Modified 0 Change of title to "Number of poles – single-phase and d.c. equipment". Editorial changes for better readability. 3.4.7 Modified 0 Change of title to "Number of poles – three-phase equipment". Replace at the end of the second paragraph "as part of the building installation" with "external to the equipment". 3.5.1 Modified 3 Adding a requirement for SELV CIRCUITS of data ports for connection to other equipment or accessories that those must comply with requirements of subclause 3.5.4. 3.5.4 New 3 · New subclause "Data ports for additional equipment" introduced which requires that the supply of SELV CIRCUITS of data ports shall comply with requirements of subclause 2.5 (LPS). · Excluded are ports for connection to equipment which is in compliance with requirements of subclause 4.7. · "Note" added describing fault current limits with 8 A, 100 VA. · Compliance criteria refer to inspection, and (if necessary) to test.
4.1 Modified 3 10° tilt test only applicable to equipment with mass of 7 kg or more. 4.2.1 Modified 0 · "Note" added which refer to certain types of optical drives (with rotational speed above 8000 r.p.m.) which may need sufficiently complete enclosures. · Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 4.2.5 Modified 1 Changed for following: · Bottom enclosures included if they can become a side or top enclosure during normal use · Exemptions were displayed in a list for better readability, STATIONARY EQUIPMENT and EQUIPMENT FOR BUILDING-IN were added 4.2.6 Modified 3 · Adding MOVABLE EQUIPMENT that requires lifting or handling by the user during normal use · Adding a "Note" which shows shredders as example · Defining a drop height of 750 mm for above described MOVABLE EQUIPMENT 4.2.7 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 4.2.8 Modified 1 · Replace the sample condition in first paragraph "equipment" with "enclosure with the cathode ray tube" · Specific reference to test standard: clause 18 of IEC 60065 · Adding "Note" providing details regarding the test standard 4.2.10 Modified 2 Compliance criteria extended by: · After the test, the equipment, including any associated mounting plate, shall not be damaged 4.3.4 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 4.3.6 Clarified 0 Simplified "Note 2" for UK.
? : Level of importance (0=not, 3=very) Page 12 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
4.3.8 Modified 3 · "Note 2" added for requirements for overcurrent protection · "Note 3" added for requirements for stationary batteries (reference to other standards) · Added requirements for operator-replaceable batteries: - Contacts that can not be shorted with the test finger - Be inherently protected · Additional requirement of a battery tray for equipment containing batteries with liquids or gel electrode. Exempted are sealed cell types that are valve-regulated (see new "Note 5"). Compliance is checked by inspection and evaluating manufacturer data. · Several editorial changes for tests for better readability. Changed and more detailed described test procedures for "overcharging of rechargeable battery". · In compliance criteria was added that there shall be no spillage of liquid unless contained by the equipment 4.3.10 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 4.3.13.4 Clarified 0 The location of the symbol or warning text for user access doors was clarified: · Beside a door or cover, or on the door if the door is secured 4.3.13.5 Modified 0 Reference to IEC 60825-12 "Safety of laser products – Part 12: Safety of free space optical communication systems used for transmission of information" was added for basis of labelling and classification. 