AKsparky1
Member
- Location
- Anchorage, Alaska
I am looking for insulation resistance testing standards for power conductors. At my job we build pre-manufactured wood frame motels and man camps here in Alaska and we mostly install MC cable THHN sometimes XHHW 600v rated and we test all runs of cable before conducting a power test. We use 2.2 G ohms as a standard but sometimes cannot get that high of a reading do to the cable being encased in spray foam. My question is what is the minimum standard for this wire? I believe it is much lower then the 2.2 G ohms but where can I find the formal standard? I checked IEEE 43-1974 but that is for windings for machinery I believe.