Testing a rcbo at db or end of circuit?

[beatboaby924y]

Hi Boys,

Just wondering if you guys could clear something up for me.

When testing a rcbo or rcd I would always test from the end of the circuit, for example a socket on a radial circuit.

However was talking to someone recently who told me they test from the load side of the rcbo or rcd at the db. Just wondering if this is ok to do?

I suppose it would save a bit of time walking back and forth from the db to the circuit under test if you performed the test at the db but not sure if it would be allowed or if the reading would be different from carrying the test out at the end of circuit side.

Thanks in advance.

 

[Flanders]

Yes you can do this just watch out for MEM memshiled 2 ones you have to put a short peace of wire on them to test them or they will not operate with tester

 

[Pete999]

eh not sure what you mean Flanders

 

[Jay Sparks]

Yes you can do this just watch out for MEM memshiled 2 ones you have to put a short peace of wire on them to test them or they will not operate with tester

Yes, you need to do the same for some wylex ones aswell. You put a piece of 10 mm in a connector and then the connector on to one of your probes. Then you can reach the neutral in the rcbo.
And it is recommended that you test as close as possible to the rcbo, rcd.
Jay

 

[beatboaby924y]

Thanks

 

[Flanders]

The MEM Memshiled 2 RCBOs will not operate with the tester if you test them at the DB. There was a thread on this while back explaining why this happens. The way around it was to connect a short peace of cable onto the RCBO and test from the end of it or just carry out the test at any part of the circuit But in answer to the OP you can test at the DB.

 

[BES]

Yes you can do this just watch out for MEM memshiled 2 ones you have to put a short peace of wire on them to test them or they will not operate with tester

Yes, you need to do the same for some wylex ones aswell. You put a piece of 10 mm in a connector and then the connector on to one of your probes. Then you can reach the neutral in the rcbo.
And it is recommended that you test as close as possible to the rcbo, rcd.
Jay

Or use one of these

 

[shanky887614]

Are you testing the rcd/rcbo or the circuit?

Because he is just testing rcd/rcbo and there is no need to test the circuit because you have already done at least a zs

 

[Flanders]

Or use one of these

I can't see your picture very well is it a long test prong ?

 

[Flanders]

Thanks

There is a thanks Button

 

[Octopus]

Yes, you need to do the same for some wylex ones aswell. You put a piece of 10 mm in a connector and then the connector on to one of your probes. Then you can reach the neutral in the rcbo.
And it is recommended that you test as close as possible to the rcbo, rcd.
Jay

Interesting, never had any issues testing Wylex RCBO's or RCD's at the board!

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Are you testing the rcd/rcbo or the circuit?

Because he is just testing rcd/rcbo and there is no need to test the circuit because you have already done at least a zs

??????

 

[shanky887614]

Interesting, never had any issues testing Wylex RCBO's or RCD's at the board!

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??????

One of the poster's stated they test rcd at furthest point.

This doesn't seem necessarily, as long as the other values from testing comply then it will not fail a properly functioning rcd/rcbo

After all we are only checking they trip in a certain time frame

 

[Jay Sparks]

Interesting, never had any issues testing Wylex RCBO's or RCD's at the board!

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Honest sir, there horrible to test...lol
They really are a pain in the ---. My Megger probe just doesnt quite reach inside the neutral terminal, so I made a (GS38 approved) apdapter.....lol

 

[Risteard]

However was talking to someone recently who told me they test from the load side of the rcbo or rcd at the db. Just wondering if this is ok to do?

Not only is it OK - it is the correct way to test an RCD. They should not be tested with loads connected.

 

[Engineer54]

As Risteard states above, but also note that the manufacturers also recommend testing at their RCD device's terminals as well!! This is especially the case when officially recording RCD's values on test reports such as EICR's etc.... You're not testing the circuit, you're testing the RCD itself!!