No RCD in sub main

[KeenPensioner]

Are you sure? That is a very odd cable to use for a domestic installation these days considering it costs around £10/m

I'm not sure whether its MICC but I attach an image of what they've run to my hut. None of the cable is exposed to the elements.

 

[westward10]

Looks like rubber flex to me. Can you show a larger section in situ.

 

[davesparks]

That looks like NYYJ to me, very different to MICC!

 

[KeenPensioner]

Looks like rubber flex to me. Can you show a larger section in situ.

Thanks for getting back so quickly. I attach another image. My sparky is coming back tomorrow to hook up the CU

 

[Pete999]

I'm not sure whether its MICC but I attach an image of what they've run to my hut. None of the cable is exposed to the elements.
View attachment 53750

Not MICC then, was this cable circular before you split it to show it's construction? or was it flat?

 

[westward10]

Are the copper cores solid, stranded or multi-stranded.

 

[KeenPensioner]

Not MICC then, was this cable circular before you split it to show it's construction? or was it flat?

Thanks for reply. The cable is circular

 

[KeenPensioner]

Are the copper cores solid, stranded or multi-stranded.

Thanks for the reply. Conductors are solid core

 

[westward10]

I go with Dave then in #23 It is NYY-J.

 

[Pete999]

Thanks for reply. The cable is circular

Solid conductors, some sort of FP Cable???

 

[westward10]

No it is NYY-J commonly known as Hi-Tuff.

 

[KeenPensioner]

Just a big thank you to you all. I know "a little knowledge is a dangerous thing" and having a little knowledge would certainly apply to me, but I'm still learning and you guys help greatly.

 

[AJshep]

Either way Hi-tuff has not got an earthed metallic covering (like SWA) so it will need to be protected at source by an RCD like he has. Just not ideal its attached to the same RCD thats covering some of your house circuit's

 

[ipf]

Hi-Tuff is a good alternative to swa in some circumstances.
Question is, is the cable being run underground to the shed? If so, it's not an option, due to insufficient protection.
How old is the consumer unit? Is it possible to alter and feed via RCBO?

 

[KeenPensioner]

Hi-Tuff is a good alternative to swa in some circumstances.
Question is, is the cable being run underground to the shed? If so, it's not an option, due to insufficient protection.
How old is the consumer unit? Is it possible to alter and feed via RCBO?

Thanks for replying. The cable is cleated to joists through my shop store to the shed attached to the shop store. At no point is it underground. As in the OP, the consumer unit fitted by my sparky is a brand new Hager 10 way dual RCD

 

[ipf]

Thanks for replying. The cable is cleated to joists through my shop store to the shed attached to the shop store. At no point is it underground. As in the OP, the consumer unit fitted by my sparky is a brand new Hager 10 way dual RCD

OK, then.
As regards the Hager, I'm not positive, but would think it's possible to create a non RCD protected section. 20/32 amp RCBO should be fine.

 

[davesparks]

Either way Hi-tuff has not got an earthed metallic covering (like SWA) so it will need to be protected at source by an RCD like he has. Just not ideal its attached to the same RCD thats covering some of your house circuit's

That doesn't necessarily mean it needs to be protected by RCD.
This would only be required for the cable if it was chased in to a wall at less than 50mm deep, so if it is clipped direct as it appears then its not needed.

 

[AJshep]

That doesn't necessarily mean it needs to be protected by RCD.
This would only be required for the cable if it was chased in to a wall at less than 50mm deep, so if it is clipped direct as it appears then its not needed.

Agreed. For some reason I was under the impression it was buried.