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Make sure the wire size of extension cord is AWG 12 or AWG 10. Also circuit must support the 20A at main panel. Standard household extension cords are usually AWG 14 which are not sufficient to carry 20A.
The best extension cord is a short one so that voltage drop does not occur. The cord should be able to reach the supply receptacle and be just long enough to reach the car. Do not use a 50 foot cord and roll it up if the vehicle is just 10 feet away. This cord should have a wire size so that is can handle the load of the block heater. A #12 AWG extension cord will handle a 200 watt block heater very nicely.
The protective device should be rated not more than 10 Amperes and be able to withstand a 1000Ampere short circuit.
depends on the wire gauge and strand type sold strand 12 AWG wire is 50.57 feet per pound. most extension cords however are not solid strand, they are multistrand line which allows for flexibility and breakage. standard size is 28 AWG, 2067 feet per pound. 7 strand 12-3 line gives you 1050 feet of 28 AWG or ~$2 worth of copper if its clean and bare, less if it still in its insulator or if the insulator is burned off.
Yes, 50 ft is ok provided you are using the correct AWG. You can do the following lengths for 30 Amps with a 7000 watt load - AWG - 4 = 300 ft AWG - 6 = 175 ft AWG - 8 = 100 ft AWG - 10 = 75 ft
10 awg
"AWG" in the neighborhood of electrical stuff stands for "American Wire Guage". That's just a standard set of numbers to represent the thickness of wire, used for about the past 150 years. A higher AWG number means thinner wire. If it refers to the wire in the house wiring or the extension cord you're using, then a higher AWG number means that it can deliver less power to outlets or devices than larger wire could. The number of circuits isn't the limiting criterion. The total amount of power supplied to them is.
Not true, If the motor runs fine on the power cord usually # 14 AWG, good for 15 amps, But a longer cord will usually starve the motor for power, which will make the motor heat up due to the low voltage at the motor, which will litterly burn up the motor, if using a longer cord make it a # 12 AWG, good for 20 amps.
It is a parallel pair.
Wire size depends on amps. Use #10 for 30a. #8 for 40 or 50a. #6 for 60a.
Its 16 AWG
12 awg is larger.