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04-29-2007, 08:35 PM
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#1
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Senior Member
Join Date: Jan 2007
Posts: 133
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Voltage drop
I performed a voltage drop calculation on a 120V 15A circuit. The circuit needs ran a total of 200 feet. For me to get under the 3% drop I keep coming up with #6AWG. Does this seem correct? Guess I won't be back stabbing  .
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04-29-2007, 08:37 PM
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#2
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Moderator
Join Date: Jan 2007
Location: NY State
Posts: 7,511
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What is the actual load? Obviously not 15 amps. Or is it?
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04-29-2007, 08:45 PM
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#3
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Senior Member
Join Date: Jan 2007
Posts: 133
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It will only be about 6.7 amps I am told. It is for a radio station tower.
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04-29-2007, 08:50 PM
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#4
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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In case your load really is 15 amp, your calc is correct. You could use 8 gauge, and only have 3.3% drop. This is the reason why you always see mega-sized conductors roped between seemingly low-load parking lot lights.
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04-29-2007, 08:57 PM
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#5
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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Quote:
Originally Posted by K&R
It will only be about 6.7 amps I am told. It is for a radio station tower.
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In that case, #10 will work great.
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04-29-2007, 09:14 PM
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#6
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Modérateur
Join Date: Mar 2007
Location: NE Wi / Paris France{ In France for while }
Posts: 4,220
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Marc {MD},, just wondering where did ya get that fancy gimzo to do that caluation on line ??
all i have a simple electrician calucauter with me it did say the same thing what you say there.
Merci, Marc
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04-29-2007, 09:19 PM
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#7
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Moderator
Join Date: Jan 2007
Location: NY State
Posts: 7,511
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I like that too. My calculator is dinky DOS based.
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04-29-2007, 09:27 PM
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#8
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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I got it from Homer Simpson, in case any of you old time internet crawers know that guy.
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04-29-2007, 10:06 PM
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#10
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Senior Member
Join Date: Jan 2007
Posts: 133
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Thanks for all the help. I think I will go with the #10. I just hope these guys are correct and it is 800W equipment.
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04-29-2007, 11:22 PM
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#11
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Moderator
Join Date: Jan 2007
Location: NY State
Posts: 7,511
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Quote:
Originally Posted by MDShunk
I got it from Homer Simpson,....
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I remember Homer. What ever happened to him?
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04-30-2007, 05:47 PM
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#12
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Wire Ninja
Join Date: Jan 2007
Location: Beautiful Cumberland Valley, in PA
Posts: 16,794
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Quote:
Originally Posted by Speedy Petey
I remember Homer. What ever happened to him?
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He's still around, but just not where he used to be. Roger has his contact info..
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04-30-2007, 10:33 PM
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#13
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Senior Member
Join Date: Mar 2007
Posts: 190
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i use the one from visions, i got it free when i bought my estimating software from them
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