A contractor has provided the single-phase electrical installation in 12 new, very small, individual commercial units. For whatever reason he provided two 6way distribution boards one appears to be for lighting and the like and the other for power, both with 30mA overall RCD protections both boards have a main switch. The tails for both boards are brought to a set of ISCOs from which he left a short tail connection for the meter. Now 4 of the units have been connected to the supply but apparently connection is being refused to the remaining units as no main switch has been provided. I guess different DNOs, different rules and indeed attitudes but I can find no reference to the need for a main switch in the DNO connection guide other than that the installation has to comply with 7671.
It's getting away from the OP, but what about the supplier's isolator? (Oh, the grief that that caused me!)
Hi Chis, what grief was caused? I really like good chunky Omni pole isolator that has been made available to connect a BS7671 compliant installation to, where the supply side is sealed and the outgoing side not. Does removing the suppliers fuse to isolate the main incoming terminals of a standard Consumer unit comply with BS7671?
It's getting away from the OP, but what about the supplier's isolator? (Oh, the grief that that caused me!)
Hi Chis, what grief was caused? I really like good chunky Omni pole isolator that has been made available to connect a BS7671 compliant installation to, where the supply side is sealed and the outgoing side not. Does removing the suppliers fuse to isolate the main incoming terminals of a standard Consumer unit comply with BS7671?
Having put in my own isolator, I really didn't want another one in series with it. I got my own way in the end, and compensation from the Ombudsman.
Crazy having 2 small boards, must have got them for free.
In some circumstances there can be a requirement to be able to meter lighting and power loads separately (for local energy management purposes, not supplier billing) - so several separate boards might not be such a silly idea.
