Discuss 3 Phase Insulation Resistance Test on motor & TP & N skt help in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
Im useless at writing method statements for these things. Its alright in my head but useless when on paper.
I do recall there being somegood vids for this on youtube... Chris whats his name the guy who writes a lot of textbooks did them. I assume they still float around youtube....
Looking for some advice on how to carry out a IR test on a 3-phase motor and a TP & N skt, these are parts of a module I have failed on a test and am looking to see where I am going wrong and what the normal procedure for carrying out this test would be?
If you are I.R. testing the motor why can you not test all three phases to earth at the same time ?
sorry should have been more specific the 3 phase skt is a complete separate circuit from the motor and it is controlled by an isolator switch above it.
I carried out the following procedure at board for motor circuit (with incoming cables to motor disconnected) and for 3 phase socket circuit,
L1 - L2
L1 - L3
L2-3
L1 - N
L2 - N
L3 - N
L1 - E
L2 - E
L3 - E
I think what I missed out on was IR testing the outgoing SWA cable down to the motor.
Also, the isolator switch above the 3 phase skt was left in the on position aswell which I'm not sure would affect the outcome of the test?
Very unlikely that the 3 phase motor would have any Neutral connections?
Not always necessary to have a N at the starter could be a 400v coil,. but in answer to your question the AM2 is totally Alien to me. Could also be a completely different circuit from the Motor circuit, although I thought rightly or wrongly the OP was IR testing the Motor, could be I misread the post. I suppose in real life you would have the socket as close as possible to the actual motor, after the starter, so no N ,but as this is a testing facility for trainees I can see where the N at the socket would be required, may be this could send out the wrong signals to people who have no or very little 3 phase experience, something for the training establishments could think about, back to the motor, the OP was asking how to IR test a TP Motor, confusion may have set in at that juncture.The TPN socket does.
If the motor CCT is anything like the AM2 setup then it will have a neutral brought in to the DOL starter.
Not always necessary to have a N at the starter could be a 400v coil,. but in answer to your question the AM2 is totally Alien to me. Could also be a completely different circuit from the Motor circuit, although I thought rightly or wrongly the OP was IR testing the Motor, could be I misread the post.
Reply to 3 Phase Insulation Resistance Test on motor & TP & N skt help in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net
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