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PowerEight 05-20-2008 01:25 AM

Choosing Proper Wire size
 
What is the proper wire size for about 1600 watts, 20 amps? For about 35 feet...

Thank you! :no:

HouseHelper 05-20-2008 06:51 AM

Quote:

Originally Posted by PowerEight (Post 124405)
What is the proper wire size for about 1600 watts, 20 amps? For about 35 feet...

Thank you! :no:

At least 12ga.

Is this a trick question?

CowboyAndy 05-20-2008 09:33 AM

Quote:

Originally Posted by PowerEight (Post 124405)
What is the proper wire size for about 1600 watts, 20 amps? For about 35 feet...

Thank you! :no:

As HouseHelper said, 12AWG is perfectly fine for what you need. At 35 feet, voltage drop is NOT going to be an issue.

Just curious, what are you wiring up?

PowerEight 05-20-2008 10:51 AM

Thank you, not a trick question...
 
Quote:

Originally Posted by HouseHelper (Post 124424)
At least 12ga.

Is this a trick question?

Not really, I am a lay person... not LAME but... not an electrician anyhow. But I was reading online and someone wrote 12gauge wire only supports 360 watts. Anyway, I bought 14/2 so I guess I should return it. We're installing a outlet for a room we're gonna slowly work on to make a gym and sauna and hot tub and steam room... I can't wait... so all that power will surge the house and melt that 14 wire I think... my father in law says the lower #'s are the tougher ones...

CowboyAndy 05-20-2008 10:59 AM

Quote:

Originally Posted by PowerEight (Post 124493)
Not really, I am a lay person... not LAME but... not an electrician anyhow. But I was reading online and someone wrote 12gauge wire only supports 360 watts. Anyway, I bought 14/2 so I guess I should return it. We're installing a outlet for a room we're gonna slowly work on to make a gym and sauna and hot tub and steam room... I can't wait... so all that power will surge the house and melt that 14 wire I think... my father in law says the lower #'s are the tougher ones...

Well, 14AWG can handle 1800 watts, so thats a bit close to the draw you plan on, so 12 would be a wise choice. What do you plan to plug into this outlet? Also, make sure in a situation like this that it is GFI protected.


And whoever informed you that 12awg wire supports 360 watts is flat out wrong.


whe you need to determine what wire size, you start with how many watts you are going to draw. once you have that, you use a wire that can handle a larger draw than what you expect... as in 1600 watts x 120v = 13.3, so 15amps /14awg wire is what it would be up to. but theres not any wiggle room there, so i would go up one more to 20amp, which requires a minimum of 12awg wire.

the formula for wattage is amps x volts... in this case it would be 15A x 120v = 1800 watts, 20a x 120v = 2400 watts.


at 360 watts, that would be an amp draw of 3 amps. whoever told you that should not give advice anymore!

HouseHelper 05-20-2008 11:00 AM

The 12ga/20A circuit will support 2400W (20Ax120V), but you cannot support the sauna, hot tub, and steam room on the circuit unless all your heating comes from another source.

BigJimmy 05-20-2008 01:16 PM

Quote:

Originally Posted by CowboyAndy (Post 124497)
... as in 1600 watts x 120v = 13.3, so 15amps /14awg wire is what it would be up to.

:huh: P=IV, I=P/V

analogmusicman 05-20-2008 04:17 PM

just an observation: my whirlpool bath is on a 30A circuit.

tnx,

HouseHelper 05-20-2008 04:58 PM

Quote:

Originally Posted by analogmusicman (Post 124556)
just an observation: my whirlpool bath is on a 30A circuit.

tnx,

But is it supposed to be?

frenchelectrican 05-20-2008 11:19 PM

Quote:

Originally Posted by CowboyAndy (Post 124497)

And whoever informed you that 12awg wire supports 360 watts is flat out wrong.




Well if the 12 gauge wire is used for very long run like 250 feet run then it make sense due the voltage drop on long runs.

That why somecase you have to make a judgement call on very long runs.

I done alot of very long runs and depending on how much load it will be on the wires most percentage i useally bump up a size or more depending on distance.

Merci,Marc

CowboyAndy 05-21-2008 06:40 AM

Quote:

Originally Posted by frenchelectrican (Post 124663)
Well if the 12 gauge wire is used for very long run like 250 feet run then it make sense due the voltage drop on long runs.

That why somecase you have to make a judgement call on very long runs.

I done alot of very long runs and depending on how much load it will be on the wires most percentage i useally bump up a size or more depending on distance.

Merci,Marc

Yes, i agree that voltage drop can and will at some point limit 12awg to alot less. But that wasn't my point. The OP was told by someone that "12awg wire will only support up to 360 watts". That statment is flat out wrong. While it is possible, it is not probable in the OP's situation, as he is only running about 35 ft. That's like saying "if you cross the street, you WILL get hit by a bus" Possible, but not probable.

Holden McGroin 05-21-2008 06:24 PM

Use the following guide:
15 amps = 14ga.
20 amps = 12 ga.
30 amps = 10ga.
40 amps = 8 ga.
50 amps. = 4-6 ga.

analogmusicman 05-21-2008 06:53 PM

Quote:

Originally Posted by Holden McGroin (Post 124862)
Use the following guide:
15 amps = 14ga.
20 amps = 12 ga.
30 amps = 10ga.
40 amps = 8 ga.
50 amps. = 4-6 ga.


uh Holden...that your real name?

tnx,

Holden McGroin 05-21-2008 07:05 PM

Is Analog yours? Duh? :wink:

analogmusicman 05-21-2008 08:53 PM

Quote:

Originally Posted by Holden McGroin (Post 124872)
Is Analog yours? Duh? :wink:


touche!!!:yes:


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