Oh, dude, it's like asking how many jelly beans are in a jar. A 200 amp panel typically runs on 240 volts in residential settings. So, like, if you're trying to power up your man cave or whatever, that's the magic number you're looking for.
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In a 200 amp electrical panel, the amperage rating refers to the maximum amount of current that can safely flow through the panel. The voltage rating of a panel is typically standardized at either 120 volts or 240 volts in residential settings. Therefore, without additional information, we cannot determine the exact voltage of a 200 amp panel.
Well, honey, let me break it down for you. A typical residential panel in the US is 120/240 volts. So, a 200 amp panel would also be 120/240 volts. It's like peanut butter and jelly, they just go together.
I assume you are referring to a residential electric panel. The amount of amps has nothing to do with the voltage. They are independent. A typical residential electric panel will have 120 V. That is the easy answer. Usually there are two hot feeds with 120 V to ground. Between the two hot feeds will be 240 V. The bus bars are arranged in the panel so that when you plug in breakers they alternate between the feeds.
In the United States, a lighting panel, which is any panel that contains branch circuits for lighting and usually receptacles, is limited to 42 circuits. Your panel must be rated for the number of circuits you use. There are a lot of panels that hold nowhere near 42 circuits; some hold only a handful.
Yes, the wire size has to be increased. The existing 100 amp service will now probably have a #3 conductor with an insulation factor of 75 or 90 degrees C which is rated for 100 and 105 amps respectively. Increasing to a 150 amp service will use a #1/0 wire size. If you are thinking of an upgrade, skip the 150 amp service and go to a 200 amp panel. New homes are installing 200 amp 42 circuit panels. The extra cost is only reflected in the materials as the labour costs will be the same regardless whether a 150 amp or a 200 amp panel is installed. The wire size for a 200 amp panel is #3/0. With an insulation factor of 75 or 90 degrees C the rating is 200 or 210 amps respectively.
AWG # 3/0 copper.
A 200 amp service panel with a 60 amp sub-panel.
The formula you are looking for is I = W/E. Amps = Watts/Volts.
Judging by your question I'm going to take a guess and say you should probably not attempt to do this yourself. Nor do I recommend it. That being said. You can either have your service upgraded to 200amp, and install a 100amp double pole breaker and branch it off into a 100 amp sub panel. You could most likely re-use your old panel for the 100 amp sub panel. Or... You could have your new 200 amp panel installed in a different location and your current panel wired into it for 100 amps.