On 12/12/2015 12:52, ARW wrote:
"Mike Humphrey" wrote in message
o.uk...
Graham. wrote:
On Fri, 11 Dec 2015 23:29:35 -0000, "Tough Guy no. 1265"
wrote:

Had a look around on t'internet, seems to be no real reason to have
a shower cord in the bathroom. Why does it need to be switched off
any more than any other appliance? Apart from maintainence once a
decade, in which case you pull the fuse in the fusebox.

Doesn't have to be a pullcord, can be a dolly switch outside the
bathroom.
I don't trust pullcord switches, even if they have a mechanical
tell-tail, so I would always isolate upstream as well.

Every appliance needs an isolator, and an isolator must isolate all live
conductors - that is both line and neutral.

On a TN system there is no requirement to isolate the neutral and a
single pole MCB is allowed to be the isolator.

Indeed, although if you only have single pole switching, then you need
to have a suitable place to allow disconnection of the neutral as well
(537.2.1.7).

One could do this at the CU, but it seems preferable to have another
place to do that.

(its also good practice IMHO have local isolation for showers, since
this avoids the whole issue of needing to lock our the MCB, and gives
the consumer confidence that they have a way of turning it off in the
case of an emergency)


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/