David King asks about whether, in a domestic electrical installation, he needs to fit one double-pole isolator for the two consumer unit arrangement. His question has been answered by the NICEIC (Theme – Distribution Equipment):
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Question: In a domestic dwelling, there are two new consumer units installed. One is for the existing house and one is for an extension to the house. Both are fed from a 100A connector block from the cutout.
Do I need to install one double-pole isolator for the consumer units, or can I install labels stating isolation of both supplies.
Answer: There are means of isolation on each consumer unit, and that is compliant with the requirements of BS7671:2008.
There is no formal requirement to have to install one switch in place for both units.
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