Advice on fixing this outside mess

[RDB85]

Basically I’ve attended a friend house who asked me to see why his power to his sheds had stopped working. Any help or advice on fixing this mess please

 

[RDB85]

How would the proposed NYY-J replacement be routed back to that consumer unit?

Via conduit.

 

[timhoward]

Slightly off topic but this has intrigued me for ages, you state "B32 possibly feeding two radials" as that's what it looks like but I don't believe that device has any over current protection at all, its just an RCD with contacts rated to 32A just like the 63A and 80A RCD's we so often see in consumer units.

You make a good point, I wondered that after I wrote it.
@RDB85 if you look up the CCC I would think the 4mm NYY-J’s tabulated value is lower that 40 amps. (I haven’t checked)

I’d back track a bit and do some testing - the SWA is not going to cause a downstream device tripping and is likely fine.
(If I was going to run galv conduit I wouldn’t be pulling NYY-J through it)

 

[nicebutdim]

Via conduit.

Galv conduit would certainly provide good mechanical protection. @timhoward raises the issue of CCC - I don't know the differences between SWA and NYY off the top of my head, nor the correction factor when enclosed in conduit, but you may need to increase cable size and also that of the conduit. Seems like quite a bit of additional cost for something that isn't known to be faulty.

 

[RDB85]

Right so I’ve done some further investigation back at the consumer unit in the garage. Tested for Continuity and IR and got nothing. Open up the Consumer unit to find that when it was converted into a room. They decided to cut it. So the feed that goes from there to the RCD is no more.

The NYY-J is what was left over from the previous installation for both shed radials.

 

[westward10]

So it isn't working because it has been disconnected?

 

[oscar21]

You make a good point, I wondered that after I wrote it.

I had the same problem a few months ago, my mate was looking at some wiring in a food wagon and he rang me for advice on what to do next, he says there is a 32A RCD protecting the installation without any breakers and I said well if its a 32A RCD then it must be an RCBO so its covered but he was adamant it was just an RCD, when he sent me a picture and I looked a bit closer it dawned on me that it was indeed just an RCD.

If it said 63A or 80A etc the you would automatically assume its just an RCD without any other protection, its just the fact that it has a low value on it that I think loads of people will think its an MCB as well, same as the 20A and 25A ones that are also knocking about. Just doesn't make any sense to me to have all that different tooling to make different rated RCD's when a 100A would cover everything, the cost on saved metal must be minuscule.

 

[RDB85]

So it isn't working because it has been disconnected?

That would be the case. Initial when looking the RCD was off and looking inside and seeing the water ingress I then done some testing and when nothing happened I then went to the Consumer Unit in the Garage.

 

[nicebutdim]

I had the same problem a few months ago, my mate was looking at some wiring in a food wagon and he rang me for advice on what to do next, he says there is a 32A RCD protecting the installation without any breakers and I said well if its a 32A RCD then it must be an RCBO so its covered but he was adamant it was just an RCD, when he sent me a picture and I looked a bit closer it dawned on me that it was indeed just an RCD.

If it said 63A or 80A etc the you would automatically assume its just an RCD without any other protection, its just the fact that it has a low value on it that I think loads of people will think its an MCB as well, same as the 20A and 25A ones that are also knocking about. Just doesn't make any sense to me to have all that different tooling to make different rated RCD's when a 100A would cover everything, the cost on saved metal must be minuscule.

I'm not sure why some people make this assumption, but it certainly calls their competence into question.

Would they make similar assumptions about the rating of an isolator?

 

[nicebutdim]

So it isn't working because it has been disconnected?

Not the outcome I'd been expecting.

 

[westward10]

Just goes to show, start with the basics.

 

[RDB85]

With that now the culprit. I’ve ordered a vent plug for the Wiska Box. Some Wago 222 Connectors and something to connect the Wiska Box and RCD enclosure.

In hindsight singles would probably be better but I’ve got 30m of NYY and the price of cable and also selling the NYY.

 

[westward10]

Why are you going to replace the cable?
Are you going to reconnect it?

 

[Mikegh]

I had the same problem a few months ago, my mate was looking at some wiring in a food wagon and he rang me for advice on what to do next, he says there is a 32A RCD protecting the installation without any breakers and I said well if its a 32A RCD then it must be an RCBO so its covered but he was adamant it was just an RCD, when he sent me a picture and I looked a bit closer it dawned on me that it was indeed just an RCD.

If it said 63A or 80A etc the you would automatically assume its just an RCD without any other protection, its just the fact that it has a low value on it that I think loads of people will think its an MCB as well, same as the 20A and 25A ones that are also knocking about. Just doesn't make any sense to me to have all that different tooling to make different rated RCD's when a 100A would cover everything, the cost on saved metal must be minuscule.

I suppose everything has a price point. It could be quite a bit more expensive overall to manufacture a 100A rated RCD compared to a 25A

So the manufacturer only making 100 A RCDS would be competing on price against the 25 32 40 and 63 manufactured by others

 

[nicebutdim]

With that now the culprit. I’ve ordered a vent plug for the Wiska Box. Some Wago 222 Connectors and something to connect the Wiska Box and RCD enclosure.

In hindsight singles would probably be better but I’ve got 30m of NYY and the price of cable and also selling the NYY.

Other than having been disconnected is there anything wrong with the existing cable?

 

[RDB85]

Why are you going to replace the cable?
Are you going to reconnect it?

I can’t reconnect it. It’s been cut between the garage and outside.