DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Electric shower isolation switch?

Goto page 1, 2  Next
 
Post new topic   Reply to topic    DIYnot.com Forum Index > Electrics UK
Search this topic :: View previous topic :: View next topic  
Author Message
r896neo

from United Kingdom

Joined: 23 Feb 2007
Posts: 3401
Location: Belfast,
United Kingdom
Thanked: 526 times

PostPosted: Tue Dec 01, 2009 11:57 am Reply with quote

I am upgrading to a 10mm cable and changing the pullcord for a switch outside the door for a new electric shower. I am getting someone in to do the connections at switch and CU but as its a small job i want to have everything he needs here ready.

I am running the cable from CU cupboard to the new proposed switch and fitting a dry-lining box into the wall outside the door for it but can i site the box at the level of existing switchs which is 145cm from finished floor or does it need to be lower?

any other preparations advice welcome, i.e. will a standard dryling box be deep enough for this or would a deep one be better?
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
bongos

from United Kingdom

Joined: 07 Jul 2007
Posts: 1004
Location: London,
United Kingdom
Thanked: 78 times

PostPosted: Tue Dec 01, 2009 12:16 pm Reply with quote

r896neo wrote:
I am upgrading to a 10mm cable and changing the pullcord for a switch outside the door for a new electric shower.

r896neo wrote:
I am running the cable from CU cupboard to the new proposed switch and fitting a dry-lining box into the wall outside the door for it but can i site the box at the level of existing switchs which is 145cm from finished floor

When you say existing switch - do you mean light switch - ie the new shower isolator is going to be next to the light switch?

r896neo wrote:
any other preparations advice welcome, i.e. will a standard dryling box be deep enough for this or would a deep one be better?

A deeper drylining box would definitely be better. Have you ever tried to terminate 10mm˛ in a tiny box. icon_lol.gif

Remember this is all notifiable work so your electrician will have to able to inspect the entire cable route to be able sign it off (i'm assuming you have agreed this with them in advance?)
Back to top
 Alert Moderators
r896neo

from United Kingdom

Joined: 23 Feb 2007
Posts: 3401
Location: Belfast,
United Kingdom
Thanked: 526 times

PostPosted: Tue Dec 01, 2009 4:10 pm Reply with quote

no, the light will be switched by an existing pull cord in the bathroom but i want to create a new isolation switch outside the door, the existing light switches i was refering to are elsewhere on the landing so was hoping to match them.
Back to top
 Alert Moderators
mikhailfaradayski

from United Kingdom

Joined: 21 Jul 2009
Posts: 1677
Location: Derby,
United Kingdom
Thanked: 86 times

PostPosted: Tue Dec 01, 2009 5:27 pm Reply with quote

Ditto the bit about notifiable work - please consult your Electrician before doing anything.

In general, theres nothing to say it can't be done that way but consider the downside-

If you have kids/guests etc, whats to stop them accidentally switching off the power to the shower when someone is using it?
I can imagine some teenagers would find it pant-wettingly funny to knock it off whilst sister/brother has soap in their eyes.

Whats wrong with a pull cord isolator next to the bathroom light switch?
Back to top
 Alert Moderators
r896neo

from United Kingdom

Joined: 23 Feb 2007
Posts: 3401
Location: Belfast,
United Kingdom
Thanked: 526 times

PostPosted: Tue Dec 01, 2009 9:58 pm Reply with quote

The shower empties into a bath and the bathroom is so small that there is nowhere sensible i can site the pull cord that you can not reach whilst using the shower.

As for the routing it is only 10m of cable under the suspended floor in the ground floor and then surface mounted up a wall and into the stud where it terminates so its all easy for him to check and get at if necessary

Any ideas on the height of the box? As said I'd prefer it to match the others nearby at 1450mm or do i need to put it at 1200
Back to top
 Alert Moderators
ban-all-sheds

from United Kingdom

Joined: 27 Aug 2003
Posts: 48571
Location: London,
United Kingdom
Thanked: 1838 times

PostPosted: Wed Dec 02, 2009 8:40 am Reply with quote

bongos wrote:
Remember this is all notifiable work


r896neo



Joined: 23 Feb 2007
Posts: 538
Location: Belfast,
United Kingdom
Thanked: 6 times
Back to top
 Alert Moderators
ban-all-sheds

from United Kingdom

Joined: 27 Aug 2003
Posts: 48571
Location: London,
United Kingdom
Thanked: 1838 times

PostPosted: Wed Dec 02, 2009 8:42 am Reply with quote

r896neo wrote:
the bathroom is so small that there is nowhere sensible i can site the pull cord that you can not reach whilst using the shower.

So?


