In a remote studio have a Sub-Pannel with Multimeter readings. With No Circuit Breakers In Place (L1 to N 120v) (L2 to N 120v) (L1 to G 120v) (L2 to G 120v) (L1 to L2 240v) (N to G 0v)
slim type circuit breakers (4 singles are for 120v) (2 doubles are for 240v) dryer and air conditioner
with all circuit breakers ON I found (L1 to N 240v)(L1 to G 240v) while the other L2 drops to 0v if i cutoff a certain breaker i find the problem to become vice versa (L2 to N 240v)(L2 to G 240v) L1 drops to 0v
My regular wall outlets show HOT to Neutral 240v
This problem raised out of the blue. All circuits had normal readings prior to 1 day ago and have not changed in 5 years. Had another electrician observe situation and was also stumped with no idea.