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What is an electrical service mast?
A service mast is attached to the building, it stands normally above the building or at the highest point of the building, were no one can get to it. The service mast contains the wires from the meter base to the top of the service mast, this is were the power company attaches it wires so that the building has electricity.
Can the electrical panel be installed above a base kitchen cabinet or does the floor space in front of the panel have to be open?
No, you should not install anything in front or below the panel. You must have 36" of free space in front of the panel and 30" on either side of the panel.
What is meggers?
A megger is an electrical instrument that is used to measure the resistance of insulation by applying a DC voltage to the conductor. One lead is connected to the conductor and the other lead is connected to ground. Safe insulation reading to ground should be above 2,000,000 ohms or 2 megs.
How do you install a 3 phase electrical service?
The same as a split single phase service, except with 3 phase panelboards, and the size of the service equipment can differ greatly. If the service voltage is 480v, you'll have to install your own transformers to use 120v equipment. I'm not sure as to the purpose of this question. If you're trying to do it yourself, you probably shouldn't have to ask how. It's a pretty large thing to do. If you're just curious, the above answer should suffice.
How high above a electrical panel can you install a gas furnace?
It is different in different states. You are dealing with 2 separate codes here. HVAC & Electric codes. Contact both your electrical inspector and whoever inspects gas HVAC for a definite answer.