4.5.1 Modified 3 · Editorial change by adding new subclause "General" · Audio amplifiers must be tested following subclause 4.3.4 of IEC 60065 4.5.2 Modified 0 · Editorial change by adding new subclause "Temperature tests" · Editorial changes for compliance criteria description including the deleted description for operating conditions 4.5.3 Modified 1 · Editorial change by adding new subclause "Temperature limits for materials" · Changes of Table 4B: - Changed concept: remarks relevant to Table 4B are added in table - Thermal classes description, see as well remark "c" of table - Revised maximum temperature for "rubber/PVC insulation with temperature marking" (see Corrigendum to IEC 60950-1:2001) - New remark "d" for "rubber/PVC insulation without temperature marking" 4.5.4 Modified 1 · Editorial change by adding new subclause "Touch temperature limits" · Adding Table 4C which corresponds to former Table 4B part 2 with following changes: - Changed concept: remarks relevant to Table 4C are added in table - Content of second dashed paragraph of remark "a" describing conditions and required markings for hot conditions in operator access areas (example: laminators) 4.5.5 Modified 2 Revised test temperature (see already in Corrigendum to IEC 60950- 1:2001). 4.6 Clarified 0 Editorial change by adding "Note 2" for clarification and placing text into subclauses 4.6.1 and 4.6.2. 4.6.1 Modified 0 Editorial change by adding text of former subclause 4.6.1 (testing in each appropriate orientation of intended use). 4.6.2 Modified 0 · Editorial change by adding text of former subclause 4.6.1 (testing in each appropriate orientation of intended use) · Clarification that TRANSPORTABLE EQUIPMENT is exempted from this subclause · Clarification of requirements for STATIONARY EQUIPMENT · Needle flame test reference changed from IEC 60695-2-2 to IEC 60695-11-5
? : Level of importance (0=not, 3=very) Page 13 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
4.6.4 Modified 2 Modified by adding alternative opening designs in TRANSPORTABLE EQUIPMENT. Introduction of subclauses 4.6.4.1~3. Furthermore: · Excluding bare conductive parts from this subclause if power between those is limited (LPS) and not covered by subclause 4.6.4.3 · Adding "Note" defining conductive parts with conformal* or other coatings as not-bare conductive parts *: "Conformal coating": An insulating protective covering that conforms to the configuration of the objects coated (typically printed circuit boards, printed board assembly) providing a barrier against environmental conditions 4.6.4.1 New subclause "Constructional design measures" with following changes: · Allowing other "equivalent" constructional means · Adding "Note" to clarify that screens may have to comply in addition with requirements of subclause 4.7 4.6.4.2 New subclause "Evaluation measures for larger openings". Larger openings than those specified in subclause 4.6.4.1 are allowed after simulation of faults between all bare conductive parts located less than 13 mm away from each other in all areas within the EUT that do not meet the requirements of subclause 4.6.4.1. · Compliance is verified by inspection, measurement and testing · Compliance criteria: no emission of molten metal, no ignition of non- metallic materials 4.6.4.3 New subclause "Use of metallized parts" which is content-wise identical to former clause 4.6.4. 4.7 Modified 0 "Note 4" added informing that in Australia and New Zealand alternative tests are permitted. 4.7.2.2 Modified 0 Replacing in exemption list the material "neoprene" with "polychloroprene". This is editorial only (Neoprene is the DuPont Chemical trade name for a family of synthetic rubbers based on polychloroprene). 4.7.3.3 Modified 0 Editorial changes for displaying requirements for materials outside fire enclosures and for material "neoprene" (see above). 4.7.3.4 Modified 0 Editorial change for material "neoprene" (see above). 4.7.3.5 Modified 0 Editorial changes for displaying requirements for materials of air filter assemblies and deletion of former fourth dashed paragraph due to obsolete after change. 4.7.3.6 Modified 0 Needle flame test reference changed from IEC 60695-2-2 to IEC 60695-11-5 (including mentioned subclause changes within this standard). Same for reference in Table 4E in row "High voltage (>4 kV) components 4.7.3.6".
