Terminating SWA in knockout box outside a plastic CU

[f0rmula]

I've just noticed that my plastic Eaton MEM CU has no solid surface to fasten a gland to (apart from on the cover ). It's all knockout sections to allow cables in/out. I think I'm going to have to terminate my SWA in a box outside the CU itself.

So, something like this? http://www.tlc-direct.co.uk/Products/BX3315.html

Then run 20mm conduit into one of the CU knockouts? Seems a bit weird. Is the the best way, or does anyone have other recommendations? Starting to wish I'd bought a metal CU...

Also, as an aside, is there any reason to go for 3 core rather than 2core? This is just for supplying two outdoor sockets:

http://www.screwfix.com/p/nexus-13a-2g-rcd-switched-socket/91095#

Cheers

 

[sparkybird]

use these - they're FAB!

http://www.tlc-direct.co.uk/Main_Index/Earthing_Index/Piranhna_Earth_Nuts/

 

[ban-all-sheds]

Then run 20mm conduit into one of the CU knockouts?

Why not just butt the box up against the CU?

Also, as an aside, is there any reason to go for 3 core rather than 2core?

Not being reliant on the integrity of the gland/armour connections for your cpc.

http://www.screwfix.com/p/nexus-13a-2g-rcd-switched-socket/91095#

No.

Yes: http://www.screwfix.com/p/mk-masterseal-plus-13a-2-gang-switched-rcd-socket-active/26746

 

[f0rmula]

use these - they're FAB!

http://www.tlc-direct.co.uk/Main_Index/Earthing_Index/Piranhna_Earth_Nuts/[/QUOTE]

Sure, they replace the thin nut, but I don't have a flat surface in which to put a hole in the plastic, so I'm not sure how they help in my case.

Or are you suggesting I use them in my metal box?

 

[PrenticeBoyofDerry]

As BAS has commented on above, fix the adaptable box up against CU casing.
Then you can knockout and terminate glands and armour at adaptable box, leave enough cable to route straight through to CU terminals without any joints at adaptable box. Then pigtail an earth connection across the box to earth busbar within CU.

Recommend going for 3 core to supply a CPC

 

[f0rmula]

Why not just butt the box up against the CU?

Could do, I suppose. Cheers.

Not being reliant on the integrity of the gland/armour connections for your cpc.

Fair point.

...
No.

Yes: http://www.screwfix.com/p/mk-masterseal-plus-13a-2-gang-switched-rcd-socket-active/26746[/QUOTE]

Hmm. It'll mostly be used for lighting. Or is active actually required by regulation?

Cheers for the reply.

 

[Iggifer]

Regardless of the type of RCD, do not fit Nexus

I installed a Nexus and an MK next to each other to see the difference for myself, and the MK beats the Nexus hands down, on every category you can think of.

The seal around the lid when it's closed is phenomenal.

Will be binning the Nexus when I get around to buying another MK (perhaps when I win the lottery)

 

[plugwash]

Personally i'd use a circular conduit box.

 

[RF Lighting]

I use a conduit through box, and fit a nipple into the top of it. This gives proper containment of the wiring right into the CU.

There is also a handy screw hole in the conuit box to attatch your CPC to.

 

[f0rmula]

How do you terminate SWA into a conduit box? Do you not need a flat surface for the gland?

 

[RF Lighting]

 

[JohnW2]

Also, as an aside, is there any reason to go for 3 core rather than 2core? This is just for supplying two outdoor sockets:
http://www.screwfix.com/p/nexus-13a-2g-rcd-switched-socket/91095#[/QUOTE]
Wouldn't it be cheaper (particularly if you were going to get a decent brand of outdoor sockets) to have an RCBO in the CU than to fork out for two RCD-protected sockets?

Kind Regards, John

 

[sparkybird]

can't you just cut a 20 or 25mm hole in the bottom of the CU?

(or am I being dumb???)

 

[f0rmula]

<picture of conduit box>

Oh! I had no idea the threads were the same

 

[f0rmula]

Wouldn't it be cheaper (particularly if you were going to get a decent brand of outdoor sockets) to have an RCBO in the CU than to fork out for two RCD-protected sockets?

Hi. The CU is in the cellar, so the plan was to put the RCD out where you can reset it quicker if it does trip.