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  1. General Electrical Discussion
    Two questions. The first: The dryer I'm looking at draws 43a at 240v. There are two hot wires and a ground. Does the dryer draw 43a @ 120v or does it draw 21.5a @ 120v from each hot wire? Second question: All I want to know is the conditions under which a main circuit breaker trips. Assuming...
  2. General Electrical Discussion
    Hi everyone, I have been scheduled to commence my first power shut down this upcoming week at a multi-residential property. I have witnessed a few shut downs before and seen the electricians "power shed" by shutting off all the loads individually before disconnecting the main breaker. However...
  3. General Electrical Discussion
    Short circuit on a 20A lighting circuit and it shut down the whole building!! What would have caused this to happen? Why did none of the other breakers in the series trip? Guessing the trip settings on the existing main were dialed down way too low? Needless to say, my guys had a stressful...
  4. Commercial Electrical Forum
    Scope of project: Install 240V circuit in sub-panel for stage lighting requirement. Problem: We don't know which meter powers which interior panel. Building has 3 exterior meters and 3 interior breaker panels. The interior panels do not have mains, so the only way to kill the power to the...
  5. Services and Service Equipment
    I am actually doing this service upgrade at my house. (Getting rid of my old OH setup) The city is requiring me to use a main breaker disconnect at the meter. The meter pedestal that the supplier send was the Milbank NU8980-O-200-KK. As soon as I opened it, it looked questionable. Now I...
  6. General Electrical Discussion
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  7. Services and Service Equipment
    I recently went out to a customer and the call was that they lost power to the building. Before I arrived, they already found the problem breaker, turned it off, and reset the 1200A GFCI main. The problem was a 70A RTU branch ckt. A compressor had a ground fault that caused the main to trip...
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