by ericmark »
Wed May 07, 2008 9:49 pm
In theory what you propose doing seems OK but in practice you have a problem in many fans require two separate supplies. Some form of isolation is also required. There has been a report in a trade magazine of a house fire caused by single rather than double fusing to extractor fans one supply did not come through FSU. It may be possible to fuse down whole lighting supply in the area to 3 amp. I am assuming it has duel supply one switched the other which maintains to fan running for set time after the light is switched off. Before the house fire report I would have just connected to 5/6 amp lighting circuit it does seem the lighting circuit where the fire occurred was 16 amp which is unusual as most ceiling roses are rated 5/6 amp. Under the new regulations, it would of course, be protected with an RCD so less likely to cause a problem. I used one with a humidity detector so single supply. Also of course, you need to ensure all sockets in the bedroom are no closer than 3.5 meters to shower tray and all sockets have earth leakage protection. Not sure on Part P. I would think any rooms containing a bath or shower becomes a bathroom so would require Part P but I will leave it to you to work out there are links on the projects page. Also do note how the lights are wired before you disconnect anything the amount of posts asking how to wire lights is unbelievable.
