On June 14, 2018 at 02:43, buzz said...
Use an Ohmmeter to check for faults to ground. You could also check for ground loops. A certifier will not pick this up because the cable will be isolated during the test.
We should always remember when we test for shorts that there's an existing connection from all points on the planet to all other points on the planet (unless specifically wired around) and that's the earth.
I've seen power amps fail because an amp out hot lead is shorted to electrical ground through the foil backing of fiberglass insulation. When the tech checked the speaker wires for shorts, he didn't check for shorts to GROUND.
This should always be part of testing for short circuits.