5.1.1 Modified 1 · Change in list of exempted equipment for tests of subclauses 5.1.5, 5.1.6, 5.1.7.1 a): STATIONARY PERMANENTLY CONNECTED EQUIPMENT and STATIONARY PLUGGABLE EQUIPMENT TYPE B ("STATIONARY " added) · Adding "Note" that subclause 5.1.7.1 b) applies as well for exempted equipment (see above) 5.1.2 Modified 1 Modified by introducing subclauses 5.1.2.1~3. 5.1.2.1 New subclause "Single connection to an a.c. mains supply" which is content- wise identical to former clause 5.1.2. 5.1.2.2 New subclause "Redundant multiple connections to an a.c. mains supply" which is content-wise identical to former clause 5.1.2, however modified for clarification only. 5.1.2.3 New subclause "Simultaneous multiple connections to an a.c. mains supply": · Modified for clarification · Test instruction for EUT with PE conductor that is not connected to other earthed parts within the EUT 5.1.3 Clarified 0 · Clarification of test procedure if transformer T is not used: EUT and test circuitry shall not be earthed · Clarification that equipment tested for IT power distribution system can be used in TN/TT without further test
? : Level of importance (0=not, 3=very) Page 14 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
5.1.6 Modified 0 · Clarification of compliance criteria: limits of subclause 5.1.6 can be exceeded if allowed by subclause 2.4 · Adding remark "b" in Table 5A addressing limits of unearthed accessible parts 5.1.7 Modified 1 Modified by introducing subclauses 5.1.7.1~2. 5.1.7.1 New subclause "General" adding conditions for which PLUGGABLE EQUIPMENT TYPE A can have touch currents exceeding 3.5 mA: · STATIONARY PLUGGABLE EQUIPMENT TYPE A with single AC MAINS CONNECTION: separate PE terminal plus statement in the installation instructions; "Note 1" added in standard for clarification · STATIONARY PLUGGABLE EQUIPMENT TYPE A with multiple AC MAINS CONNECTION: separate PE terminal plus detailed statements in the installation instructions · MOVABLE/STATIONARY PLUGGABLE EQUIPMENT TYPE A for use in RESTRICTED ACCESS LOCATIONS: single AC MAINS CONNECTION, separate PE terminal plus statement in the installation instructions; "Note 2" added in standard for clarification
"Notes 3 and 4" added to limit exempted equipment for Denmark, Finland, Norway and Sweden.
Deleted second dashed paragraph of former subclause 5.1.7 (size of protective bonding conductor) plus deleted "Note" beneath warning text. 5.1.7.2 New subclause "Simultaneous multiple connections to the supply" with new testing procedure: · Test is repeated with each AC MAINS SUPPLY connected one at a time with the other mains supply/supplies disconnected · "Note" added which clarifies that a malfunction of the equipment during this test is acceptable · Compliance criteria of subclause 5.1.7.1 a) shall be taken 5.2.2 Modified 2 Various changes: · Changed layout for improved readability · Former "Note 1" became standard text (modified test duration during ROUTINE TESTS) · New Table 5C "Test voltages for electric strength tests based on required withstand voltages" used in Annex G · Adding "Note 1" clarifying that special test procedures as required in certain subclauses cannot be replaced by test of this subclause · Adding "Note 2" for reference to IEC 60664-1 · Choice of tables for verification:
Environment Table 5B Table 5C Overvoltage Category I x x Overvoltage Category II x x Overvoltage Category III x Overvoltage Category IV x Secondary without connection to earth x
· Table 5B with changed WORKING VOLTAGE ranges: - £210 V (before: 184 V) - 210 V – 420 V (before: 184 V – 354 V) - 420 V – 1.41 kV (before: 354 V – 1.41 kV) 5.3.4 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 5.3.6 New 3 Audio amplifiers must be tested following subclauses 4.3.4 and 4.3.5 of IEC 60065.
? : Level of importance (0=not, 3=very) Page 15 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
5.3.7 Modified 1 · "Note 1" added describing that - different conditions for overloading - other fault conditions for internal circuit connections apply · List of faults extended by "e)": general reference to subclause 1.4.14 for "other single faults" · Subclause 5.3.4 b) added as second exemption option for components in primary circuits associated with the mains input 5.3.8 Modified 0 Editorial changes for changed operating conditions (deleted "SHORT-TIME or INTERMITTENT OPERATION). 5.3.9.1 Modified 3 · Annex G was introduced as alternative to compliance with CREEPAGE DISTANCES of clause 2.10.3. · Table 5D "Temperature limits for overload conditions" added (with limits for thermal classes corresponding to those of Table C.1 for "protection by inherent or external impedance") · Limits of Table 5D apply during: - Short-circuit of all relevant components - Disconnection of all relevant components - Overloading of all relevant components 5.3.9.2 Modified 0 Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10.
