Using twin & earth for sub board

[JakeC]

Yes sorry thats if they are differen't if they are the same either could trip

 

[rich.250]

I would try to achieve discrimination.
Well I would.

What's earthing arrangement?
Could you not supply sub via a non Rcd way?

 

[Guitarist]

NAPIT require 2391 for Part P registration? you sure about this?

 

[Guitarist]

63A 30mA at main and 40A 30mA

Edit : Just done some research and see the most sensitive will trip first

I don't mean to sound harsh, but you are doing 2391 and you had to do some research to find out about RCD's?

 

[Octopus]

I don't mean to sound harsh, but you are doing 2391 and you had to do some research to find out about RCD's?

I was thinking that too!!

 

[yellowvanman]

Hum, its always best to use 3 core SWA!

Nothing wrong with 2 core SWA.

 

[micknew]

He did say best to use 3 core, you can't argue with that can you.

 

[D80]

What is the CSA of the SWA conductors? Don't see any real issue in it being 2 core, just needs glanded off properly.

What size of MCB is protecting the SWA?

 

[micknew]

No issues at all D80 but metal to metal joints with ring/locknuts could break down in time if in a damp situation.
The 3rd copper core won't.

 

[telectrix]

No issues at all D80 but metal to metal joints with ring/locknuts could break down in time if in a damp situation.
The 3rd copper core won't.

i've been on a couple of breakdowns where water has penetrated into a conduit box and rotted through copper conductors. the steel armour was intact in both cases.

 

[micknew]

Must have been electrolytic action Tel.

 

[Guitarist]

I love how these threads always end up with the regulars discussing matters while the OP is probably down the pub...

 

[JakeC]

I've done the 2391 thought it wasnt too bad just didn't click about 2 rcds in series not something mentioned just need more experience. Not learnt anything about surge protection either yet.

Watchers dropped off abit so probably crack back on when its picked up.

 

[Guitarist]

I've done the 2391 thought it wasnt too bad just didn't click about 2 rcds in series not something mentioned just need more experience. Not learnt anything about surge protection either yet.

Watchers dropped off abit so probably crack back on when its picked up.

That's where a qualification is only worth having when backed up with years of experience.

 

[JakeC]

True, but what better way to get some experience than a shed install