Earth Leakage problem

[HandySparks]

Hi....I am new here and have a question/problem with an earth leakage tripping.

This problem has me stumped and if anyone can help me it would be great.

A client called me out for an earth leakage tripping. Was going to do the normal test to isolate the problem but then noticed that almost all the breakers are making it trip. To cut a long story short I ended up replacing the earth leakage unit and the same thing happens. The strange thing is that this earth leakage trips on breakers which are not even wired through the earth leakage. Also it trips even when there is absolutely no power on the earth leakage.

Any ideas anyone as I am out of options here.

Is the thing that's tripping a differential current RCD or an old style Voltage Operated Earth Leakage Circuit Breaker?

Did you test the sensitivity of the first device before you changed it?

What testing have you done?

 

[J.Spark]

It's a voltage operated earth leakage circuit breaker. Trips out at 30ma as well as the new one. Did the manual testing...visual inspection and IR testing

 

[HandySparks]

It's a voltage operated earth leakage circuit breaker. Trips out at 30ma as well as the new one. Did the manual testing...visual inspection and IR testing

Any chance of a photo of this setup?

 

[J.Spark]

Will have to take the pic tomorrow as I have left site already. Bypassed the unit so long and works fine when bypassed. Will send tomorrow. Thanks

 

[Lucien Nunes]

It's a voltage operated earth leakage circuit breaker

This is important and needed to be stated explicity. VOELCBs can trip as a result of a fault in a nearby property even when the ELCB's own installation is switched off, because they monitor the CPC not the L & N. If there is a difference in potential between the earth electrode and any part of the installation CPC, perhaps at a fitting in casual or deliberate contact with an extraneous pipe, then a current will flow through the tripping coil. Possible causes include a non-protected circuit next door dumping current into a service pipe or the rods being too close together and in each others resistance area.

Conversely, this type of problem cannot affect an RCD as it neither knows nor cares what is going on with CPCs and main earthing conductors.

 

[J.Spark]

This is important and needed to be stated explicity. VOELCBs can trip as a result of a fault in a nearby property even when the ELCB's own installation is switched off, because they monitor the CPC not the L & N. If there is a difference in potential between the earth electrode and any part of the installation CPC, perhaps at a fitting in casual or deliberate contact with an extraneous pipe, then a current will flow through the tripping coil. Possible causes include a non-protected circuit next door dumping current into a service pipe or the rods being too close together and in each others resistance area.

Conversely, this type of problem cannot affect an RCD as it neither knows nor cares what is going on with CPCs and main earthing conductors.

Ok....never came across a problem like this....came across many trippings but not one of this nature. [emoji16]

 

[Octopus]

Yes I have and it's all good.

with all the bulbs out and the lights switched "on", including checking the strappers on 2 way lighting?

 

[J.Spark]

No....didn't do that....will double check on that. Thanks for the advice

 

[Octopus]

Have you got a clamp meter?

 

[J.Spark]

Yes I do