6 Modified 0 "Note 5" added for additional requirements in Canada and USA. 6.1.2.1 Modified 2 · Detailed requirements for rated operating voltages of surge suppressors bridging insulation (requiring detailed information from the component manufacturer); "Note 1" added for clarification · Clarification of compliance criteria for application of surge suppressors: dimensional and constructional requirements of subclause 2.10 and Annex G do not apply for compliance with subclause 6.1.2 · Change of test procedure description to address different regions (with examples Europe and North-America) 6.2.1 Modified 3 · Example list of "a)" extended by "the entire exterior surface of a laptop or notebook computer". · Annex G was introduced in compliance criteria and "Note" as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. 6.2.2.1 Modified 0 Editorial change related to change of Annex N.
7.1 Modified 0 New subclause 7.1 "General" introduced which contains text of former clause 7 plus new "Note 1" which states that clause 7 only applies to CABLE DISTRIBUTION SYSTEMS using coaxial cable. For other types clause 6 applies. 7.3 Modified 3 Exemption criteria for omitting separation between OPERATOR ACCESS AREA and CABLE DISTRIBUTION SYSTEM: · Circuit under consideration is TNV-1 circuit, and · Common/earthed side of the circuit is connected to the screen of the coaxial cable and to all accessible parts and circuits, and · Screen of the coaxial cable is intended to be eathed in the building installation "Notes 1 and 2" added for special considerations within Norway and Sweden. 7.4.2 Modified 1 · Change of test procedure: all components connected between the connection points for the CABLE DISTRIBUTION SYSTEM and the main protective earthing terminal are disconnected before the test. · Editorial change of display of test procedure for improved readability. · Editorial change related to change of Annex N. 7.4.3 Modified 1 · Change of test procedure: all components connected between the connection points for the CABLE DISTRIBUTION SYSTEM and the main protective earthing terminal are disconnected before the test. · Editorial change of display of test procedure for improved readability. · Editorial change related to change of Annex N.
? : Level of importance (0=not, 3=very) Page 16 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
A.1.5 Modified 1 Change of test procedure: in last sentence of first paragraph replace "repeated until" with "repeated, whether or not the sample is flaming, until". A.2.5 Modified 1 Change of test procedure: in last sentence of second paragraph replace "repeated until" with "repeated, whether or not the sample is flaming, until".
B.3 Modified 1 Table B.1 was modified: - Introduction of numeric thermal classes - Increased limits for former classes F and H - Adding of thermal classes of higher temperatures - Adding a remark to link numerical and alphabetic class designations B.4 Modified 1 Table B.2 was modified: - Introduction of numeric thermal classes - Increased limits for former classes F and H - Adding of thermal classes of higher temperatures - Adding a remark to link numerical and alphabetic class designations B.6 Modified 2 Modified by introducing subclauses B.6.1~4. B.6.1 New subclause B.6.1 "General" which is content-wise covered by former clause B.6. B.6.2 New subclause B.6.2 "Test procedure" which is content-wise covered by former clause B.6. B.6.3 New subclause B.6.3 "Alternative test procedure" which is content -wise covered by former clause B.6. B.6.4 New subclause B.6.4 "Electric strength test" with new test procedure for motors with voltages exceeding SELV limits. B.7.1 New 0 New subclause B.7.1 "General" which is content-wise covered by former clause B.7. B.7.3 Modified 0 "Note" of former subclause B.7.2 deleted due to CHEESECLOTH introduced as defined term.
C.1 Modified 2 · If transformers are tested at Tamb < Tma and the measured temperature exceeds 180 °C the test must be performed again at Tamb=Tma. The "Note" explains the reason. · Table C.1 was modified: - Introduction of numeric thermal classes - Increased limits for former classes F and H - Adding of thermal classes of higher temperatures - Adding a remark to link numerical and alphabetic class designations C.2 Modified 1 · Annex G was introduced as alternative to compliance with CLEARANCE and CREEPAGE DISTANCES of clause 2.10. · Former "Note" became standard text. · Deleted paragraph above former "Note" dealing with designs exempted from electric strength tests.
