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Which countries use 138 volts?
No country in the world uses 138 volts. They use 100, 110, 115, 120, 127, 210, 220, & 240.
What temperature switch for electric fans is needed for a 195 degree thermostat?
210
What is NEC 210-4B?
It is a electrical code rule taken from the National Electrical Code book. It has to do with multi wire branch circuits.
Can you use a 15amp outlet on a 20amp circuit?
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 (
What size of triplex should be installed in the air for 200 amps?
A #2/0 triplex with an insulation factor of NS75 is rated at 210 amps. A #1/0 triplex with an insulation factor of NS90 is rated at 220 amps.
