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.
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.
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