US split phase monitoring requirements

Except for the fact that US residential kWh meters don’t use the neutral leg.

Here’s a couple of pics of the socket side of a meter typical of US residential electrical service:

Two contacts connect to the source, the other two to the load center. (circuit breaker panel)

Believe it or not, that happens more often than one would think. It tends to be fairly short lived though
as it manifests itself in lights that either flicker between brightness levels, or lights that are quite a bit
brighter in one part of a house and at normal brightness in the rest of the building. The occupant of
said building usually wastes little or no time in contacting the electrical utility to report the problem, if for no other reason that it can be really aggravating.

A poor bond to the neutral at the service entrance will make the lights in the entire building do the brightness “dance” whereas a bad neutral bond in a load center will cause the problem to happen on the circuit the neutral belongs to. I’ve a friend who is the electrical superintendent of the city he lives in and he’s told me they replace faulty service entrance neutral bonds about once every one to two months.