The great majority of mains voltage circuits do need a CPC, but yes there are exceptions.
And of course the great majority of installation cables include a CPC.
I have previously installed two very short circuits without a CPC. The application was a transportable toilet and shower unit. Three phase 32 amp supply via a ceeform inlet. 30ma RCD.
I removed the mains voltage lights as these often tripped the RCD. Instead I fitted two all insulated fused connection units, each of these supplied a 12 volt DC 60 watt all insulated SMPSU. Two circuits each supplying all insulated bulkhead lights with 12 volt CFLs.
It "felt wrong" not to run a CPC to the fused connection units, but was in my view acceptable in the circumstances.
The great majority of mains voltage circuits do need a CPC, but yes there are exceptions.
And of course the great majority of installation cables include a CPC.
I have previously installed two very short circuits without a CPC. The application was a transportable toilet and shower unit. Three phase 32 amp supply via a ceeform inlet. 30ma RCD.
I removed the mains voltage lights as these often tripped the RCD. Instead I fitted two all insulated fused connection units, each of these supplied a 12 volt DC 60 watt all insulated SMPSU. Two circuits each supplying all insulated bulkhead lights with 12 volt CFLs.
It "felt wrong" not to run a CPC to the fused connection units, but was in my view acceptable in the circumstances.
