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I had a similar problem a few years back in MN at a Casino. It was Hot day and the Electric was curtailed as the casino was running on their Generation. So I first thought it was somewhere on their system. When they switched back to the utility system, I had the same problem. The Electrician came out, Measured the open circuit voltage at the closed 50 amp breaker, 240 volt and 120, 120. They had a small load box and plugged into the pedestal and one side of the 240 was dead.
BAD BREAKER. I ohmed the the breaker connects and did get a resistance on the bad pole. I was surprised the breaker didn't really hot.
Clay
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