Sorry Lads and Lasses,
I know this has been discussed many times throughout this forum and other websites but I just can’t get my head round the testing of a 3 phase supply connected to a 3 phase isolator and a DOL starter/motor. There could also be a 3 phase socket.
After finding many solutions I’m finding it difficult to interpret some jargon and some written English literature, apologies to those that I have offended at his stage! It could be just my lack of experience of current electrical jargon and abbreviations.
I know how to measure my R1 + R2 from DB and motor by simply linking between L1 + CPC at DB then measure L1 + CPC at the motor and then repeat the steps with L2 and L3.
I’ve read that I would have to do a separate R1 and R2 from motor to isolator? But I presume you could measure from DB to isolator using the steps outlined above, link L1 – CPC at DB and L1 – CPC at isolator to get R1 + R2 and so on and add the readings of the motors (R1 + R2) and the isolators readings (R1 + R2) together to get the overall (R1 + R2).
If I’m wrong and you have to do a separate R1 and R2 from isolator and motor how would I go about doing this?
My answer I thought would be to link L1 - CPC at the motor and measure L1 – CPC at the isolator and repeat again with L2 and L3 to CPC. (But this is then a R1 + R2 test and not a separate R1 and R2 test)
So if I wanted to measure only R1 would I have to link all phases at motor together using a croc clip and all phases at isolator using the other croc clip?
And for R2 measure CPC from motor to CPC to isolator?
Or am i completly loosing my mind, lol
Thanks
I know this has been discussed many times throughout this forum and other websites but I just can’t get my head round the testing of a 3 phase supply connected to a 3 phase isolator and a DOL starter/motor. There could also be a 3 phase socket.
After finding many solutions I’m finding it difficult to interpret some jargon and some written English literature, apologies to those that I have offended at his stage! It could be just my lack of experience of current electrical jargon and abbreviations.
I know how to measure my R1 + R2 from DB and motor by simply linking between L1 + CPC at DB then measure L1 + CPC at the motor and then repeat the steps with L2 and L3.
I’ve read that I would have to do a separate R1 and R2 from motor to isolator? But I presume you could measure from DB to isolator using the steps outlined above, link L1 – CPC at DB and L1 – CPC at isolator to get R1 + R2 and so on and add the readings of the motors (R1 + R2) and the isolators readings (R1 + R2) together to get the overall (R1 + R2).
If I’m wrong and you have to do a separate R1 and R2 from isolator and motor how would I go about doing this?
My answer I thought would be to link L1 - CPC at the motor and measure L1 – CPC at the isolator and repeat again with L2 and L3 to CPC. (But this is then a R1 + R2 test and not a separate R1 and R2 test)
So if I wanted to measure only R1 would I have to link all phases at motor together using a croc clip and all phases at isolator using the other croc clip?
And for R2 measure CPC from motor to CPC to isolator?
Or am i completly loosing my mind, lol
Thanks