Zone 3 does not exist anymore...--John Rumm 01:08, 17 January 2009 (GMT)
Yeah, I dont have the 17th edn details to hand. NT 11:28, 17 January 2009 (GMT)
"For types other than those integrated into light fittings, power will need to be taken from a radial or ring circuit via a fused spur or similar."
There are lots of 500w or so radiant heaters around that run happily off lighting circuits. NT 15:37, 23 July 2009 (BST)
Zones and Zone Diagram
There is no zone 2 around sinks according to the IET and the NICEIC rules. Page 51 of the 17th edition OSG gives more detail.--ARWadsworth 18:06, 23 October 2010 (BST)
Mains Extractor Fans with RCD protection
I don't know if it's worth maintaining the Wiki given how few new readers turn up these days but I came here to check a point (not trusting my wotsit to wotsit much these days) and noticed what it said about mains extractor fans in Zone 1 is out of date (or at least out of line with eg http://electrical.theiet.org/wiring-matters/53/section-701/index.cfm.
The changes I propose are:
a. in "Zones", under "Zone 1",
i.in the second bullet after " Electrical appliances must be SELV with the transformer outside all the zones" add " (subject to some exceptions - see under Extractor Fans below)"
ii. in the third bullet after "Electrical appliances must be IPX4 or better" add " (IPX5 or better if at risk of spray - eg from a shower)"
b. in "Extractor Fans" amend the first para to read as follows:
"Two types of extractor fan are commonly located in a bathroom: mains and SELV (typically 12V).
- a SELV (Low voltage) fan is generally required for use in zone 1 - over a bath for example.
- a mains fan can be used in Zone 1 (as well as Zone 2 and outside the zones) if protected by a 30 mA RCD and permitted for such installation by the manufacturer. But many installers still fit only SELV fans.
Ducted fans are typically installed outside of the room and are hence not subject to any special rules."
I'm happy to edit the page but thought I ought to expose it first as I'm not sure about current practice.