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Differences IEC 60950-1 1St And

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Differences IEC 60950-1 1St And 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.
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