Rotary Isolator maintainig IP

[councillor]

Im mounting a Rotary Isolator on an external wall and the cable is coming through the wall straight into the back of the isolator . Im not using SWA and I don't want to fit a gland as it means knocking lumps out of the wall. Whats the best way to maintaian its IP... (silicone?) . Is this alowable?

 

[ColJack]

metal box inside and gland into that then use conduit through the wall and plenty of silicone behind the isolator to stop water getting down the back..

 

[councillor]

Thanks Col, let me explain further:
The CU will be directly behind the isolator on the otherside of the wall. Also I was going to use a cable with an earthed metal sheath so it complys with 522.6.6 I will still solicon the isolator as you sugest.
ok with that?

 

[ColJack]

if the CU is directly behind it then one assumes you're going straight out of the back of it through the wall? any bother with 2-300mm of SWA just for that..?
it's highly unlikely that anyone will put a nail or screw through it..
it would probably need and RCD on it anyway so why bother with SWA?

 

[councillor]

I wasnt going to use SWA Just SY cable that has an earthed metallic sheath (braid). Thinking about it though my islator is considered an accessory and so is the CU and thus is considered a safe cable route or zone so really I could use T&E in the wall so long as its RCD protected

 

[ColJack]

sy doesn't qualify for "earthed metalic sheath" duty since the strands are too fine and are not covering enough of the cable.. it's perfectly possible to stick a nail into the cable and miss the braid if you get it in the middle of one of the blank spots.

if they are on opposite sides of the wall ( ie back to back ) then zones don't apply...

 

[councillor]

Thats good advice, didnt know that re SY. After all that thought I think I will just use T&E as Im fairly sure it comply with the regs.