OP
MDJ
Also good practise IMO, local isolation for a moving part, maybe not regs, not sure about that will have to check, but in anycase good practise
Discuss Smoke alarm 3rd core, WHY ? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
No......you need to go from the switch to a TP fan isolator then the fan.
Common - perm live at fan isolator (brown)
S/L - S/L at fan isolator (black....remember to sleeve)
Neutral - Neutral (gray......remember to sleeve)
Then wire from the isolator to the fan!
Failing that......rtfm.....or call a professional spark
Put simply, the only time a 3 pole isolator is required is if the manufacturers instructions specify that one must be fitted.
Every electrical circuit must have a point of isolation. Every electrical circuit can effectively be isolated by use of the main switch.
Local isolation is a made up term and is found nowhere in BS 7671. 'Readily accessible means of switching off' which does appear all over the BGB, is open to interpretation.
These are the main points I try to make in that post, is there anything specific you need clarification of bud?
it might not be in the wiring reg's, but the building reg's says that "an extractor fan supplied from a lighting circuit for a bathroom without a window should have it's own means of isolation, as otherwise replacement or maintenance of the fan would have to be carried out in the dark. an isolation switch for a fan with an overrun facility will need to be triple-pole (switch wire, line and neutral), and must be installed outside of zones 0, 1 and 2."
Reply to Smoke alarm 3rd core, WHY ? in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net
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