Composite, pinholes in deep south east Texas always a problem with water in conduits... So, are you saying is if I test w/ 500Volts or 1000Volts, and a pin hole exists in dry conduit, chances are the unit will not short to ground w/ megger test or motor running? See I am being blamed by an...
To update... We have been megging wires at this high voltage to guarantee there is no leak in the customers wire. We did not know we were actually not supposed to. We have a wire pull that we megged at such voltage one day it was good, we returned 2 days later and it was bad and the electrician...
Performing our own test now, have had 5000VDC on a 4' wire encased in a 1/2" EMT conduit 3' long for 2 hours no failures.... HMMM Makes one wonder.... One clamp one the wire and one on the conduit..
If I could not find a leak at 550 VDC, move to 1000V, then to 2500V then to 5000V if we did not find a leak, then we call it good. Simple, yet unrefined I am learning..
I have owned a 5000 V megger for over 14 years and , we have megged motors, heat trace, basic wire and cables. we have never had a failure of wire (That I know of). I have never returned to a "megged line" and had to replace it due to this procedure. I understand what all the rules are, but I...
I have been megging basic wires like THHN with a 5000V megger, same with motors, I have never had any problems with insulation breakdown or failure due from megging 600V Wire at this dc voltage level. Does anyone know if it is okay to do this or shall I expect insulation failure every time? We...
