StarCat
Industrial Engineering Tech
- Location
- Moab, UT USA
- Occupation
- Imdustrial Engineering Technician - HVACR Electrical and Mechanical Systems
I have dealt with this a few times over the years, and its been difficult except when there is an obvious direct short.
I have another instaance where this may be the case, and may not have access to a Mega Ohm device for any kind of test of said wire.
This is a 3PH-208V service to a 7.5 HP reciprocating air compressor, and there are some known offenders with the machinery itself which can cause the same symptoms of random and unexplained breaker trips whch can also sometimes be hard to nail down. The Mechanic comes around, RESET and everything gives normal readings, sights, and sounds. The known offenders on the machine do not come as suspect in this case. Its a classic Ghost setting.
This is also a case of having solid core wire ont he original pull and a lot of magnetic repulsion on start up heard in the conduit historically. All with starting and running current in the normal range. The last time I came across this problem and identified it for sure was on a 480V 3 PH system, and there was an intermittent arc to ground that could be seen from the end of a conduit run. In this case I am never around when the fault happen.
Would a MEG test in such a case likely be conclusive ?
Any advice is helpful.
Star
I have another instaance where this may be the case, and may not have access to a Mega Ohm device for any kind of test of said wire.
This is a 3PH-208V service to a 7.5 HP reciprocating air compressor, and there are some known offenders with the machinery itself which can cause the same symptoms of random and unexplained breaker trips whch can also sometimes be hard to nail down. The Mechanic comes around, RESET and everything gives normal readings, sights, and sounds. The known offenders on the machine do not come as suspect in this case. Its a classic Ghost setting.
This is also a case of having solid core wire ont he original pull and a lot of magnetic repulsion on start up heard in the conduit historically. All with starting and running current in the normal range. The last time I came across this problem and identified it for sure was on a 480V 3 PH system, and there was an intermittent arc to ground that could be seen from the end of a conduit run. In this case I am never around when the fault happen.
Would a MEG test in such a case likely be conclusive ?
Any advice is helpful.
Star
