Home where the h/o was messing w/ his dryer and (likely) shorted power to frame; then got bright/dim condition usually blamed on bad noodle; they all looked ok though it's a 50 y/o system w/ lots of stuff bundled, etc. In the meter base at 1 hot lug was nasty rusted screw head.Line side had no votage difference, but with meter in it avg.150/90, at panel. At any rate the whole affair is a mess (no main breaker, split buss (?) Zinsco.Am doing 100/200a upgrade, now praying it's balanced. Thoughts?
It is a neutral problem...Something I have done is to eliminate the Customers equipment, by taking a piece of #4 thhn & split bolt it onto the POCO's service neutral, & connect it to the panel's neutral bar. If the inbalance is still there, it will be a problem with the POCO's neutral connections. If the inbalance straightens itself out, the hunt begins !!! but You will know that it is inside the Customers equipment. The last time I did this trick, I found the problem went away, & voltage was good. Called the POCO & told them THEY had a open neutral.....found out that a Squirrel had chewed the neutral down to the steel core out on the pole.