120V 240V breaker interaction and new range
I just had a new range plugged in (no wiring changes made to 1978 house) The new one was had pigtail wired for three wire 240V to match outlet. (ground connected to neutral inside range)
Soon after I found that the 120V circuit in kitchen would flicker and eventually trip it's 120V breaker. This was not at all load dependent, happens with everything off, doesn't change with everything on.
When the 120V breaker trips the power to the range goes off too, but the 240V breaker for the range is not tripped. If I reset the 120V breaker the range works again. (If I turn off the 240V range breaker the range goes off but nothing else)
The 240V breaker and 120V breaker are not physically near each other in the main electrical panel.
Is this normal that there is a relation between the 120V and 240V like this? Is that a sign of an incorrect wiring job or a failing (neutral?) connection somewhere in the house?
Seems strange this happened just when a new range is plugged in.