Answer for USA, Canada and countries running a 60 Hz supply service.
The equation for amperage is Amps = Watts/Volts. As you can see the voltage is needed to give an answer.
Assuming that this is a home electric furnace and not a commercial or industrial furnace, the voltage of 240 single phase will be used.
Using the above equation A = 10000/240 = 41.6 amps. The conductors have to be rated at 125% of the devices amperage. This is 52 amps.
A #8 copper conductor with an insulation factor of 90 degrees C is rated at 55 amps. The breaker to feed this installation should be a 50 amp breaker.
As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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The kilowatt power draw of the electric furnace can be calculated using the formula: Power (kW) = Current (A) x Voltage (V) / 1000. Plugging in the values (20 A and 240 V) into the formula, we get: Power = 20 A x 240 V / 1000 = 4.8 kW. Therefore, the electric furnace has a power draw of 4.8 kilowatts.
4 amps is a unit of electric current that measures the rate of flow of electric charge. It is equivalent to 4 coulombs of charge passing through a point in a circuit per second. Amps are commonly used to measure the strength of an electric current in a circuit.
Electrical amps, or amperes, are a unit of measurement for electric current. They represent the rate of flow of electric charge in a circuit. One ampere is defined as one coulomb of charge passing through a point in a circuit in one second.
A 10kW heater at 220V would draw approximately 45.45 amps. This can be calculated using the formula: Amps = Watts / Volts. So, 10,000 Watts / 220 Volts = 45.45 amps.
In the electrical trade the only time there is a reference to start and running amps is when dealing with motors. The running amps is always lower than the starting amps. A 78 amp electric furnace will take a 100 amp service for it to operate and be within the electrical code guide lines.