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Old 04-14-2011, 11:01 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).

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Old 04-14-2011, 11:24 AM   #2
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8.8 volt drop


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Originally Posted by Joe Willie View Post
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.

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Old 04-14-2011, 11:48 AM   #3
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8.8 volt drop


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.
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Old 04-14-2011, 11:51 AM   #4
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8.8 volt drop


Sounds like a homework question.
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Old 04-14-2011, 01:33 PM   #5
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8.8 volt drop


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.
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Old 04-14-2011, 01:50 PM   #6
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8.8 volt drop


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 02:00 PM.
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Old 04-14-2011, 02:10 PM   #7
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8.8 volt drop


The fridge and light won't be drawing 20 amps so the drop will be less than your calculator.
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Old 04-14-2011, 02:18 PM   #8
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8.8 volt drop


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.
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Old 04-14-2011, 03:21 PM   #9
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8.8 volt drop


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.

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