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Electrical help

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08-20-2004 12:08:27

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Hooked up a under the sink instant hot water heater. It called for 8g wire 220 volt and the run was about 50". Ran the black to black and red to red and used the white for a ground as the unit called for a ground. Now my other lights are flickering when it is drawing power. Any clue why?

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MarkB

08-21-2004 03:26:55

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

You have a marginal connection in the breaker panel or somewhere upstream of it. The problem is not in your water heater installation, it has been there all along but you were never drawing enough power to notice it. It could be corrosion or a loose connection at the main breaker, for example.

Get an ac voltmeter. Monitor the voltage from each leg to neutral as you cycle the water heater. You can start at the buss bars in the breaker panel. You'll probably see one leg stay at about 115V and the other leg dropping to 100V or less. Once you've confirmed the voltage drop, it's a matter of tracing back until you find the bad connection. (That is, a connection where the voltage is good on one side and bad on the other.) If you get all the way to your meter and you still see a voltage drop, then it's your power company's problem.

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Bob

08-20-2004 21:47:37

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

1.) Your service entrance is probably marginal, including the drop to the ultility's transformer.

2.) That heater draws a LOT of current when it kicks in, SO...

#.) Your lights flicker. (Which probably has nothing to do with your grounding methods, etc., etc.).

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Mike Johnson

08-20-2004 18:04:36

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

Check the connections upstream from this beast, do you have aluminum wire in the picture? had some last week on a service call that I pulled them right out of the lugs when I got there, don"t worry about a GFI you have no need for one here,and if it"s a normal breaker it"s either on or it"s off, not like a current limiting fuse like you see in industrial places, if you are feeding this off of a 50 amp breaker the fine print of the national electrical code table 310.16 calls for a number 6 wire for that, you can not exceed the 60 degree section with romex cable for other than derating purposes. If you have flickering lights check for loose connections, but be careful you never know what you might find when you looked for them. Also double check what your "white" wire was for from the company that made it, you might be hooked to the center of the heating element, and might not have a ground, every one of these that I have delt with were all different.

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08-20-2004 18:41:27

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Re: Electrical help in reply to Mike Johnson, 08-20-2004 18:04:36

Thanks.. no aluminum wire, all copper. The unit itself has a green for ground and calls for it to be grounded. The 8 g that I used had the red, black and white. The white I used to ground the unit to the ground at the panel. I did check code and no gfi is called for.

I do think that the 8 g is minimum and it probably should have 6g...but..that shouldn"t cause flicker of the lights only a heating up of the wires which is not happening. This thing is drawing 9kw and is rated for 0-50 amps.

All the nuts are tight and the flickering is terrible and this in the barn so I can live with it as long as I haven"t created some sort of hazzard. I don"t think so.

It"s not as if I"m running showers or running the hot water for an hour. Just to wash hands.

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08-20-2004 15:19:39

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

Thanks.. mistake,, not 50" but 50". No GFI...will look into that. Main box is 200amps from there to the barn a 100 amp breaker in the main box at house and at barn 100 amp service. The unit is on its own dedicated circuit breaker of 50 amps. I can"t answer the other questions as yet.

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08-20-2004 15:21:25

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Re: Electrical help in reply to Bo, 08-20-2004 15:19:39

One more..both ends of the white are taped green to indicate ground and it is grounded in the circuit box at the ground lugs not the neutral lugs.

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paul

08-20-2004 15:24:31

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Re: Electrical help - fifty feet in reply to bo, 08-20-2004 15:21:25

I"m no help, but you are saying it is a 50 foot run of wire. This site has started goofing on those foot & inch marks - both come out as inch marks. :)

--->Paul

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08-20-2004 16:06:35

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Re: Electrical help - fifty feet in reply to paul, 08-20-2004 15:24:31

Thougth I type that right. Yes a fifty foot run.

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TheRealRon

08-20-2004 12:41:36

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

You're only telling us 10% of the story. In addition to everything buickanddeere asked...

50" from what? Your panel? a branch? An outlet?

Is it direct wired or did you run a receptacle/plug?

Is the circuit shared?

A very general answer here until you fill in the blanks...

If lights on the same circuit flicker, you have it wired wrong or you have exceeded the circuit's capacity and must run a new dedicated circuit.

If lights on other circuits flicker, pull the main breaker and call the electric company pronto.

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buickanddeere

08-20-2004 12:30:17

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Re: Electrical help in reply to bo, 08-20-2004 12:08:27

Did you tape the white wire green on each end to ID it as a ground? Which lug in the service panel did you connect the "ground" wire to? What is the voltage line to line,lines to neutral and lines to true earth ground when the heater is on standby and in operation? If the lights are flourescent it maybe low voltage causing the flicker. How far is the hydro service transformer from your home panel. Is it a 60,100 or 200amp service?

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buickanddeere...GFI

08-20-2004 12:34:51

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Re: Electrical help in reply to buickanddeere, 08-20-2004 12:30:17

By the way. Is that new breaker a GFI?

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