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Low Earth Orbit
Lighting & Electrical
Lighting system causes buzz/hum in the circuit breaker panels
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<blockquote data-quote="Mike Sokol" data-source="post: 58976" data-attributes="member: 1989"><p>Re: Lighting system causes buzz/hum in the circuit breaker panels</p><p></p><p>Great post!!! Some of the nastiest power I've ever used was in old warehouses converted to clubs. Of course they never ran new power panels or distro since the old ones had so much amperage. Without a dual trace o'scope you can't measure the difference between two legs of 120/240 with a 180 degree phase shift (single phase) and 120 degrees phase shift on two legs of a High-Leg Delta feed, since they both measure the same with a DMM. Standard WYE connections read 208 volts leg to leg and 120 volts neutral to any hot leg so you have a hint you're on two legs of 3-phase power.</p></blockquote><p></p>
[QUOTE="Mike Sokol, post: 58976, member: 1989"] Re: Lighting system causes buzz/hum in the circuit breaker panels Great post!!! Some of the nastiest power I've ever used was in old warehouses converted to clubs. Of course they never ran new power panels or distro since the old ones had so much amperage. Without a dual trace o'scope you can't measure the difference between two legs of 120/240 with a 180 degree phase shift (single phase) and 120 degrees phase shift on two legs of a High-Leg Delta feed, since they both measure the same with a DMM. Standard WYE connections read 208 volts leg to leg and 120 volts neutral to any hot leg so you have a hint you're on two legs of 3-phase power. [/QUOTE]
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Lighting system causes buzz/hum in the circuit breaker panels
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