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03-07-2012, 11:28 AM   #1
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## wire gauge help

What gauge wire do you need for 150 Amps and 200 Amps?

I am just making a chart thanks.

03-07-2012, 12:31 PM   #2
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Quote:
 Originally Posted by biferi What gauge wire do you need for 150 Amps and 200 Amps? I am just making a chart thanks.
There is a sacred book Sparkies use. I think they charted and worked out the new round wheel you have in mind.

I hire but do not speak for them. I have heard them speak of amperage and voltage in the same sentence but cannot phathom how to answer your question.

Physics people scare me more. They all wear rubber shoes.

Just to help you. Rock out Dude. 200 amps worth of electricity could run a rock concert. If three phase voltage were on stage.

Last edited by user1007; 03-07-2012 at 12:45 PM.

 03-07-2012, 12:59 PM #3 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 According to this link http://home.earthlink.net/~jimlux/hv/fuses.htm Practical example> 16 gauge copper wire: Tmelt = 1083, Area = 2581 circ mil, Time = 5 sec,diam = .0524 inches Using Preece equation: = 10244*.0524^1.5 = 123 Amps Using Onderdonk equation: Ifuse = 2581 * SQRT( LOG((1083-25)/(234-25)+1)/(5*33)) 177.7560411 176.9444452 = 178 Amps #16 AWG will last 5 seconds carrying 178A in free air over some range of currents and times, so you probably want to go heavier than this. This link http://www.google.com/search?client=...UTF-8&oe=UTF-8 will help you narrow down your options some.

 03-07-2012, 01:03 PM #4 Member     Join Date: Mar 2005 Location: Welland, Ontario Posts: 12,409 Rewards Points: 11,610 Blog Entries: 11 Post your location. It differs between Canada and the US per codes. Can also differ depending on the use. Service entrance can different than sub panel feed.
 The Following 2 Users Say Thank You to joed For This Useful Post: frenchelectrican (03-07-2012), Speedy Petey (03-07-2012)
 03-07-2012, 01:15 PM #5 Member   Join Date: Dec 2008 Location: Fairbanks, AK Posts: 1,893 Rewards Points: 1,092 I believe this is accurate. #4 copper ( or #2 Alum.) for 100 amp; 2/0 copper (or 4/0 Alum.) for 200 amp. Make sure aluminum is legal in your area. Last edited by jklingel; 03-07-2012 at 01:20 PM.
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03-07-2012, 02:26 PM   #6

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Quote:
 Originally Posted by jklingel I believe this is accurate. #4 copper ( or #2 Alum.) for 100 amp; 2/0 copper (or 4/0 Alum.) for 200 amp. Make sure aluminum is legal in your area.
As Joe said, this is for residential services ONLY.
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 03-07-2012, 02:27 PM #7 An old Tradesmen   Join Date: Oct 2008 Location: Somewhere Posts: 33,589 Rewards Points: 6,142 Moved to the Electrical forum. There is no one wire size for X amps. As the length and how it is to be installed will play a big roll in sizing.
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 03-07-2012, 02:41 PM #8 Member   Join Date: Dec 2008 Location: Fairbanks, AK Posts: 1,893 Rewards Points: 1,092 Length being important is a good point: I should have included XX size for YY feet.
 03-07-2012, 02:52 PM #9 Member     Join Date: Apr 2011 Location: Almost Arkansas Posts: 2,764 Rewards Points: 2,000 This can help..look here. Wire ampacity chart __________________ Do you want it your way or the right way?
03-07-2012, 02:58 PM   #10
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Quote:
 Originally Posted by beenthere Moved to the Electrical forum. There is no one wire size for X amps. As the length and how it is to be installed will play a big roll in sizing.
Yes there is, 4/0 al is able to hold 200a. Now if you decide to do a 1000' run you'll have to upsize, however it's still able to carry 200a.
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03-07-2012, 03:24 PM   #11

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Quote:
 Originally Posted by Julius793 Yes there is, 4/0 al is able to hold 200a. Now if you decide to do a 1000' run you'll have to upsize, however it's still able to carry 200a.
You didn't take your masters test yet, did you.

 The Following 3 Users Say Thank You to beenthere For This Useful Post: frenchelectrican (03-07-2012), Speedy Petey (03-07-2012), user1007 (03-07-2012)
 03-07-2012, 05:27 PM #12 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 xxxxxxxxxxxxx two screwups are better than one Last edited by Yoyizit; 03-07-2012 at 06:01 PM.
 03-07-2012, 05:59 PM #13 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 From http://en.wikipedia.org/wiki/American_wire_gauge copper, 90C, a simple formula that gets you very close to these values is CM = 16.64 x amps^1.7 + 1631 E.g., amps = 25 CM= 3959 amps = 95 CM= 38306 amps = 260 CM= 212122 Last edited by Yoyizit; 03-07-2012 at 06:39 PM.
03-07-2012, 11:56 PM   #14
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Quote:
 Originally Posted by Yoyizit xxxxxxxxxxxxx two screwups are better than one
Seldom with electricity. I ask again. Amps married to which voltage. The poor boy is just trying to make a chart which I think already exists. Help him out with wire gauge at 200 amps at 24v just for example to turn a landscape light on. How many amps at 12v, and at what wire size does it take to start the engine of a car?

Last edited by user1007; 03-08-2012 at 12:07 AM.

03-08-2012, 12:32 AM   #15
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Quote:
 Originally Posted by sdsester Seldom with electricity. I ask again. Amps married to which voltage. The poor boy is just trying to make a chart which I think already exists. Help him out with wire gauge at 200 amps at 24v just for example to turn a landscape light on. How many amps at 12v, and at what wire size does it take to start the engine of a car?
When it comes to amps....voltage is not an issue....100 amps at 12v is no different than 100 amps at 1000v.......it is still 100amps.....now, if your talking watts....big difference....

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