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Thanks for pointing out. Odd no one quoted 537.1.6 Where an installation is supplied from more than one source, a main switch shall be provided for each source of supply and a durable warning notice shall be permanently fixed in such a position that any person seeking to operate any of these main switches will be warned of the need to operate all such Switches to achieve isolation of the installation. Alternatively. a suitable interlock system shall be provided. (See also Regulation 514.15.1.)The post you are replying to is over a year old
But I suppose it was just as BS7671:2008 was first active and at that time we would have all been studying hard!