Dumbo brain freeze

[MickSmith5824]

Hi all, having a stupid moment. Come across this today on job. See photo. It's RCD supplying 10mm shower. As you can see the supply side is coming in on bottom load side so to me that's complete no no but what I'm not clear on does this RCD offer any sort of overload protection.....is it actually a RCBO? I've not come across this manufacturer before . The In rating is the current setting of device. Which in this case is 63amp. So is this infact the overload rating....63? Just that I always thought this In rating on RCD's was just the level of current it could safely withstand with out damage but is not actually the rating for overload protection

 

[DPG]

Yes, that's an RCD, not an RCBO.

 

[Taylortwocities]

As above. It’s an RCD of uncertain origin. Actually there’s one of this make on sale on FleaBay.
There is no overload protection. The 63A is just the max throughput current.
What is thus RCD protecting?

The labelling is wrong. Press test button monthly? ??

 

[DPG]

As above. It’s an RCD of uncertain origin. Actually there’s one of this make on sale on FleaBay.
There is no overload protection. The 63A is just the max throughput current.
What is thus RCD protecting?

The labelling is wrong. Press test button monthly? ??

Looks like some foreign example. I think I'd be a bit wary of it. Sounds racist that ?

OP, you are asking about over current protection - does the circuit not have this elsewhere?

 

[littlespark]

Looks like the ones that came in caravan hook up boxes from 2000’s.

Rolec? Same colour, same shape of switch.

Which I believe were rebranded something else, because just about anything would fit.

The one in the picture is an rcd, so I take it there’s an OCPD in the board supplying this? 45 or 50A mcb maybe...
Any isolator switch between here and shower may only be rated to 50A anyway

 

[GBDamo]

Hi all, having a stupid moment. Come across this today on job. See photo. It's RCD supplying 10mm shower. As you can see the supply side is coming in on bottom load side so to me that's complete no no but what I'm not clear on does this RCD offer any sort of overload protection.....is it actually a RCBO? I've not come across this manufacturer before . The In rating is the current setting of device. Which in this case is 63amp. So is this infact the overload rating....63? Just that I always thought this In rating on RCD's was just the level of current it could safely withstand with out damage but is not actually the rating for overload protection

If its a BS61008 then no overload just RCD.

There are two module RCBOs, but they'd have a neutral fly lead and possibly functional earth and comply with BS61009.

 

[Mike Johnson]

The Hager two module RCBO's do not have a neutral or earth fly lead, and do have an earth fault indicator: Electrical Wholesaler - Hager RCBO 2P(1P+N) 6kA B-20A 30mA A Class AD920J - https://www.electricalwholesaler.ie/products/switchgearfuses/switchgeardistribution/rcboresidualcurrentbreakers/hagerrcbo2p1pn6kab20a30maaclassad920j not sure if they manufacture a 63amp version.

 

[GBDamo]

The Hager two module RCBO's do not have a neutral or earth fly lead, and do have an earth fault indicator: Electrical Wholesaler - Hager RCBO 2P(1P+N) 6kA B-20A 30mA A Class AD920J - https://www.electricalwholesaler.ie/products/switchgearfuses/switchgeardistribution/rcboresidualcurrentbreakers/hagerrcbo2p1pn6kab20a30maaclassad920j not sure if they manufacture a 63amp version.

Is that a new AD range then, I have a few old ADs and they have a neutral fly lead.

I hate progrrss...?

 

[Taylortwocities]

Ps. In general, most RCDs can take their incoming from top or bottom.

 

[MickSmith5824]

As above. It’s an RCD of uncertain origin. Actually there’s one of this make on sale on FleaBay.
There is no overload protection. The 63A is just the max throughput current.
What is thus RCD protecting?

The labelling is wrong. Press test button monthly? ??

Looks like some foreign example. I think I'd be a bit wary of it. Sounds racist that ?

OP, you are asking about over current protection - does the circuit not have this elsewhere?

Looks like the ones that came in caravan hook up boxes from 2000’s.

Rolec? Same colour, same shape of switch.

Which I believe were rebranded something else, because just about anything would fit.

The one in the picture is an rcd, so I take it there’s an OCPD in the board supplying this? 45 or 50A mcb maybe...
Any isolator switch between here and shower may only be rated to 50A anyway

Thanks guys. I wasn't totally being a doughnut then just mostly ? the circuit is supplying a shower. The circuit is not supplied via any other MCB the neutral and live supply to the RCD is from Henley Blocks that are in turn supplied from main supply cable so in effect the only protection is from the 60 amp main service fuse. Obviously this is a big no no in terms of circuit design as faulty/overload would take out the whole property but got me thinking could it technically be acceptable? As 10mm PVC clipped direct has 63 max current. Not entirely sure of installation method and may be a 15 metre run so will change this anyway

 

[DPG]

Thanks guys. I wasn't totally being a doughnut then just mostly ? the circuit is supplying a shower. The circuit is not supplied via any other MCB the neutral and live supply to the RCD is from Henley Blocks that are in turn supplied from main supply cable so in effect the only protection is from the 60 amp main service fuse. Obviously this is a big no no in terms of circuit design as faulty/overload would take out the whole property but got me thinking could it technically be acceptable? As 10mm PVC clipped direct has 63 max current. Not entirely sure of installation method and may be a 15 metre run so will change this anyway

You can't rely on the DNO's fuse to protect the shower. It's a definite no-no.

 

[freddo]

Ps. In general, most RCDs can take their incoming from top or bottom.

Not all though, some will detonate if reversed and the test button is pressed, I've done it twice!

 

[Taylortwocities]

You could use that RCD, provided it passes the relavent tests, but you must add an appropriate MCB.

 

[MickSmith5824]

You could use that RCD, provided it passes the relavent tests, but you must add an appropriate MCB.

Ok thanks Taylor will definitely do. Was just a query really if there was any possible case for it, and more to the point what the original installer was thinking when installed

 

[freddo]

It seems to be a common issue, seen 3 40A RCDs used in this way to connect electric showers.