Earth Fault Loop Impeadance Test Trips RCD??

Mike2007 · 5 Nov 2007

Why would the EFLI test trip an RCD ( I have trip-lock)? I have tested my tester against a previously tested system to check the instrument (which is fine).
Any thoughts would be appreciated.

DESL · 5 Nov 2007

Do a ramp test on the RCD and see if it is tripping at correct current

Spark123 · 5 Nov 2007

Is it an electronic RCD? What make of tester? I have heard of problems with D-Lock testers and some electronic RCDs such as those found in a majority of RCBOs.

RF Lighting · 5 Nov 2007

Did you do a THREE lead test?

Mike2007 · 5 Nov 2007

RF Lighting said:
Did you do a THREE lead test?

Yes it was three leads, a Fluke 1652 tester. As I said it was tested against my brothers board which has an RCD.
Very certain it was not an electronic RCD on failed test.

DESL · 5 Nov 2007

I suspect a sensitive RCD.

Did it hold on the 0.5xI test?

Was the tripping current greater than 20mA on ramp test?

Mike2007 · 5 Nov 2007

DESL said:
I suspect a sensitive RCD.

Did it hold on the 0.5xI test?

Was the tripping current greater than 20mA on ramp test?

Have not done an RCD test yet, never thought adding some sockets would lead to such a complicated outcome!

DESL · 5 Nov 2007

It's not complicated - process of elimination

With all fault finding you try eliminate the simple things 1st.

Easy to test and eliminate faulty RCD before you start looking for dodgy connections in cct and accessories.

theshogun · 5 Nov 2007

Might sound obvious but check the leads into the meter are connected correctly as if you have reversed the blue and green you will get this problem.

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Earth Fault Loop Impeadance Test Trips RCD??

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