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electrical oddity
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JamesW
May 22, 2020, 8:38:56 AM5/22/20
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Hi All,
I ran into an oddity I can't quite figure out.
A tenants central air conditioner would not turn. Put a digital
voltmeter on the connections -- got 0 volts. Traced the wires to the
fuse box and pulled the cover.
Testing the 220V circuit breaker -- I read between one output lug of the
breaker and the ground lugs. It read 120 volts. Tested the other output
lug and read 120 volts.
Then I read between the two output lugs expecting to see 220 volts but
there was nothing. I changed the breaker, flipped the switch and the A/C
fired right up.
Why was I reading 120V on each lug but nothing across the two hot legs?
I ran into an oddity I can't quite figure out.
A tenants central air conditioner would not turn. Put a digital
voltmeter on the connections -- got 0 volts. Traced the wires to the
fuse box and pulled the cover.
Testing the 220V circuit breaker -- I read between one output lug of the
breaker and the ground lugs. It read 120 volts. Tested the other output
lug and read 120 volts.
Then I read between the two output lugs expecting to see 220 volts but
there was nothing. I changed the breaker, flipped the switch and the A/C
fired right up.
Why was I reading 120V on each lug but nothing across the two hot legs?
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