wiring up door bell to CU


I want to run a supply cable from an MCB on my consumer unit to a bell trans. Is it in order to flip the CU 2 main switches to off then remove the cover and connect up with care? The only way to isolate it is to pull the company fuse otherwise. Similarly I want to power a couple of smoke/heat detectors but from another CU.
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Hi You say 2 main switches. This sounds like a split board (one side with RCD protection and the other without).These boards are the norn' now and providing you connect to the right neutral bar you should have no problems . These units have busbar covers protecting the live incommers so turning of the main breakers will make the board safe enough to work on. I would recomend you put local isolation in the form of a fused spur with 1a fuse near the transformer if it is more than 3ft from the consumer unit.
HTH CJ
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Thanks CJ! The trans is right by the CU (yes split load) so I'll cable it direct then.
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