F Modified 3 · Changed Figure F.12: modified point for CLEARANCE measurement · New Figure F.14 "Solid insulating material" · New Figure F.15 "Thin sheet insulating material" · New Figure F.16 "Cemented joints in multi-layer printed boards" · New Figure F.17 "Component filled with insulating compound" · New Figure F.18 "Partitioned bobbin"
G.1 Modified 0 Modified by introducing subclauses G.1.1~2. G.1.1 New subclause G.1.1 "General": · Describing design principles of clearances related to exposure to overvoltages. · Describing the nature of Annex G as an alternative to the requirements of subclause 2.10.3 for Overvoltage Categories I and II. · Describing in the "Note" good design practice for SOLID INSULATION. G.1.2 New subclause G.1.2 "Summary of the procedure for determining minimum clearances" which is content-wise covered by former clause G.1 and only updated for changes within other subclauses of Annex G. G.2.1 Modified 0 · "Note 1" added with reference to new Annex Z. · Placing second paragraph in a modified way into new subclause
? : Level of importance (0=not, 3=very) Page 17 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
G.1.1. · Simplifying third paragraph. · Change of Table G.1: - Adding remark "a" for three-phase/three-wire supplied equipment - adding remark "b" clarifying that interpolation is not permitted · Deleting former "Note 1" (special consideration for Norway). G.2.2 Modified 1 Covering only "eathed" DC MAINS SUPPLIES. MAINS TRANSIENT VOLTAGE is increased from 0 V to 71 V peak. G.2.3 New 0 New subclause "Unearthed d.c. mains supplies" which is content-wise covered by second paragraph of former subclause G.2.2. G.2.4 New 1 New subclause "Battery operation" with MAINS TRANSIENT VOLTAGE considered as 71 V peak. G.3 Modified 0 Clarification for cases where the TELECOMMUNICATION NETWORK TRANSIENT VOLTAGE is known. G.4 Modified 1 Modified by introducing subclauses G.4.1~4. G.4.1 New subclause G.4.1 "Mains transients and internal repetitive peaks". Following applies: · Major editorial change for improved readability, however, content-wise covered by former subclause G.4 a). · Cases "a2)" and "b2)" were covered by third dashed paragraph of former subclause G.4 a). · Case "c)" is added for secondary circuits supplied from a DC MAINS SUPPLY. G.4.2 New subclause G.4.2 "Transients from telecommunication networks" which is content-wise covered by former subclause G.4 b). G.4.3 New subclause G.4.3 "Combination of transients" which is content-wise covered by former subclause G.4 c). G.4.4 New subclause G.4.4 "Transients from cable distribution systems" which is content-wise covered by former subclause G.4 d). G.5 Modified 1 · Cases for which no tests are necessary are extended by situations where subclauses G.2.2 (earthed dc mains supply) and G.2.4 (battery operation) apply. · Test procedure for transient measurement for a DC MAINS SUPPLY introduced.
? : Level of importance (0=not, 3=very) Page 18 of 20 Document date: 3-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
G.6 Modified 1 · Providing details on how to use IEC 60664-1 for equipment operated at altitudes exceeding 2000 m above sea level (covered already by the Corrigendum to IEC 60950-1:2001). · New paragraph for clearances to BOUNDING SURFACES of connectors: - Reinforced insulation between BOUNDING SURFACES and connector parts at hazardous voltage - Exception: BASIC INSULATION for connectors that are fixed to EUT and internal to outer enclosure of EUT and only accessible after removal of user-replaceable subassembly that is required to be in place during normal operation - "Note 2" added to clarify the test procedure for connectors of above described "exception". · No requirements of minimum clearances for connector that comply with IEC 60083, IEC 60309, IEC 60906-1, IEC 60906-2. · Changed Table G.2: - Introducing different requirements for different pollution degrees - Increased requirements for pollution degrees 2 and 3 - Changed remark "3)" of former Table G.2 with increased d.c. test voltage value - Adding remark "a" for clarifying application of FUNCTIONAL INSULATION - Adding remark "b" for clarifying application of pollution degree 1 · New test procedure requirement for equipment with ordinary NON- DETACHABLE POWER SUPPLY CORDS · Standard text of second last dashed paragraph moved to new "Note 3" · Clarification of test point for clearances related to the changed Figure F.12 · Correction of statement that a verification of clearances with an electric strength test is necessary if minimum clearance of 5 mm of Table G.2 is used for secondary circuits.
