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I have a 3phase electric motor 440 v amps.7.6 and drive thats 440

I have a 3phase motor 440 v amps.7.6 and drive thats 440 v and pulls 7.6 amps what size of breaker and fuses should i have for protection. the drive slows down the motor and or speeds up he motor for purging purposes

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Allowing for start up current I would put a 16amp 3 phase breaker/trip in circuit. If this trips then use a 20amp.

Posted on Aug 01, 2010

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Brand new furnace wont start its a aruf 14 electric air handler with a 10 amp heater coil


the 3 amp fuse protects low voltage side of transformer. if it's blowing on a call for cooling wire pair going to outside unit bad or contactor in outside unit.

Nov 18, 2013 | Goodman Heating & Cooling

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How can i connect a timer switch hager EH 010 to three phase DOL startor. the startor is using for 7.5 HP motor


Copy following links for installations:
http://waterheatertimer.org/How-to-program-Hagar-timer.html#wire
http://waterheatertimer.org/images/EH-010-timer-wiring2.jpg
http://waterheatertimer.org/images/EH-010-timer-wiring.jpg
http://waterheatertimer.org/How-to-install-3-phase-timer.html

EH 010 timer is rated 16 amp max.
Typically this timer is connected to 12-14 gauge wire
Typical 3-phase 7.5 Hp motor draws 22 amps at 230volt and probably connected to 30-40 amp breaker and size 10-6 wire.

Timer and wire to timer must be fuse-protected with 15a bus fuse or line fuse or fuse block, and cannot be directly connected to 30-40 amp line.

Add comment as needed.

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Apr 18, 2013 | Hardware & Accessories

1 Answer

What the codes


You want delay fuse instead of fast-acting fuse. Look for delay on product description.
Since the motor has a high amp draw when first starting, then that means surge of heat traveling over wire.
Fuse trips when sensing heat.
Delay fuse will accept high heat for longer period of time before tripping.

You have 1 Hp 6K321 motor from WW Grainger. You can contact grainger.
http://www.grainger.com/Grainger/DAYTON-General-Purpose-Motor-6K321?Pid=search

I recommend that you use 12 gauge wire and 20 amp fuse. Over-sizing wire will save heat loss and prevent damage to motor, and heat damage fuse box.

If you use smaller 14 gauge wire and 15 amp fuse, the motor will heat the wire, especially if length of wire is longer than 100 feet from fuse.
The motor has thermal protection, so motor is not overheating.
The wire is overheating.
http://waterheatertimer.org/Color-codewire.html
http://waterheatertimer.org/See-inside-main-breaker-box.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Sep 27, 2012 | Dryers

1 Answer

What to do if 30 amp fuse keeps blowing in main breaker box


A 30 amp circuit breaker or fuse is NOT a typical size used for the protection of convenience outlets & general lighting circuits, especially in a residential setting. In fact the National Electrical Code (NEC) prohibits anything larger than a 20 amp breaker to protect a #12 copper wire and and a 15 amp breaker to protect a #14 copper wire. These are the size wires used to supply nearly all outlet and lighting loads in a residence.

It's not clear to me from your question if this 30 amp breaker is a double pole type that is providing power to a second, smaller circuit breaker panel and these outlets are fed from it. This would be in line with what the NEC would allow and what I suspect is the situation. I'm only going to get into this a minimal amount as more information is needed for me to be able talk intelligently about it.

I would shut off the loads that are connected to the 30 amp breaker. If that is a panel, I would shut off all the circuit breakers in it, then turn onn the 30 amp breaker. If it trips, then there is a problem between the 30 amp breaker and the panel. You may have connected line cables to ground or neutral - and vice-versa.

Can you please explain in as much detail as possible what is connected to the 30 amp breaker? Is it a single pole (120 volts) or double pole (240 volts) circuit? What size wires are connect to the breaker terminal(s) What type of cable is connected to it? How many wires are in the cable assembly or pipes? What is the size of wires? If they feeds a second, smaller breaker panel, where do the wires terminate - into lugs on the top or bottom of the panel or terminals of a circuit breaker? What happened or changed to cause this circuit breaker to start tripping? Is this part of a new installation - and if so, was the wiring done by an electrician? Was the work inspected?

Please try to answer as many questions as possible. The more information you can provide will help me get you the best answer.

Jan 19, 2012 | Electric Hammering

4 Answers

I believe I might need to change my (20 amp) breaker switch that is running on 10-2 wire which supplies power to my Rheem Classic 10 Seer. I'm not sure if I need to have 220V of power on a 30amp...


Hello, the unit runs on 220 volts that's why # 10 wire must be used. The best bet is to use a 40amp breaker for 220 volts, gives the circuit more protection.

Sep 04, 2011 | Heating & Cooling

1 Answer

I have a wood planer with a 3HP 220 single phase motor wired to 20amp circuit breaker in my house. I usually run the planer off a 12gauge extention wire about 30ft from the house plug. I would like to...


Look on the planer to see what the R.L.A. are, for example 16.0 amps. Set a box with 2- 20 amp fuses, or a double pole 20 amp breaker. Do not exceed the amperage of what the planer says on its data plate. If the R.L.A. is 10.0 to 19.3, use a 20 amp.
Sincerely,
Shastalaker7

Jan 20, 2011 | Inline 20 amp. In-Line Circuit Breaker

1 Answer

I have a cutler hammer switch box that takes care


Is the motor new or old? Is this a recent problem or has it always been that way? What is the motor used for? Does the motor start and stop a lot, or does it run continuous? Is it constantly under load? Is this residential or commercial use? Approx.how long is the circuit? What size wire and breaker are being used? Does it kick out when it starts or while it's running?
The FLA (Full Load Amps) for that motor is 22 x 1.25 = 28 amps. In GENERAL, a motor like that usually requires a minimum #10 (THHN or THWN) wire on a 30 amp breaker. However, NEC does permit up to a 70 amp breaker (250% of the FLA) if the 30 amp breaker is not sufficient for starting.
Remember that it's the built-in motor overloads that protect the wire. Best practice is to use the lowest size breaker possible for ground fault protection that will still allow the motor to start. A 40 amp breaker would be permissible.
On the other hand, if the circuit is very long, you need to increase the wire size to #8 or larger.
If this is an old motor that didn't have this problem before with your current setup, then you may need a new motor, and increasing the breaker size is not usually the solution, at least not without a qualified electrician actually seeing and evaluating the situation first.



Dec 16, 2009 | Cutler Hammer Electrical Supplies

1 Answer

I want to wire a 3 phase planer up. I have three


install 30 amps 3phase breaker, then wire it up with royal cable 5.5mm x 4wires

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1 Answer

How do I wire a 30amp 3phase 250 volt receptacle for proper phase rotation ie x,y,z on the device with phases a,b,c in the panel?


You will either need a phase rotation meter to identify the rotation, or, if it is a motor, reverse any two leads to spin the motor the opposite direction (this works on single phase, too).

i hope this is helpful
matthew

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