Quote Originally Posted by ZZZ View Post
If you have two 120 volt, 15amp heaters on seperate poles for example, with a shared neutral, the current on the neutral would be zero amps. The same would go for incandescant lamps or any other purely resistive loads.
Theoritically ..... only if the loads on the 2 legs are perfectly balanced ... which is unlikely in real world applications.

As far as damage from a bad connection on the neutral, it is not as likely as damage from a bad connection on the line where the most amperage is flowing. This is why most burned connections are on the main breaker and not on the service neutral.
On branch circuits sharing neutral electronic equipment can be damaged without necessarily seeing burned connections on the main breaker.