How do I test an armored cable (metal jacket cable) to see if it is grounded?

I have several electrical outlets that are not grounded. There are no ground wires running from the circuit breaker. I want to test if the metal box that houses the electric socket connected to an armored cable is grounded.

If you have a Volt Meter or multimeter, you can test with that. Take the outlet cover off & the right slots (small blade slots) on the outlet should be the hot ones.

Stick one of the meter’s probes in the small slot & the other one to the metal box. If you show a voltage, the box is grounded, if not try the other slot, just in case the outlet is wired wrong.

Good luck…

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