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 DIY Chatroom Home Improvement Forum Do I have an electrical issue?

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12-23-2009, 11:26 AM   #1

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## Do I have an electrical issue?

My readings are 124V to ground, and 213V between. This seems high to me for a 208V system.

Is this normal or do I have a problem?

12-23-2009, 11:35 AM   #2
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Quote:
 Originally Posted by HVACgirl My readings are 124V to ground, and 213V between. This seems high to me for a 208V system. Is this normal or do I have a problem?
It shouldn't be a problem.

12-23-2009, 02:46 PM   #3
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Quote:
 Originally Posted by HVACgirl My readings are 124V to ground, and 213V between. This seems high to me for a 208V system. Is this normal or do I have a problem?
208/(sq. rt. of 3) = 120v

100(213/208)=102% = 2% high.
For resi. power in MD, PoCo is allowed +/- 5%, and in some places they're allowed +/- 10%.

A 120v incand. bulb on 124v will last 60% of rated lifetime.

BTW, 124v x (sq. rt. of 3) = 215v vs. 213v that you measured. This is probably within a reasonable experimental error.

Last edited by Yoyizit; 12-23-2009 at 03:16 PM.

 12-23-2009, 04:17 PM #4 You talking to me?     Join Date: Dec 2007 Location: sw mi Posts: 7,551 Rewards Points: 6,290 where are you that you have 208 for line to line? and no, the numbers you have are well within legally mandated standards if you do have a 120/208 service. Now, if you had a 120/240 system like most of the homes in the US have, you would definitely be below any acceptable voltage readings on the line to line check.
 12-23-2009, 05:18 PM #5 Member   Join Date: Nov 2007 Location: Nashua, NH, USA Posts: 8,597 Rewards Points: 2,800 I would guess it is a commercial or mixed use building fed by a 3 phase 120/208 volt line where some tenants have just two phase lines coming into their premises. Although most distribution systems are 3 phase, residential neighborhoods have single phase 120/240 service from a utility transformer connected to one distribution phase and ground or to two distribution phases (line to line), where between the latter the current is actually single phase. __________________ Stick to your lawn watering schedule until it really starts to pour. After the storm you have only the same number of rest days you always had and then you need to start watering again. Last edited by AllanJ; 12-23-2009 at 05:20 PM.
 12-23-2009, 05:44 PM #6 You talking to me?     Join Date: Dec 2007 Location: sw mi Posts: 7,551 Rewards Points: 6,290 Being a professional commercial/industrial electrician myself, I am aware of the possibilities. I was merely trying to determine if HVACgirl is a pro that is lost or truly a DIY'er.
12-24-2009, 03:13 AM   #7
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Quote:
 Originally Posted by HVACgirl My readings are 124V to ground, and 213V between. This seems high to me for a 208V system. Is this normal or do I have a problem?

Naw., you are ok with that voltage there.

It will varies a little depending on the system layout is.

It can run low as 200 volts and high as 218 volts { that is line to line voltage on 208 V system }

Merci,Marc

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