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What size wire does a 70 amp breaker require?
A breaker is sized by the conductor that is connected to it but also the load that is connected to the breaker. There are some cases such as motor loads where the breaker has to be 250% of the motors full nameplate amperage.A #4 aluminium conductor with an insulation factor of 90 degrees C is rated for 75 amps.
What size wire for a 30 amp breaker to ac?
A # 10 wire with a insulation factor of 75 or 90 degrees C are both rated at 30 amps.
Can you use ten gauge wire on a compressor rated at thirty three amps?
Assuming that the motor is single phase 3 HP operating on 120 volts. A couple of things come into play on this installation. One it is a motor load. Code states that motor loads have to have feeders rated at 125% of the motors full load amps (FLA). The other condition is breaker sizing. With a motor amperage of 33 amps and using a feeder of 125% means 33 x 125% or 1.25 = 41.25 amps for wire sizing. A #10 copper wire with an insulation rating of 60, 75, or 90 degrees C is rated at 30 amps, this does not fall within the required wire size. A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps, this falls within the required wire size. Breaker sizing is taken from the motors FLA. For a motor with 34 amps full load, a 110 amp non time delay fuse, 60 amp time delay "D" fuse or a 70 amp breaker is required to meet code regulations. The reason for over sizing the breaker or fuses is to overcome the motor high current, which can rise to 300% of the motor's FLA, on start up.
What size of wire and breaker do you need for a 10 KW electric furnace?
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.
What size wire do you need for a 3 phase 80 amp breaker circuits is used for ballpark lighting?
A #4 copper conductor with an insulation factor of 75 and 90 degrees C are both rated at 85 amps.
What size breaker for 12 gauge aluminum wire?
A #12 aluminium conductor with an insulation factor of 75 or 90 degrees C is rated at 15 amp. Therefore the largest size breaker to protect that wire will be a breaker rated at 15 amps.
What size wire does a 70 amp breaker require?
A breaker is sized by the conductor that is connected to it but also the load that is connected to the breaker. There are some cases such as motor loads where the breaker has to be 250% of the motors full nameplate amperage.A #4 aluminium conductor with an insulation factor of 90 degrees C is rated for 75 amps.
What size wire for a 30 amp breaker to ac?
A # 10 wire with a insulation factor of 75 or 90 degrees C are both rated at 30 amps.
What size of breaker is use for 75 horsepower 220 volts 3 phase induction motor?
500 amp breaker with 250 mcm cu conductors, NEC list this motor as drawing 192 amps X 250% = 480amps go to the next standard size of breaker which would be a 500.
What size wire for 75 feet of wire for a 30 amp 220 volt oven?
A 30 amp breaker run 75 feet would require you use AWG #10 wire. But, an oven normally pulls more that 30 amps and I would not use #10 wire on a 30 amp breaker for an oven. Normally any newer oven is wired with AWG #6 gauge wire on a 50 amp circuit breaker so the breaker will not trip during heavy use of the oven. Some older ovens could use a #8 wire on a 40 amp breaker.
What size wire for a 40 amp breaker?
A 40 amp breaker is used in conjunction with AWG # 8 copper wire. The black and red wires are connected to the breaker. The ground wire is connected to the ground bar and the white wire is connected to the neutral bar.
Can you use ten gauge wire on a compressor rated at thirty three amps?
Assuming that the motor is single phase 3 HP operating on 120 volts. A couple of things come into play on this installation. One it is a motor load. Code states that motor loads have to have feeders rated at 125% of the motors full load amps (FLA). The other condition is breaker sizing. With a motor amperage of 33 amps and using a feeder of 125% means 33 x 125% or 1.25 = 41.25 amps for wire sizing. A #10 copper wire with an insulation rating of 60, 75, or 90 degrees C is rated at 30 amps, this does not fall within the required wire size. A #8 copper wire with an insulation factor of 75 or 90 degrees C is rated at 45 amps, this falls within the required wire size. Breaker sizing is taken from the motors FLA. For a motor with 34 amps full load, a 110 amp non time delay fuse, 60 amp time delay "D" fuse or a 70 amp breaker is required to meet code regulations. The reason for over sizing the breaker or fuses is to overcome the motor high current, which can rise to 300% of the motor's FLA, on start up.
What size of wire and breaker do you need for a 10 KW electric furnace?
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.
What size wire do you need for a 3 phase 80 amp breaker circuits is used for ballpark lighting?
A #4 copper conductor with an insulation factor of 75 and 90 degrees C are both rated at 85 amps.
What is the selection procedure for fuse wire for motor load?
An easy way to do this is to get yourself an "Ugly's" book. Its a small electrical reference guide for circuit protection, (sold at Home Depot & some electrical supply houses). Buss, and other fuse makers usually can supply you with a similar guide.You will also need to find the right size Motor Starter & Overload Heater within the Motor Starter. But to answer your question;To select wire, or fuse/breakers for a Motor Load, you need to look at the Motor's FLA (Full Load Amps), take that number and multiply it by 1.25 (this is a 'rule of thumb' & not Absolutely necessary),-Now you have the maximum amperage that the motor will draw under NORMAL OPERATING CONDITIONS. Go to the NEC section on conductors (i.e. wires) and find a suitable gage wire (in the 75 deg column) and find a wire that will handle the amount of current the your load requires.Now find a fuse or breaker that is permitted for the WIRE, not the load.For example: if you have a motor that draws 10 amps (full load), you might use 16 gage wire, 16 gage wire may be rated for 20A, use a breaker, or fuse rated for 20A.Its always best to use the lowest temperature column in the NEC book because you have to account for all connections in the circuit (i.e. lugs, crimps, spades, terminal blocks, etc.)YOU NEED TO SELECT A FUSE, OR BREAKER BASED ON THE WIRE SIZE, NOT THE LOAD ! !
What size wiring is required for 240 volt air conditioner?
It depends on the size and efficiency of the unit. Look on the service plate on the unit. It's a sticker the manufacturer puts on. It will have the model and serial number and a max fuse/breaker rating. This will tell you what breaker can be used with that specific unit.
What size of wire use and breaker for a 30 hp 220 volt 3 phase compressor?
Wire size calculations and breaker sizing are based on the motors amperage. If the amperage is not known the electrical code book rating are used by electricians. The book states that a three phase 30 HP motor draws 80 amps. An 80 amp motor needs a conductor rated at 100 amps. A #3 copper conductor with an insulation factor of 75 or 90 degrees C is rated at 100 and 115 amps respectively. Non time delay fuses rated at 225 amps, time delay fused rated at 125 amps or a breaker rated at 200 amps. These figures can probably be reduced if the actual motors amperage rating is used in the calculation.
