Issued November 1996 10544

RCD POD Instruction Leaflet

RS stock no. 222-5762 , 222-5778

Important Notes ● If the RCBO has a rated residual current of 30mA or less and This product should be installed, commissioned and maintained operates in less than 40ms at 150mA it may be used to by, or under the supervision of a competent in lessen the risk of direct contact ensuing from the failure of accordance with the current electrical engineering Codes of other measures e.g. damaged insulation (note to Cl. 412-06- Practice IEE Regulations for the of 02) Buildings (BS 7671), Statutory requirements and any specific instruction issued by the Company. D.C. Components in the Load After completing and testing of the installation this leaflet must The RCBO is capable of responding to the superimposition of be given to the person responsible for it’s future operation and components of current on the supply caused by the operation of maintenance and must be kept available for reference at all equipment using rectified voltages in compliance with BSEN times. 61009. These notes assume throughout that the product is disconnected from the supply. It is essential that this is done Standing Earth Leakage before any work is carried out. The RCBO will not operate for values of earth leakage on the circuit up to 50% of the rated residual operating current (IÆn) on General Description normal 50Hz supplies; to avoid nuisance tripping the installer This unit combines the current protection of an MCB with an should establish the standing value where possible. If the RCBO electronic RCD capable of high sensitivity operation with is fitted into a position already fed by a RCD, special special fail-safe features. The unit is ready for installation in SPN consideration may have to be given to ensure discrimination. (type A) or TPN (type B) distribution boards operating on 240/415V systems. The Unit occupies one sub-circuit way of the Loss of Supply Neutral distribution board and provides single phase protection against Under loss of supply conditions the RCD element of the device overload, short circuit and earth leakage currents. will continue to provide earth leakage protection. With these conditions and upon detection of an earth leakage current the Overcurrent Protection RCBO will operate within its normal characteristics. Overcurrent protection to circuit conductors is provided by thermal and magnetic tripping elements in the MCB which has High Voltage Suppression an M10 rating (up to 10kA breaking capacity). This section of the High voltage suppression is incorporated and the unit is RCBO complies with the requirements of BSEN 61009 and BSEN therefore ideal for use with supply equipment susceptible to 60947-2 such mains borne transients. Earth Fault Protection Installation The RCD element of the device provides core balance detection ● Fit RCBO unit into distribution board and fully tighten of the difference between live and neutral currents and connection screw. amplification to provide high sensitivity. The nominal level of Note:The flying leads are of limited length therefore on TPN tripping under earth leakage conditions is referred to as the (type B) boards the RCBO must be positioned within rated residual operating current (IÆn) and the speed of reach of the neutral and earth terminal blocks. operation at this level is typically less than 300ms. Thus the unit ● Connect the black flying neutral lead to the neutral terminal is suitable for protection against indirect contact as defined by the Wiring Regulations: block ● In TN and TT systems the product of the earth fault loop Note:If the neutral wire is trimmed to length, a ferrule should be used to terminate the cable and ensure impedance and the rated residual operating current shall captivation of all strands. not exceed 50V (Cl. 413-02-17). ● Connect the white flying earth lead to the earth terminal ● In a TT system every socket outlet in a household or similar block. installation shall be protected by such a device with a ● The load connections are made to the outgoing terminals of related residual current not exceeding 30mA (Cl. 471- 08-01). the unit marked ‘L LOAD’ and ‘N LOAD’. ● An RCBO having a rated residual current of 30mA or less Note:The neutral of the load must not be connected to the neutral terminal block. shall be used where equipment is supplied from a socket ● outlet rated at 32A or less via a flexible cable and the The neutral must not be used as a protective earthed neutral equipment is intended to be used outside the zone created (PEN) conductor on the load side of the MCB/RCD unit. ● by the main equipment bonding (e.g. gardening The installation and appliances connected to the system equipment. hand lamps and tools used outdoors) (Cl. must be adequately earthed in accordance with IEE 471-16-02). regulations. 10544

● The maximum permissible earth loop impedance which Operation of the Test Button will satisfy the requirements of the latest edition of the This check is made after installation with all shields and covers wiring regulations (BS 7671) in place and requires the RCB0 and the main Supply to be switched on. Pressing the button marked ‘T’on the RCBO 50 applies a simulated earth fault to the RCBO which should trip —- (=1667 ohms where IÆn=30mA) instantly. This check should be carried out at least quarterly - if IÆn the RCBO fails to trip seek expert advice. Note: operation of the test device checks only the correct functioning of the RCBO at a Recommended RCBO terminal screw tightening torque 1.8NM higher current than the rated tripping level. This test does not check the integrity of the . After installation check the operation of the unit as specified in the IEE Wiring Regulations, Part 7. Since this will require the unit to be energised, all shields and covers must be replaced before performing these tests.

The information provided in RS instruction leaflet is believed to be accurate and reliable; however, RS Components assumes no responsibility for inaccuracies or omissions, or for the use of this information, and all use of such information shall be entirely at the user’s own risk. No responsibility is assumed by RS Components for any infringements of patents or other rights of third parties which may result from its use. Specifications shown in RS Components instruction leaflets are subject to change without notice.

RS Components, PO Box 99, Corby, Northants, NN17 9RS Telephone: 01536 201234 An Electrocomponents Company © RS Components 1996