I have a 240 volt 225 amp sub-panel. Both lines attached to the bus bar have 120v.
When I turn on any breaker connected to one of the bus bars, the voltage drops to 80-108v. If I remove the load and then turn on the breaker, I have 120v.
All breakers on the other bus bar when turned on do not affect the voltage. It remains at 120v.
Any idea what the issue is, as it doesn't seem to be the wire, the panel or the breakers.