Earth Leakage problem

[J.Spark]

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.

 

[telectrix]

Neutral in wrong terminal block? visual inspection followed by IR testing.

 

[J.Spark]

Hi....this distribution board hasn't been touched in 5years. All wiring and neutrals are where they are supposed to be and has been working with no tripping for 5 years. 11 circuit breakers out of 20 breakers in the board making it trip. Also when the mains is shut off completely as on no power at all on the unit it trips. IR testing doesn't pick up anything.

 

[J.Spark]

I also tightened every connection in the db. Found a few loose connections which seemed to have stopped the tripping for a bit but then tripped again. Thought I was out of the woods. There seems to be a ghost in this db!

 

[Leesparkykent]

Hi....this distribution board hasn't been touched in 5years. All wiring and neutrals are where they are supposed to be and has been working with no tripping for 5 years. 11 circuit breakers out of 20 breakers in the board making it trip. Also when the mains is shut off completely as on no power at all on the unit it trips. IR testing doesn't pick up anything.

Have you carried out IR testing on every circuit?

 

[J.Spark]

Yes I have and it's all good.

 

[micknew]

We had the same problem on a new build, the tripping was caused by a fault on the overhead DNO supply.

 

[J.Spark]

We had the same problem on a new build, the tripping was caused by a fault on the overhead DNO supply.

Hi....was that with no power on the unit as well? The incoming supply is underground here though. But will check that.

 

[Marvo]

Hi....this distribution board hasn't been touched in 5years. All wiring and neutrals are where they are supposed to be and has been working with no tripping for 5 years. 11 circuit breakers out of 20 breakers in the board making it trip. Also when the mains is shut off completely as on no power at all on the unit it trips. IR testing doesn't pick up anything.

Test for crossed or commoned neutrals (and lives) between all final circuits

 

[J.Spark]

Test for crossed or commoned neutrals (and lives) between all final circuits

Will try that as well. Thanks