8.8 Volt Drop - Electrical - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum 8.8 volt drop

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04-14-2011, 10:01 AM   #1
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## 8.8 volt drop

What effect would an 8.8v drop have on a (a) fridgerator (b) 3x100 watt bulbs? Given: (120v of 20A run 220' on 10 gauge cable).

04-14-2011, 10:24 AM   #2
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Quote:
 Originally Posted by Joe Willie What effect would an 8.8v drop have on a (a) fridgerator (b) 3x100 watt bulbs? Given: (120v of 20A run 220' on 10 gauge cable).
Where are you getting this 8.8V number from? The refrigerator should run fine, and the lights will be slightly dimmer, but not noticably.

 04-14-2011, 10:48 AM #3 Member   Join Date: Nov 2007 Location: Nashua, NH, USA Posts: 8,699 Rewards Points: 3,004 Depending on what the voltage started out (at the main panel) you could shorten the life of the refrigerator, for example if the voltage went down to around 100-104 volts as the fridge kicks on. The low voltage won't hurt the light bulbs, in fact incandescent bulbs last longer when given less voltage than they are rated for. The efficiency (amount of light per watt) will be less though. __________________ Stop some of your bank autopayments so you can set priorities for manual monthly payments out of your coronavirus stimulus check.

 04-14-2011, 10:51 AM #4 Master Electrician     Join Date: Aug 2008 Location: Near Jackson Michigan Area Posts: 1,453 Rewards Points: 506 Sounds like a homework question. __________________ Kyle Just because you can, doesn't always mean you should
 04-14-2011, 12:33 PM #5 Member   Join Date: Dec 2010 Location: Pass Christian, MS Posts: 66 Rewards Points: 75 I got the 8.8% vd from a vd calculator given 10 gauge, 20 A, 220' normal conditions. I know the wisdom is to shoot for less than 5vd in any system. I just wanted to know from someone else's experience, what it would look like. a roll of 6-UF is \$800, 10-3UF is \$340 at HD.
 04-14-2011, 12:50 PM #6 Member     Join Date: Apr 2011 Location: Nashville Posts: 70 Rewards Points: 75 JW my computer program 4% for 10 amps and 8% for 20 amps. a regular frig uses about 6 amps I think. corrected prior post. Last edited by wareagle; 04-14-2011 at 01:00 PM.
 04-14-2011, 01:10 PM #7 Super Moderator     Join Date: Mar 2005 Location: Welland, Ontario Posts: 19,780 Rewards Points: 30,876 Blog Entries: 11 The fridge and light won't be drawing 20 amps so the drop will be less than your calculator.
 04-14-2011, 01:18 PM #8 Member   Join Date: Dec 2010 Location: Pass Christian, MS Posts: 66 Rewards Points: 75 Joed, Thank you so much. That was the best information. I was figuring this using the breaker size, not the actual amps employed. I should be good at less than 5vd if I keep the two circuits loaded under 10A draw. Cool.
 04-14-2011, 02:21 PM #9 Scared Electrician     Join Date: Nov 2009 Location: Colorado Posts: 715 Rewards Points: 500 I'm not sure if this was an error or not, but note that it is not 5v of drop that we shoot for but 5% voltage drop. So @ 240v thats about 12v. Less is better of course. __________________ Ragged Trousered Philanthropist Please follow the code - its there for your safety no matter how inconvenient.

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