Electronics > Repair
Question about voltage in U.S. house built in 1890
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Whales:

--- Quote from: niemand on May 14, 2024, 01:39:11 pm --- (Attachment Link)
The 3-slot outlets were tested to have valid ground with this.

--- End quote ---

Do not trust those testers, they make assumptions.  If your testing with a multimeter revealed the ground wiring voltages to be strange then maintain suspicion.
coromonadalix:
same here,  see a master electician NOW   and get everything sorted out    and put an earth rod in the ground .... if there is not

As insurance(s) side  if it was done by an master electrician, and anything bad happens  you'll be covered, if "they learn" you did some job yourself,  you may end with more problems

dont play god please
BrokenYugo:
A 3 light tester only works correctly on single faults, making them mostly useless, it's just 3 neons and 3 resistors. Dangerous compound issues can read all good, e.g. hot-ground reversal+bootleg ground will give a full pass.
niemand:

--- Quote from: bdunham7 on May 14, 2024, 02:04:57 pm ---[...]
Start by taking that cover off so you can see the wiring inside and post a good photo of that.  Carefully, of course.  Is there a grounding rod nearby?
[...]

--- End quote ---
Perhaps this thick painted wire is the grounding rod:










bdunham7:
Can you take a zoomed-out photo so we can see the entire installation including the other boxes nearby?  I'm not seeing any ground wires in the box.  The bus bar where the white wires are going to should be the neutral/ground bond.  There's one big black wire going to that bar at the top, where does that come from?

Also, this looks like a sub-panel, not a main service panel.  There's no main breaker.  Is there any other sort of accessible panel anywhere?  Where does the service entrance come from--overhead or underground?
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