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We have an Singer electric heater. It is 480v 3 phase Commercial forced air. I need to know what size breaker need to pull this much power and also I have no instructions for hot ground and nuetral wiring. The colors are brown yellow and orange.

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You cannot hook this thing up unless you have 480v 3 phase service from the power company which you will not have unless you are some kind of industrial operation. There is no neutral involved in 480 3~ only three hots on different phases and a ground for safety. If you do happen to have this kind of power available you should call a professional to do the work for you. Judging by your understanding of electricity based on the question you asked, you will most assuredly kill yourself in the process of trying to hook this thing up.

Posted on Aug 25, 2008

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Can you convert a 480 volt to 220 on a es/20sc double convection oven


You need a transformer to do that. I assume that you are in the USA and you have a 480V three phase service. With 480V three phase there is 277 volts between any two of the phases. There are transformers to drop 277V down to 220V.
A better solution is to ask your power company for 220V service. The power company owns the transformer and you only have to provide the in house wiring. .If you have a commercial establishment you have to meet all local codes and be inspected. If you don't the liability is very great.
Use a licensed electrician.

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How to wire a cooper Quadra Mark MH 277 Volt light


Quadra mark is commercial metal halide light
It appears the 208-240 480V model is different from 120, 277 or 347V model.
You cannot connect 277Volt light to 240Volt
These are two different things.
Commercial 277V has 1 hot leg and a neutral (very similar to residential 120V which also has 1 hot leg and neutral)
http://waterheatertimer.org/images/How-to-wire-outlets-14.jpg
While residential 240V has 2 hot legs
http://waterheatertimer.org/See-inside-main-breaker-box.html

Check rating label on light and see if it shows 120V in addition to 277V
If rating plate shows 120V, then it should work.

Residential 240Volt has 2 hot legs, each Hot leg measures 120V to ground
So you can use one Hot leg from the 240Volt breaker, and use ground wire to make 120Volt circuit.
Using ground wire to complete circuit in this manner is completely out of code and not recommended by any professional electrician. But it will work.

http://waterheatertimer.org/How-to-wire-3-phase-electric.html
http://www.electriciantalk.com/f5/

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Installed but not heating


State point-of-use electric water heater plugs in.
Check that outlet has power.

The water heater must be full of water or elements burn out instantly.
Test the element.
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-install-point-of-use-water-heater.html

Match voltage to water heater:
This electric water heater, like all electric water heaters, will work on 120Volt, 208-240Volt or 3-phase unbalanced.
But wire size and breaker must match element wattage.
If you have outlet, check the wire size and breaker, and check what other devices are drawing power from same circuit, then add up total watts and compare with charts on link below.
http://waterheatertimer.org/Color-codewire.html#water-heater

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1 Answer

Fan runs 2-3 sec. shuts off then comes back on and then does it again. This is on a 480v 1 phase unit about 4 yrs. old.


Sounds like a faulty fan switch. Typically, they come on when they get hot and turn back off when cooled off. Sounds like yours is just too sensitive.

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1 Answer

Need instructions on how to install a 750W Fahrenheat heater. Wire size, breaker size, etc.


Hi,
To know what to tell you you need to know if it is 1 phase or 3 phase and what the voltage is that it will be running on...

Assuming that it is 240v 1 phase current you will need at least a 40 amp 2 pole breaker and #8 wire for a distance of upto about 100 ft. if longer then you need to go up to #6 wire....

7500 watts / 240v equals 31.25 amps... so a thirty to too small and you will need the 40....

Wire sizing needs to go larger as the run gets longer...

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I HAVE A 3 PHASE 480V. 50 AMP TED134050 BREAKER WHICH FEEDS A 45 K.W. TRANSFORMER.WHICH TRIPS OCCASIONALLY, NOT OFTEN. IT RESETS O.K. WHAT DO YOU SUGGEST?


Hi,

I would get an amp metetr on it and see what the load is.... if it is running continually at over 40 amp. then you are overloading it...and need to shed some load...

If it is not then the breaker is going bad and needs to be replaced...

heatman101

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1 Answer

I have a new water heater, and the hook up terminals are labled 1-2-3 are they hooked the same as in the panel 1-2-3 ?


No. You have to find out if you have 3 phase or single phase power. If this is a new unit you will find a wiring diagram inside the front cover. 3 phase power has 3 "hot" wires. Single phase has 2 "hot" wires. There is a big difference when you hook it up wrong. I don't know if this is a new installation or if you are replacing an old one. The terminals are numbered for 3 phase. If you look in your breaker box, 3 phase 208 will haven a breaker with 3 spaces hooked together by one bar. Single phase will have two spaces hooked together by a bar. So if the breaker kicks out it will flip all 3 space on 3 phase or 2 spaces on single phase. If you already have wires to the location of the booster heater, you may have to use single phase if that is all that is at that location. If you have single phase power you will have to look at the wiring diagram and you will see the terminal block represented for both single and 3 phase. Normally running from the terminal block will be six wires marked 1 through 6. The wireing diagram will say something like "for single phase put 1,3,5 on terminal 1 and 2,4,6 on terminal 3. Leave terminal 2 out all together. Of course at this point your 2 hot wires will go to terminal 1 and 3. There are other considerations as well. With 3 phase the circuit wires will be smaller gauge and may not carry the current you need for single phase. This is a booster heater. You need to hook up your hot water line to go into the heater and the boosted hot water to your appliance. It will not work to heat your water for other purposes. It is meant to take 140 degree water and boost it to 190 degrees. Good luck, hope this helps

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1 Answer

I have 3phase in my shop. I have a new machine that is rated for 208v 3ph. how can I tell what my incoming voltage is?


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