Discuss 4mm cable into the bottom of main switch. in the Electrical Forum area at ElectriciansForums.net

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Steve93

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Eicr today had a 4mm T+E connected into the bottom of a main switch which went to a separate dB with 1 20amp rcbo. Then swa to a hot tub. That part is fine. What I’m unsure about is the reg I can say that the cables are not ok in the bottom of the main switch. The other dB is only about a ft away from the main one. What’s people’s thoughts on this? I know it’s rough as you like!!
 
I assume the OP is referring to a standard 100a MS in a DB with a busbar and N link in the bottom
If that is the case you must question whether this is a means of connection which is condoned by the consumer unit manufacturer. Are the conductors suitably sized to withstand fault and short circuit current.
 
If that is the case you must question whether this is a means of connection which is condoned by the consumer unit manufacturer. Are the conductors suitably sized to withstand fault and short circuit current.

Not using a type tested assembly as intended by the manufacturer.

C2, as it could cause poor connection and possible CU fire. Bit of a judgement call.
 
[QUOTE - So the 4mm is protected by the cut out fuse?]

For fault current yep but depends on what type supply

[QUOTE So by the cut out fuse then?
What other ocpd is there?]

What over current can the 4mm suffer when it can pull no more than 20 amp?
 

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