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OVERVOLTAGE PROTECTION TECHNICAL


Figure 2 CIRCUIT DETAILS Wiring details No. Circuit description No. of points


Type (see code below) Ref. method


1L1 1L2 1L3 2L1 2L2 2L3


Lift supply Lift supply Lift supply Type 2 SPD Type 2 SPD Type 2 SPD


>>> Continued from page 37


The presence of an SPD installed in a distribution board, as shown in Figure 2, above, should be identified in the circuit description section of the circuit chart schedule of test results and the position of this should correspond to the circuit way that has been allocated to it in the DB, e.g. Circuit No 1L1,1L2,1L3 or 2L1, 2L2,2L3.


Domestic consumer units In domestic consumer units (CUs) an SPD will typically be rated for a 100A supply, in which case fault protection will be provided by the DNO cut out fuse and not provided by a separate OCPD in the CU. It will however be located close to the CU’s main switch or switch disconnector


1 1 1 1 1 1


D D D D D D


B B B B B B


16 16 16 16 16 16


as it provides protection for all connected final circuits. The presence of the SPD can therefore again easily be identified in the circuit description section of the circuit chart schedule of test results. However, for clarity it may be preferable not to allocate a circuit number to it as shown in Figure 3 on the top of the opposite page. Regarding recording the outcome of an inspection of an SPD, there is unfortunately no item provided for this in the current Schedule of inspection given in Appendix 6 for ‘Domestic and similar premises with up to 100A supply’. However, the inspection of SPDs is mentioned in the ‘Examples of items requiring inspection during initial verification’ which is a simple checklist also provided in Appendix 6 to aid the


CIRCUIT DETAILS Wiring details No.


Circuit description


No. of points


Type (see code below)


Ref. method


Conductor csa


mm2 Live 1 Shower 1 A


Figure 4 38 CABLEtalk AUGUST/SEPTEMBER 2021


101 10 cpc 4 B 40 Protective


device (Lowest breaking


capacity = 6kA) Type Amps (R1 0.1 (R1 + R2 + R2


or R2 Ω )


) Continuity Ring final circuit Ω R₂ L-L N-N cpc-cpc


Conductor csa mm2


Live


16 16 16 16 16 16


cpc


C C C C C C


63 63 63 63 63 63


inspector carrying out an inspection. Recording the outcome is probably not strictly necessary and if a record of inspection is required or requested by the client it may be necessary to identify this in a separate attachment to the schedule of inspections. Where overvoltage protection is


not installed it may also be necessary to record this and it may be appropriate to insert a comment to this effect, perhaps in the ‘Remarks’ column of the circuit chart schedule of test results as shown in Figure 4 (shown below). Similarly, where a Type 3 SPD is to be installed, e.g. to protect an item of IT equipment, the device will be located at the end of the final circuit supplying the equipment. Therefore, it is also appropriate to record this information in the ‘Remarks’ column in the relevant row,


Protective device (Lowest breaking capacity .......10... (kA)


Type Amps


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