No country in the world uses 138 volts. They use 100, 110, 115, 120, 127, 210, 220, & 240.
210
It is a electrical code rule taken from the National Electrical Code book. It has to do with multi wire branch circuits.
No. You aren't allowed to install a device rated greater than the circuit is rated.The 20 amp receptacle would allow you to plug in 20 amp loads (which is why it is different than a 15 amp receptacle), and plugging a 20 amp load into a 15 amp circuit would cause an overload and the 15 amp circuit breaker would trip.ADDITIONThis may still be open for discussion. According an electrician from RKO Electric, you can in fact install a 20 Amp GFCI receptacle on a 15 Amp breaker. Apparently, the breaker will trip well before the receptacle is able to pull 20 Amps of current into the line. Please see the following link from another website: http://en.allexperts.com/q/Electrical-Wiring-Home-1734/20-amp-GFCI-outlets.htm2003 NEC Code Book says:210-21(b)(1), p.70-42: A single receptacle on an individual branch circuit shall have an ampere rating of not less than that of the branch circuit. To me this indicates that if there's only one receptacle on the circuit, you can't have an outlet rated for less than the circuit, but it neither mentions nor prohibits oversizing the receptacle.210-21(3), p.70-42: Where connected to a branch circuit supplying two or more receptacles or outlets, receptacle ratings shall conform to the values listed in table 210-21(b)(3)... which says: 15amp circuit, not over15amp receptacle (
3/0 copper wire with 90 degree insulation is rated at 210 amps. 75 degree insulation is rated at 200 amps.
210 + 110 = 320
160 is exactly in the middle of 110 and 210.
110
A 210-volt outlet is not a standard voltage for residential use in most regions. Typical household outlets are either 120 volts or 240 volts. It is possible that a 210-volt outlet may be used in certain commercial or industrial settings for specific equipment or machinery that requires this voltage level. It is essential to consult with a licensed electrician before attempting to use or modify any electrical outlet.
The GCF is: 10
In order of magnitude (size), your list is:110,111,111,210,210,210therefore, the median (middle) value is (111+210)/2 = 160.5
the answer is 210
210 in a percentage = 210 *100% = 21000%
210
420 - 210 = 210 630 - 420 = 210 840 - 630 = 210
1.05
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