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What size of wire and breaker do you need for a 10 KW electric furnace?
Wiki User
∙ 7y ago
To answer this question, wire size is rated in the amount of amperage that it can legally carry. The formula to find amperage when the HP is known is I = HP x 746/1.73 x E x %eff x pf.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
Amps = 10 x 746 = 7460 = 7460/1.73 x 220 x .84 x .86 = 7460/275 = 27.1 amps.
The electrical code states that a motor conductor has to be rated at 125% of the motors full load amperage. 27.1 x 125% = 33.8
A #8 copper conductor with an insulation factor of 60, 75 or 90 degrees C is rated at 40, 50 and 55 amps respectively.
Wiki User
∙ 10y ago
Wiki User
∙ 13y agoNEC motor table list this motor as drawing 16 amps, that would require wire size of # 12 copper.(16 amps X1.25=20) The breaker for this motor should be a 40 amp.(16 amps X 2.50=40) This allows for the high starting currents.
Wiki User
∙ 14y agoThe current load of a 10 HP motor should be taken from the motors nameplate. It is this amperage that the wire size is calculated from. The code book states that a 10HP motor draws 50 amps at 230 volts. Motor overload protection of the code states that for 50 amps you need a conductor capacity of 62.5 amps. Fusing at 150 amps, time delay fusing at 90 amps or a breaker of 125 amps. The wire size you would need to wire this motor to code would be #4 copper with a wire insulation factor of 75 or 90 degrees C. This #4 wire capacity is 65 amps.
Wiki User
∙ 10y agoThe breaker sizing will be governed by the size of the motor's full load amps. The wire used to feed the motor is based on the voltage of the motors full load amperage. Either the motor's full load amps or the motor's voltage have to be stated to calculate an answer this question.
Wiki User
∙ 15y agoi need to know the voltage and if its single phase or three phase
Wiki User
∙ 11y agoIt's 100ft away and its 120 voltage
Yemi Omotayo
Three phase motor
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What size of wire and breaker do you need for a 20kw electric furnace?
In order to properly size the wire per National Electric Code (NEC) standards you will need to know the amperage and the distance of the device (heater) from the source (circuit breaker panel). In order to know the amperage one would need to know the voltage since amperage changes inversely with voltage.
Installing a 120volt appliance what breaker is needed at the electric box?
Need to know what the wattage or the amperage is of the appliance. The load amperage is what governs the wire size and the breaker to protect the circuit.
What Size breaker for 6 gauge wire?
You need a 60 amp breaker.
Can I you use existing 8 3 wire hooked to a 30amp breaker was hooked to old electric heater to wire a heater that requires 10 2 wire its a 5000watt 240volt heater?
Yes the wire size is larger for that size breaker but will not effect the 30 amp breaker protection of that circuit.
What is the breaker size for a 10 KVA electric heater?
What size breakers are needed for a 30kva transformer 208 volt feed 600 volt out put
What size circuit breaker for electric furnace?
67,500 BTU electric furnace
Why do you need a 125 amp breaker for a 83 amp furnace?
If you put a 85 amp breaker in there it will overheat from the starting and stopping of the motor. The extra size of the breaker insures that the furnace will run without interruption and without overheating the breaker. And electric motor can draw three times the amperage rated on start up momentarily. This is why there is need of extra amperage ratings.
What size breaker do you use for a furnace?
It depends on the rating of the furnace. There should be a plate or sticker somewhere on the furnace that shows the rating. If you are just powering a blower motor the rating will be lower than if you have an electric heating element.
What size of wire and breaker do you need for a 20kw electric furnace?
In order to properly size the wire per National Electric Code (NEC) standards you will need to know the amperage and the distance of the device (heater) from the source (circuit breaker panel). In order to know the amperage one would need to know the voltage since amperage changes inversely with voltage.
What size wire and breaker for a 240 volt single phase 20 kw electric furnace rated at 83.3 amps?
AWG #3 copper.
What size furnace do you need for your house?
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What size breaker do you need for a 40 gallon electric water heater?
Usually 30 amp
What size furnace do I need?
The size of the furnace depends on the square footage of the house you are heating.
Installing a 120volt appliance what breaker is needed at the electric box?
Need to know what the wattage or the amperage is of the appliance. The load amperage is what governs the wire size and the breaker to protect the circuit.
What size breaker do you need for 9000W at 440V 3 phase delta?
50amp but if considering the breaker cannot withstand starting current you need to size the breaker up.
What Size breaker for 6 gauge wire?
You need a 60 amp breaker.
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