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For single-phase supplies, 120 v or 230 v or 240 v. For larger buildings with a three-phase supply, 208 v or 400 v, 415 v or 480 v. For very large buildings higher voltages e.g. 3.3 kV, 11 kV, or for huge factories 33 kV. In special cases buildings needing an unusual amount of power are fed at 110 kV.

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9y ago
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15y ago

It depends a lot on what part of the world you live in. In the US, 480/277V and 208/120V, 60 Hz, three-phase power is two common systems we see.

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13y ago

it is normally 110 but check your appliances some still call for 220

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Q: What are 3 voltages common in commercial buildings today?
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