R1 + R2 on RCD

[nickblake]

Probably will trip the RCD if the RCD is in the circuit after the MCB then what you are doing is slapping a few volts and ma's through the RCD even though the voltage you are testing at is low the current used in the R1 and R2 test my exceed that of the RCD its being tested across 2 conductors causing and imbalance thus the RCD trips , as sintra says do a to stage test or tempuaraly remove the RCD oh and what ever you do dont do an IR test with the RCD in the circuit

 

[confused-fuse]

what make of RCD ?? do you have a image of the rcd ..

 

[jreid67]

what make of RCD ?? do you have a image of the rcd ..

not too sure, it was just on a 2391 test board. i was thinking along the line of nickblake. The 1651b tester is new so dont think its faulty as all readings are the same as other tester

 

[chris gray]

the reason its tripping the rcd out is due to you leaving the neutral conductor in at the board

 

[jreid67]

cheers il give that a try, i'd never of thought to do that

 

[chris gray]

just read nicks post and he explains it a lot better than i did,
i always disconnect every conductor of the circuit from the board when im doing that test, so ive never had the problem you said, but it makes sense that it could take the rcd out tho.

 

[Michael Kelly]

I have the same problem now on an EICR.
Radial Circuit is wired out an MCB, L+N through a bog standard RCD with the cpc crimped through. I have LN+E Disconnected out of the DB I have shorted my cpc And R1 with R1+R2 leads, go to the last socket and a recently calibrated megger 1502 trips the rcd on th ohms scale when trying to read R1+R2??
Anyone??

 

[Strima]

By pass the RCD, the RCD is seeing current on the Line but nothing on the neutral so is tripping out.

As it's an EICR it is acceptable to carry out an R2 only.

 

[Octopus]

Are you sure the circuit is isolated. I would recommend you disconnect the live from the mcb, and connect to the earth bar

 

[hightower]

Link out at board, link out at last fitting, and Carry out the test at the RCD - one lead on line incomer the other on outgoing