Thanks! We did get it tested a week or so later by local NETA certified firm. They got same results. This was their suggestion. Are you saying there is a method to exactly locate where in the line the problem is from either end of 1000LF UG ductbank? How would that help? We would still...
Thanks for your posts! Contractor is going to cut "bad" cable in manhole and megger both ends to see which end is causing low readings then hopefully replace only half of cable and splice replaced cable half in manhole.
1. Is IEEE 525 best source for insulation-resistance (megger) testing procedures & megohm ratings for 600V cables, or some other standard or book guide?
2. What is acceptable megger readings for 600V cables? 1MOhm?, 50MOhm? Does it depend on distance? Other factors?
3. Field question: megger...
