Voltage drop

3067 Views 12 Replies 5 Participants Last post by HCECalaska, May 1, 2007

K&R

Discussion Starter · Apr 30, 2007

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 :laughing:.

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Speedy Petey

· #2 · Apr 30, 2007

What is the actual load? Obviously not 15 amps. Or is it?

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K&R

Discussion Starter · #3 · Apr 30, 2007

It will only be about 6.7 amps I am told. It is for a radio station tower.

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MDShunk

· #4 · Apr 30, 2007

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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MDShunk

· #5 · Apr 30, 2007

K&R said:
It will only be about 6.7 amps I am told. It is for a radio station tower.

In that case, #10 will work great.

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frenchelectrican

· #6 · Apr 30, 2007

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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Speedy Petey

· #7 · Apr 30, 2007

I like that too. My calculator is dinky DOS based.

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MDShunk

· #8 · Apr 30, 2007

I got it from Homer Simpson, in case any of you old time internet crawers know that guy.

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K&R

Discussion Starter · #9 · Apr 30, 2007

You can get a version of a calc here but they charge.
http://www.visioninfosoft.com/products/electrical/ecm/index.php

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K&R

Discussion Starter · #10 · Apr 30, 2007

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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Speedy Petey

· #11 · Apr 30, 2007

MDShunk said:
I got it from Homer Simpson,....

I remember Homer. What ever happened to him?

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MDShunk

· #12 · Apr 30, 2007

Speedy Petey said:
I remember Homer. What ever happened to him?

He's still around, but just not where he used to be. Roger has his contact info..

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HCECalaska

· #13 · May 1, 2007

i use the one from visions, i got it free when i bought my estimating software from them

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