How much insulation is needed leaving back box?

[twist]

Hi, I'm replacing a damaged cable to my shower and can't make a good job of getting both 10mm^2 cables in the old DP switch box without stripping the external PVC way back to promote flexibility.

The thing is these are massive cables and the one at the bottom comes from the top and vice versa, the opening at the back barely permits the two entry without needing to cross over.

Should I replace the switch or let cable leave without full outer insulation?

 

[DaveyD]

http://www.amazon.co.uk/Crabtree-2167-Shower-Switch-50amp/dp/B0048SEAAG

 

[Marvo]

Is this a trick question? It sounds like your a victim of bad planning if the cables cross, can't you rearrange them so they can enter the box in an orderly fashion? Stripping the insulation way back to make them more flexible would not be a good idea. Maybe a photo would give us a better idea of the problem.

 

[twist]

No trick, it's a wall switch, and now the cable is cut, it will forever be a wall switch and not a ceiling switch. I like it high, outside the shower room, and the shower higher still, safe from the torrents.

 

[PEG]

If it's safe you like it,you need to leave as MUCH insulation on as you can manage.Re-arrange to accomodate this.:teeth_smile:

 

[twist]

I think I'd like more room and a bigger switch, like this, Toolstation > Electrical > White Flat Plate > White Flat Plate Switch Tall Twin

Would I just fit a double socket pattress box behind it? What's this "twin" business? Looks like a single switch, only taller.

Answered: http://www.screwfix.com/p/marbo-45a-dp-cooker-shower-switch-with-neon-white/64451

 

[GLENNSPARK]

you want to watch them twin pairs of feet in shower cubicles....

 

[twist]

As long is doesn't require twin showers eh?

 

[Guest55]

dont tell me your trying to terminate 2x 10mm's in a 1 gang box ??
lol no wonder your struggling
yes , use a double switch plate in your link with a 47mm 2 gang box.

 

[micknew]

DIYer, best not advise in case he kills someone

 

[twist]

Ok, was going to do that.

I DIY I die, so no, but I repair and replace.

Seems most wall mounted DP switches are for cookers, anyone know if they will give the requisite 3mm contact separation and which standard I need to look for to ensure this? Or just buy Crabtree and trust in quality?

 

[micknew]

Thought so!

 

[twist]

Thought nothing.

 

[Plonker 3]

As long as it comes with a BS number or flag on it then it will be fine for what you are using it for.

 

[micknew]

Thought nothing.

Thought so, not clever or intelligent enough to work on a shower circuit.