joshuablake48
Member
- Location
- All across the country
- Occupation
- Journeyman Electrician
I believe my entire company has been using a megger incorrectly and I would like an answer on whether or not I am correct or not.
We are running superior cable bus with 30 RHW conductors and the tray has a 600kcmil bare aluminum clamped to it so the bus is the EGC.
We are required to Meg all conductors before terminating using fluke megger at 1000v for 1 minute on each conductor. I was told to use another conductor as a common - black lead, the of course red lead on the conductor im megging. I only get a reading that says OL- open line.
My understanding after researching is the black lead would need to be attached to the cable bus in order to read the leaking voltage in the case of damaged insulation. But the cable bus outside does not have the covers on yet so if there is any damaged insulation not right up against the bus the megger will just read open line- so my question is, will a megger properly work if the wire is not in a completely enclosed mettalic Raceway? Shouldn't I be getting an actual number instead of the megger just going to infinity and saying OL? What would the proper way to Meg these conductors if I am doing it incorrectly? Thank you for any assistance.
We are running superior cable bus with 30 RHW conductors and the tray has a 600kcmil bare aluminum clamped to it so the bus is the EGC.
We are required to Meg all conductors before terminating using fluke megger at 1000v for 1 minute on each conductor. I was told to use another conductor as a common - black lead, the of course red lead on the conductor im megging. I only get a reading that says OL- open line.
My understanding after researching is the black lead would need to be attached to the cable bus in order to read the leaking voltage in the case of damaged insulation. But the cable bus outside does not have the covers on yet so if there is any damaged insulation not right up against the bus the megger will just read open line- so my question is, will a megger properly work if the wire is not in a completely enclosed mettalic Raceway? Shouldn't I be getting an actual number instead of the megger just going to infinity and saying OL? What would the proper way to Meg these conductors if I am doing it incorrectly? Thank you for any assistance.
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