Wire guage amps vs length

[etcswjoe]

From the follow on post I guess it was not such a great idea so I deleted it. Hope I did not cause too much confusion

Edited March 11, 2013 by etcswjoe

[Pegasus1300]

Thats a great chart,Thanx.

[wrenchrob]

thanks!

[Marcarl]

Can we put this in the tech section,,,,,,awe PLEASE?

[gwashorn]

Strange chart of sizing since it does not state the percent voltage drop it is based against. I am assuming this if meant for motor starting of the starter which can stand a higher percent voltage drop. Standard industrial plants voltage drop for most distribution systems is design max of 3% which for most loads let you go several hundred feet. So you need a voltage drop parameter for the chart. This table suggests an extreme amount of drop. Just something to keep in mind.

[etcswjoe]

Strange chart of sizing since it does not state the percent voltage drop it is based against. I am assuming this if meant for motor starting of the starter which can stand a higher percent voltage drop. Standard industrial plants voltage drop for most distribution systems is design max of 3% which for most loads let you go several hundred feet. So you need a voltage drop parameter for the chart. This table suggests an extreme amount of drop. Just something to keep in mind.

 

 

Deffintly not perfect maybe a little overkill, but it worked for what I needed I guess I should not be lazy and do the the formula each time

.

[tazmocycle]

you need to look for what use that chart is used for, i've been doing electrical wiring for almost 40 yrs and wouldn't use that chart. most of it won't work for standard wiring in residental or commerical. also depends on how the wireing is installed, open air, wire tray or conduit. cold or hot areas are also considered when sizing wire sizes. to get an idea of whats required look up the national electrical code book and y'all see several differant wiring charts that covers a lot of differant situations.

http://ecmweb.com/code-basics/conductors-general-use

the outside area of the wire is where most of the electrons travel so that what they base most of their ratings on but differant materials used in the jacketing also makes a differants in the amp rating. uf cable is molded so moisture don't get into the wire and sr is sunlight resistence is made so sunlight won't break down the insulation material. the lenth of wire is figured in because voltage is what pushes the electron along the wire and the longer lengthscauses a drop in voltage, that why they use substation to boost the voltage back up to push it along. hope this helps out. after looking at the chart closer it's based on 12 volts but don't know if it's in freeair, bundled or conduit uses. so of the rating i still won't use some of it for wiring on car or bike.

Edited March 11, 2013 by tazmocycle

[Prairiehammer]

Here is a chart and other information specifically for automotive (12 volt) use.

[dingy]

Very similar info and more included in write up in tech section.

 

Wire gauging and fuse sizing is about halfway through.

 

The guy that wrote this was a legend in his own mind.

 

Relays 101

 

Gary

[gwashorn]

I think the chart is really for CRANKING of engines at 12 vdc. It fits pretty close to how the automotive and other industries size cable. Also, it depends on the strand count as noted. For example to keep wire size in large installations and bending radius we use locomotive wire due to the small strand high strand count for flexibility and current range for diameter of cable or wire size.

[Globewalker]

Very similar info and more included in write up in tech section.

 

Wire gauging and fuse sizing is about halfway through.

 

The guy that wrote this was a legend in his own mind.

 

Relays 101

 

Gary

 

Well that is an awesome compilation of electrical information!

[saddlebum]

you know if you just replace everything with 3/0 SJOW you should be pretty much covered for every eventuality