H Modified 0 Change of referenced standard in "Note 1".
M.3.1.3 Modified 1 Increased limit voltage of "quiet intervals" of ringing signals: 60 V d.c. (before: 56.5 V d.c.). M.3.2.1 Modified 0 · "Note 1" added for giving examples of tripping devices. · "Note 2" added for giving advice on saving testing time. M.3.2.3 Modified 1 Increased limit voltage during "idle state" of ringing signals: 60 V d.c. (before: 56.5 V d.c.).
N.1 Modified 0 Change of referenced standard in second and third paragraph (ITU-T Recommendation K.44, before: ITU-T Recommendation K.17). N.2 Modified 1 Table N.1 changed: · C2 rating for circuit "Reference 2" · Reference to linked subclauses updated (column "See")
P Modified 3 · Added information (internet addresses) for obtaining reference documents · Standards with newer dates: IEC 60065, IEC 60085, IEC 60364-1, ISO 7000-DB · Standards where that dated reference was deleted: IEC 60073, IEC 60083, IEC 60112, IEC 60216-4-1, IEC 60317, IEC 60317-43, IEC 60695-2-11/-20, IEC 60695-10-2, IEC 60695-11-3/ -4/-10/-20, IEC 60825-1/-2, ISO 178, ISO 180, ISO 261, ISO 262, ISO 3864, ISO 8256, ISO 9772, ISO 9773 · Standards where that dated reference was added: IEC 60417-DB, · Standards added: IEC 60068-2-78, A1 and A2 of IEC 60664-1, IEC 60695-11-5, A1 of IEC 60730-1, IEC 60747-5-5 (not published yet), IEC 60825-9/-12, A1 of IEC 60851-3, A1 and A2 of IEC 60851-5, IEC 60906-1/-2, IEC 60947-1, IEC 61051-2 · Changes for standards covered: ISO 4892-1/-2/-4, ITU-T Recommendation K.44
? : Level of importance (0=not, 3=very) Page 19 of 20 Document date: 4-Apr-2006 Differences between "IEC 60950-1:2001" and "IEC 60950-1:2005"
Subclause Change ? Comment
Q New 2 Former Annex Q "Bibliography" moved to the end of the standard. New normative Annex Q "Voltage depended resistors (VDRs)" provides details of test conditions applicable during the IEC 61051-2 approval process.
T Modified 0 Dated reference was deleted for IEC 60529.
U.2.1 Modified 0 Dated reference was deleted for IEC 60851-5. U.2.2 Modified 0 Dated reference was deleted for IEC 60851-3. U.2.3 Modified 0 · Dated reference was deleted for IEC 60851-6. · Table U.2 was changed: - Changed thermal classes (numeric designation) - Increased oven temperature for former classes F and H U.2.4 Modified 0 Dated reference was deleted for IEC 60851-5 in "Note". U.3.1 Modified 1 Deletion of peak voltages for testing. U.3.2 Modified 1 Deletion of peak voltages for testing.
V.1 Modified 0 Change of reference from "IEC 60364-3" to "3.1.2 of IEC 60384-1".
X.2 Modified 0 Editorial change for improved readability.
Z New 0 New informative Annex Z "Overvoltage categories" providing details from IEC 60664-1 regarding overvoltage categories and how assigning them to circuits.
AA New 2 New normative Annex AA "Mandrel test" which is required in some conditions in subclause 2.10.5.8 (testing of non-separable thin sheet material, three or more layers providing REINFORCED INSULATION).
BB New 0 New informative Annex BB "Changes in the second edition". BB.1 New 0 New subclause BB.1 "Numbering changes table" providing a very simple overview about the clauses and the actions taken during the edition change. BB.2 New 0 New subclause BB.2 "Changes to this edition" providing a simple overview about the principal changes but not listing minor changes or any details.
Bibliography 0 Former Annex Q "Bibliography" moved to the end of the standard.
? : Level of importance (0=not, 3=very) Page 20 of 20 Document date: 3-Apr-2006