Rcd tripping on no trip Eli test

[hoover]

Hi using a megger 1552 to do a few earth loops in a house. It's on the no trip function but still the rcd trips. Never had this before as usually the rcd holds out long enough to get the required reading for the earth loop imp. It's a tt system and the rcd ( 30 ma) is relatively new. Any thoughts?

 

[netblindpaul]

OK, my comment was wrt ELI, check the RCD on ramp to check it is not faulty.
The RCD test comment was a general one.

 

[SPARTYKUS]

i would first do a ramp test on the RCD. you may have leakage just below the threshold, and your loop test is taking it over.

My money's on Tel's answer.

 

[netblindpaul]

My money's on Tel's answer.

Quite, an earth leakage clamping would be a good test too.