Quote:
Any ideas on the height of the box? As said I'd prefer it to match the others nearby at 1450mm or do i need to put it at 1200

You can have it at whatever height you like.
Back to top
 Alert Moderators
holmslaw

from Vanuatu

Joined: 12 Dec 2006
Posts: 5844
Location: Vanuatu
Thanked: 400 times

PostPosted: Wed Dec 02, 2009 8:47 am Reply with quote

..


Last edited by holmslaw on Fri Mar 30, 2012 9:56 am, edited 1 time in total
Back to top
 Alert Moderators
ban-all-sheds

from United Kingdom

Joined: 27 Aug 2003
Posts: 48571
Location: London,
United Kingdom
Thanked: 1838 times

PostPosted: Wed Dec 02, 2009 8:51 am Reply with quote

What's the purpose of the switch?
Back to top
 Alert Moderators
holmslaw

from Vanuatu

Joined: 12 Dec 2006
Posts: 5844
Location: Vanuatu
Thanked: 400 times

PostPosted: Wed Dec 02, 2009 12:20 pm Reply with quote

..


Last edited by holmslaw on Fri Mar 30, 2012 9:56 am, edited 1 time in total
Back to top
 Alert Moderators
bernardgreen

from United Kingdom

Joined: 03 Nov 2006
Posts: 10872
Location: Bedfordshire,
United Kingdom
Thanked: 834 times

PostPosted: Wed Dec 02, 2009 12:37 pm Reply with quote

ban-all-sheds wrote:
What's the purpose of the switch?


To isolate the shower for maintainance with the isolator in full view of the technician while he or she is working so it cannot be turned on by another person without the technician being aware of it before receiving a potential lethal electric shock.

Or

To rapidly turn off power to the shower when the shower unit is malfunctioning and it is unsafe to approach due to scalding water, melting plastic or sizzling electrical activity on the surrounding wall. It does help in this situation to have the switch inside the room and thus avoid the appearance of a wet and shaken naked body on the landing outside the bathroom. This could cause embarrassment.
Back to top
 Alert Moderators
GaryMo

from United Kingdom

Joined: 03 Jul 2007
Posts: 4111
Location: Manchester,
United Kingdom
Thanked: 165 times

PostPosted: Wed Dec 02, 2009 1:20 pm Reply with quote

I cant see how having a shower isolation switch on a landing can be a departure from BS7671 unless the manufacturer specifically states a required distance and that its located in the same room as the shower.

The isolation for maintenance reason given above doesnt stand as the protective device for that circuit could be locked off or pulled in the same way it would be when working on a socket or luminaire.


Last edited by GaryMo on Wed Dec 02, 2009 1:24 pm, edited 1 time in total
Back to top
 Alert Moderators
ban-all-sheds

from United Kingdom

Joined: 27 Aug 2003
Posts: 48571
Location: London,
United Kingdom
Thanked: 1838 times

PostPosted: Wed Dec 02, 2009 1:20 pm Reply with quote

holmslaw wrote:
"537.2.1.2 Suitable means shall be provided to prevent any equipment from being inadvertantly or unintentionally energised."

Why is a switch just outside the doorway unsuitable?


bernardgreen wrote:
To isolate the shower for maintainance with the isolator in full view of the technician while he or she is working so it cannot be turned on by another person without the technician being aware of it before receiving a potential lethal electric shock.

Why can't the MCB for the shower circuit be used for that?


Quote:
To rapidly turn off power to the shower when the shower unit is malfunctioning and it is unsafe to approach due to scalding water, melting plastic or sizzling electrical activity on the surrounding wall. It does help in this situation to have the switch inside the room and thus avoid the appearance of a wet and shaken naked body on the landing outside the bathroom. This could cause embarrassment.

So it's an emergency switch?
Back to top
 Alert Moderators
holmslaw

from Vanuatu

Joined: 12 Dec 2006
Posts: 5844
Location: Vanuatu
Thanked: 400 times

PostPosted: Wed Dec 02, 2009 1:46 pm Reply with quote

..


Last edited by holmslaw on Fri Mar 30, 2012 9:57 am, edited 1 time in total
Back to top
 Alert Moderators
ban-all-sheds

from United Kingdom

Joined: 27 Aug 2003
Posts: 48571
Location: London,
United Kingdom
Thanked: 1838 times

PostPosted: Wed Dec 02, 2009 1:59 pm Reply with quote

So why can't you have the switch for the shower outside the door and use the MCB to prevent it from being inadvertantly or unintentionally energised?
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Electrics UK All times are GMT
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Electric shower isolation switch? 2 380 Fri Nov 13, 2009 9:44 pm
New electric shower isolation 6 680 Sun Oct 28, 2007 7:31 pm
electric shower local isolation 26 460 Sun Aug 10, 2014 1:29 pm
Shower isolation switch 18 240 Sun Nov 17, 2013 1:45 pm
Overheating N cable in shower Isolation Switch 7 180 Fri Feb 21, 2014 10:12 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.