I've got a 70 year old house with an old garage (not sure how old the garage is). The wiring is the black fabric kind. Somehow my outlet tester says the circuit is "kind of" grounded - how is that possible?
DETAILS:
Somebody installed a 3-prong receptacle for the garage door opener, so I stuck the outlet tester in there. It showed the 2 amber lights for "Correct." I was surprised and looked closer, but there's no ground wire anywhere... With the garage door opener unplugged, the tester shows "open ground."
It turns out that when the garage door opener is plugged in, the receptacle seems to be grounded - but only slightly. This is the first time I used the outlet tester... Took it inside the house (which is properly wired) to test and noticed that in the garage, the second amber light is dim. But in the house, both amber lights are bright.
Are garage door openers grounded, or is something else going on?
Thank you.
DETAILS:
Somebody installed a 3-prong receptacle for the garage door opener, so I stuck the outlet tester in there. It showed the 2 amber lights for "Correct." I was surprised and looked closer, but there's no ground wire anywhere... With the garage door opener unplugged, the tester shows "open ground."
It turns out that when the garage door opener is plugged in, the receptacle seems to be grounded - but only slightly. This is the first time I used the outlet tester... Took it inside the house (which is properly wired) to test and noticed that in the garage, the second amber light is dim. But in the house, both amber lights are bright.
Are garage door openers grounded, or is something else going on?
Thank you.