Before megging anything that has low voltage boards, modules etc. Remove and isolate wires on both ends. (Only megging wires here) Connect one meter clamp to ground and the other meter clamp to wiring. On this particular megger, hold down test. It will display the applied DC voltage from the megger and the megohm read out. Usually, the megger setting should be double the nameplate voltage rating. Once you let go the button, allow voltage to dissipate before un-clamping. Anything at or below 20 megohms should be considered suspect.

Posted by HVAC Know It All at 2022-08-16 16:21:52 UTC