C
Cirrus
If installing a shower, is it compulsory to run a 4mm earth from lighting point to the shower? Obviously the shower circuit will have a 4mm cpc (10mm t&e). I understand that in an ideal world all extraneous conductive parts need to be bonded such as pipes but let's say that is all done and it is just a case of installing a new shower, is it necessary to take a 4mm to shower from light?