Never seen this before and I’m reporting it as a defect, but what’s the implication here?
This was in a 1929 Condo building, and the electrical has been updated. Tthe sub in the apartment was modern with AFCI breakers and a perfect install, but then I get down to the basement to look at the remote service panel and see this.
Meter directly below the service panel, and the only wires feeding the main were 1 ungrounded wire (red) and1 grounded wire (white). The hot conductor was connected to the main breaker and under that termination was another black wire that looped right to the other pole on the main breaker. There is only one other double breaker in the panel (above the main breaker), and it is the disconnect feeding the sub panel in the apartment. Those connections were fine.
Is the following statement correct?
This is 120V service and by looping to the other pole on the breaker, it would power the other bus and this way the breaker for the sub believes it is “receiving” 240 volts.
Is there anyway this is safe?
Is the “double-tap” on the upper pole of the main breaker a safety hazard?
What is the fix if there are only 2 wires coming from the meter?
None of this looks right so I am going to report it as such and recommend an electrician, but I’d like to understand it more and I’d also like to know if there is anyway I’m mistaken.