usa official voltage satandard (or range)


Old 06-30-10, 08:36 AM
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usa official voltage satandard (or range)

i checked the voltage in several outlets with 3 different meters, one of them is professional grade fluke.....i get reading between 123 and 126.

searching the net, i find several answers: 110+/- 10%, 120+/- 10%. 110-130....

is there a power company or industry standard (nominal and tolerance or range)??

is 126 too high?

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Old 06-30-10, 09:06 AM
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126 volts is fine. A little on the higher side then what you normally see but within tolerances. As you have found, voltage is nominal and will vary. In your case it is 120 volts +\- 10%

The "normal" nominal voltages are 120/208/240, 277/480, 347/600. 120/240 is what you will find in a house. The rest is found in 3 phase systems.

Last edited by Tolyn Ironhand; 06-30-10 at 11:06 AM.
Old 06-30-10, 09:16 AM
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Most places in the USA and Canada are 120V +/- about 10%; 126V is just fine. It will go down as the load in the house increases.
Old 06-30-10, 11:26 AM
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tolyn, ibpooks, thanks for your speedy response. one less thing to worry about
Old 07-01-10, 06:44 AM
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Voltage standards are set or national standards are adopted by state utility commissions. In Indiana, the standard adopted is the national standard, ANSI C84.1. It basically says +/- 5% of nominal (120 V in your case) at the utility meter most of the time. Short duration excursions from this range are allowed. If you are so inclined, you can check with your utility to see if voltage is too high at the meter. 126 volts should not cause anything to fail.
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