Three Phase Element, it should work but it doesn't - Electrician Talk - Professional Electrical Contractors Forum
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Old 01-05-2018, 08:19 PM   #1
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Default Three Phase Element, it should work but it doesn't

I am working on an electric steam kettle. The element is a 6 wire element (three loops) that is 24kW three-phase 220v. There are two contactors and a low water switch, t-stat, and tilt switch. The kettle was converted from 480v by switching out the element, removing a transformer, and adding one of the contactors. During that install, some wires were switched, shorting out the new contactor. A second new contactor was installed. The steam kettle worked for dozens/hundreds of cycles. Just recently the "new" contactor fried. After examining the circuitry I think the cause was the wiring. The wiring running to the contactor was never replaced after the first short.

I have replaced all suspect wires and put in a new contactor, but the element will not heat. Each of the three element loops has continuity and is reading the same (and to spec) resistance. There is no short to the kettle body. I am getting a reading of 212v across the element. There is the correct phasing going to the element terminals.

It appears that the element is functioning and I am getting a correct voltage reading across the element - but no heat. Ohm's law doesn't lie, so something is not right. Any thoughts on what I am over looking?
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Old 01-05-2018, 08:34 PM   #2
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You should get a electrician to come out and help you on this one.

it much safer to have a electrician to take a look of it.

accourding to your profile it say .,

food production equipment

therefore the best answer is get electrician and deal with it due they will know excatally what to look for.
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Old 01-05-2018, 08:36 PM   #3
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Just because there is voltage, and continuity, does not mean the element will work. It’s probably fried
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Old 01-05-2018, 08:52 PM   #4
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If you are not an electrician, please visit our sister site.
http://www.DIYChatroom.com/register.php/
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Old 01-05-2018, 09:43 PM   #5
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If you are not an electrician, please visit our sister site.
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You forgot to "lock the door"!
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Old 01-05-2018, 09:47 PM   #6
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There is no such thing as a 3 phase element.
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Old 01-05-2018, 10:41 PM   #7
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There is no such thing as a 3 phase element.
That's what I was thinking. But at least the "phasing" is correct.(?) Along with the "tilt switch", the low water switch, the T-stat, and the second contactor, I'd suggest checking if it's plugged in.
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Old 01-05-2018, 10:55 PM   #8
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That's what I was thinking. But at least the "phasing" is correct.(?) Along with the "tilt switch", the low water switch, the T-stat, and the second contactor, I'd suggest checking if it's plugged in.
Phase rotation on a heater is very important.. Otherwise it takes heat from the air and doesn't give off heat..
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Old 01-05-2018, 10:57 PM   #9
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If the 3 elements are 480 volt each, they will be connected ∆. If so, there should be 480 across each element. If there is only 212 volts, the problem is upstream from the elements.

I would measure voltage at the incoming line (under load of course), if it's good then I'd do a fall of potential test from the element to the incoming line.

Have you measured current at the elements?

It's also possible you have an open fuse somewhere.
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Old 01-05-2018, 11:10 PM   #10
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is the phase rotation correct ?

Is it a star or delta set up ?
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Old 01-06-2018, 12:17 AM   #11
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is the phase rotation correct ?

Is it a star or delta set up ?
It all depends on what you call correct. Our rotation in the U.S. goes completely opposite from the "land down under"!
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Old 01-06-2018, 02:56 AM   #12
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Does that mean we go the right way ?
And you guys go the wrong way ?

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Old 01-06-2018, 06:16 AM   #13
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Quote:
Originally Posted by barnacleak View Post
I am working on an electric steam kettle. The element is a 6 wire element (three loops) that is 24kW three-phase 220v. There are two contactors and a low water switch, t-stat, and tilt switch. The kettle was converted from 480v by switching out the element, removing a transformer, and adding one of the contactors. During that install, some wires were switched, shorting out the new contactor. A second new contactor was installed. The steam kettle worked for dozens/hundreds of cycles. Just recently the "new" contactor fried. After examining the circuitry I think the cause was the wiring. The wiring running to the contactor was never replaced after the first short.

I have replaced all suspect wires and put in a new contactor, but the element will not heat. Each of the three element loops has continuity and is reading the same (and to spec) resistance. There is no short to the kettle body. I am getting a reading of 212v across the element. There is the correct phasing going to the element terminals.

It appears that the element is functioning and I am getting a correct voltage reading across the element - but no heat. Ohm's law doesn't lie, so something is not right. Any thoughts on what I am over looking?
Is the OCP fuses by any chance?
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Old 01-06-2018, 11:56 AM   #14
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Thanks for the responses. I will be getting an electrician.
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Old 01-06-2018, 09:06 PM   #15
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Please come back and let us know what it was ?
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