On Mon, 14 Dec 2015 18:39:28 -0000, Rod Speed wrote:



"Tough Guy no. 1265" wrote in message
news
On Mon, 14 Dec 2015 18:05:50 -0000, John Rumm
wrote:

On 14/12/2015 16:01, Tough Guy no. 1265 wrote:
On Mon, 14 Dec 2015 11:07:19 -0000, John Rumm
wrote:

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.

Why would you need to remove a 0V wire? They don't hurt when you touch
them.

Because in reality it won't be 0V. Short it to earth, and you will most
likely trip the RCD potentially de-energising other circuits.

Then the RCD is unfit for purpose. It's supposed to detect live to
ground, not neutral to ground.

Anyway, if what you said was true, it could happen with any electrical
item, as most things only have a live switched off.

(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)

Lock? You switch it off (in the VERY unlikely event you're working on
repairing or replacing the shower). If you have a wife or kids, tell
them to leave it off, not that they'd have a reason to turn it on if
they weren't trying to have a shower and failing (which is impossible
since you're in there fixing it).

If you were fixing the shower, I could understand their temptation to
turn it back on!

It's best not to electrocute someone who's doing you a favour.

In your case it would be an opportunity too good to miss.

Says the most infamous person in the group.

--
For the really paranoid who want to destroy data there's nothing like taking the lid off the disk drive and rearranging the sectors with a hammer.