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Finish Carpenter
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Discussion Starter · #1 · (Edited)
I am a finish carpenter and spend most of my time over in that forum, but I just put an addition on an out building of mine and I am running some UF to it so I have lights and what not, but it would also be nice to run power tools off it. I know 14 awg is rated for 15 amps, but my question is how long of run is it rated for that? Will I be able to run things like a miter saw or job site table saw off it or is that too much? It is going to be about a 150 foot run to the panel. Maybe I should be posting this over at the DIYchatroom.....
 

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I own stock in FotoMat!
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Voltage drop is dependent on the load, so the larger the load (in amps), the shorter the wire can be and still maintain a usable voltage.

If you're installing wire that length to run power tools, do yourself (and your tools) a huge huge huge favor and get something really big, like 6 or 4.
 

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6 or 4 is what I would run if I was installing a subpanel, but with what he describes I think it would be fine to just install 10. 10 will more than cover lighting and occasional power tool usage. Only reason I would go bigger is if the was gonna be using multiple tools at once, like a dc of some sort and a tool.

If you do plan on running tools out there frequently then install a subpanel and run 240 out there so you can have the tools on seperate circuits if needed (lighting too, stinks when you pop a breaker and lights go out). It is all pretty easy to do and figure out the requirements if you know where to look.
 

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ghost,
have you been on a job and used a 100' 16 guage extension cord and fired up the wormdrive and have it drag and then hit full speed? get a sup panel and run some #6 3 wire + ground aluminum direct burial cable. you will have plenty of power and 22o at the outbuilding.
 

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Fentoozler
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5,623 Posts
... I just put an addition on an out building of mine and I am running some UF to it so I have lights and what not, but it would also be nice to run power tools off it. I know 14 awg is rated for 15 amps, but my question is how long of run is it rated for that? Will I be able to run things like a miter saw or job site table saw off it or is that too much? It is going to be about a 150 foot run to the panel.
IMHO, as long as you are digging a ditch ~ run some 1" - 1 1/2" conduit [PVC]....
- 1 for power
- 1 for tele/cable/data
- 1 as a spare



You may decide you need some heat/AC...a refrig., phone, TV, Internet, etc.

Why limit yourself?

You can leave 2 as spares and just use the 1 for your minimal power needs... as time goes by, you may decide you need/want the above mentioned.

I would go with a sub-panel in any case.....going back to the main house because a breaker tripped can be tiring and annoying during inclement weather.


Maybe I should be posting this over at the DIYchatroom.....
Why?

Contractors can help contractors out "out of trade" w/o having to go all "DIY", no?
 

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Finish Carpenter
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Discussion Starter · #7 ·
This "out building" is more like a larger shed. It is used to hold some tools, supplies and the lawn/garden equipment for around my home. It is by no means now, or ever will be a shop type building. Its only a 10 x 18 foot building....so you see, I am not looking for a ton of power, all I wanted was a set of lights and figured I could put an outlet to run a power tool off it of b/c, quite frankly, sometimes it is easier to park by it and work then to move the families cars to get access to the garage.... but if we are talking I should be running a heavy duty line, then it is not a real big deal...I was just wondering what I can pull on a 14 awg line....
 

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I own stock in FotoMat!
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If you were to load AWG 14 up to it's rated 15 amps, you would only have 106 volts at that distance. That's an 11.4% drop from 120volts.

In order to maintain the NEC suggested 3% drop, you would need AWG 8.

If you are only using 8 or 9 amps max, you could get by with AWG 10.



(In your OP, you wanted to know how far AWG 14 will carry 15 amps and still have <=3% drop? Ans. : 40 feet.)
 
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Fentoozler
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This "out building" is more like a larger shed. It is used to hold some tools, supplies and the lawn/garden equipment for around my home. It is by no means now, or ever will be a shop type building. Its only a 10 x 18 foot building....so you see, I am not looking for a ton of power, all I wanted was a set of lights and figured I could put an outlet to run a power tool off it of b/c, quite frankly, sometimes it is easier to park by it and work then to move the families cars to get access to the garage.... but if we are talking I should be running a heavy duty line, then it is not a real big deal...I was just wondering what I can pull on a 14 awg line....

Listen to me...you're thinking too small here right now...one day, that shed [albiet a newer, bigger one] is going to be your man cave.


...but if you wanna cheap out on us [and yourself ] go with the single circuit setup.
A #10 min. as 480 detailed.
 

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Baltimore Electrician
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Even if you want to go with the single circuit, at least install conduits in the trench now. Not really a lot of money, but it sure beats re-opening that trench if you change your mind a couple of years down the road.
 

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ampman
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783 Posts
I am a finish carpenter and spend most of my time over in that forum, but I just put an addition on an out building of mine and I am running some UF to it so I have lights and what not, but it would also be nice to run power tools off it. I know 14 awg is rated for 15 amps, but my question is how long of run is it rated for that? Will I be able to run things like a miter saw or job site table saw off it or is that too much? It is going to be about a 150 foot run to the panel. Maybe I should be posting this over at the DIYchatroom.....
add way more than you will need now you will never regret it
 
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