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HOW DO I install a 3 phase generater to an mcc to automatically change over to generater power in the event of a mains power failure?

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You would need a three phase automatic transfer switch.

Your local electric company usually requires you the have these automatic transfer switches install by a license electrician.

Posted on Dec 03, 2014

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I bought a 1999 Jayco 5th Wheel model 3310RLS. I got the generator running and when I cut if off the system does not switch back to normal electrical power?


call in an electrician
it could have an automatic relay control that prevents both gen set and mains power operating at the same time ( phasing cycle out of sync destroys the genset ) or may require you to manually reset from get set to mains power
take it to a jayco service center and have it checked out

Aug 06, 2016 | RVs

1 Answer

Where can i obtain a wiring diagram


A one phase 3 wire system has a center tap. Two hots and a neutral. Typical 120/240 volts.
A three phase 4 wire system has Three hots in a Y or Delta. The Y system has three hots and the neutral comes from the center of the Y, this is the neutral and grounded conductor, 120 volts from hot to ground and 208 volts hot to hot. In a 3 phase system the voltage is not doubled hot to hot as in a single phase system because the hots are 120 degrees phased from each other and the square root of 3 is the factor, multiply the 120 volts by 1.73 to get 208 volts hot to hot. Multiply 208 by the reciprocal of 1.73 and get 120 volts. Your exact application is not given so it is not known. A delta system is a triangle and the angle of each triangle is a hot wire, one angle would be grounded or the center tap of one of the sides of the triangle. Y is the configuration of the windings of the alternator or transformer and Delta is the configuration as a triangle of the windings of the alternator or transformer where the power supply is.

With a three phase home service, you can only connect two hots from your single phase generator, and the neutral. One of the house's hot does not get connected and any three phase loads in the house should be switched off and kept from energyzing or a circuit breaker or fuse serving that 3 phase load may trip.
Only one power supply can be connected at a time. The power company power must not be connected at all while using an alternate power supply unless your power supply has means to synchronize the alternating cycle.

It is adviced that the loads be kept within 10% of their rated voltage, especially motors.

May 04, 2015 | Heating & Cooling

1 Answer

I purchased a generac 22 kw 3 phase 120/240 volt generator. I was surprised to find that it had a wild leg. Can i change the leads on the stator output to eliminate the high leg and get straight 120/208...


This unit is wired 120-240V 3 phase Delta. if you are using on it 120/208V 3 phase application it will need to be re-tapped. If you are using it in a home 120-240V single phase it will need re-tapping, Do NOT just use 2 legs, as this will cause rotor imbalance and wear out the rotor bearings, and odd ball currents to flow. If there are 12 leads coming off the stator it can be reconnected. If not you are stuck with it, except by using a transformer

Dec 15, 2013 | Generac Generator QT02224JNAX QuietSource...

1 Answer

Automatic transfer switch not transfering power to home


YOU MAY WANT TO CHECK THE RELAYS THAT ARE IN THE TRANSFER BOX

Dec 15, 2013 | Generac Guardian 200-Amp Automatic...

1 Answer

My power washer has A 5 HP, 7 AMP 3 PHASE MOTOR. I am starting a mobile power wash business, and need to be able to run it off a generator with 220v power. can I find a motor to change it over with, and...


You never mentioned the voltage on your present power washer except it is a 5HP, 7 Amp , 3 phase one. There are no issues if the washer is 220-230 mains power and all you need is a generator which can deliver about 10-15 amps at 220 volt.

Oct 03, 2013 | Washing Machines

1 Answer

I have a Taylor Perkins 150 KW generator on chicken houses. It will start on manual but not on automatic. Once started manually it won't transfer thru transfer switch.


Go the transfer switch and locate the 2 DC control wires that go to your generator for remote start.(On the remote start terminals) If you jumper these wires in the transfer switch and it starts, then the problem is with the transfer switch. If it still won't start check the wiring from the switch back to the generator, if all ok then suspect the generator control board. I would recommend you have an electrician do this, as there is line utility power in the switch and is dangerous !

Sep 21, 2013 | Taylor Cutler Hammer 3-Phase,...

1 Answer

I have Calandar Creator 10 and have created a family calandar which I use from year to year that includes birthday events, holidays etc. and phases of the moon. This year, when I went from Dec. 2010 to...


Calendar Creator 10 has the four moon phases from Jan 1990 thru Dec 2010. To extend past 2010:
- File Open Collection ' Local Disk(c:)'Program Files'Calendar Creator' Template'Events'Phases of the Moon.bcc
-For each of the four events (First Quarter, Full Moon, Last Quarter, and New Moon) change the Repeat Until date past 12/31/2010 to 12/31 of the year you will add data for
-For each of the four events, click Advanced Repeat Rule you can selete the drop down under Exceptions / Pick exception and there you can see the dates by month and year from Jan 1990 thru Dec 2010 for the event. You need to extend this list. First obtain the moon phases from some web site like www.timeanddate.com/calendar. (note that this site calculates the mone phases base on New York time). The simply select each of the dates for the event you are modifying by clicking that date on the calendar in the upper right hand of the screen. Just advance the calendar thru the months and years you want to enter data for. You can check the list when finished by selection the ExceptionS Pick exception drop down box.
- Save your changes by clicking OK and Ok again. Make changes for all for events.
- Select File and Save Collection
- You need to replace the Phases of the moon events in your calendar by removing the old events and importing the new events. To remove the old Phases of the moon in your calendar, select Events'Categories highlight Phases of the moon and delete. Then add back the changed events by File'Import Events and browse for the Phases of the moon.bcc file you changed.
I hope this gets you what you need.

Nov 19, 2010 | Broderbund Calendar Creator Deluxe 10 Full...

2 Answers

I have a generator with a GE 3pole 100 amp main breaker its # 1-2-3 from left to right i'm using a 10ft piece 223 alum wire to hook it to the breaker panel my problem is the panel is a 100 amp square D...


the 1 and 3 poles, the 2nd is used for more a 3phase system, hooking up say 1 and 2 wont give you 120v. test with a volt meter to confirm but if your looking for 240 you need to use 1 and 3

Nov 06, 2009 | Electrical Supplies

1 Answer

Matching a generator to a motor


You need a e 3 phase generator to run a 3 phase pump first of all. Check to see that the generator is three phase. Most are not.

Jan 18, 2009 | Electrical Supplies

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