Re: wire for motor ?

--- In CAD_CAM_EDM_DRO@yahoogroups.com, cnc002@... wrote:

>
>
> In a message dated 12/10/2006 9:52:28 PM Eastern Standard Time,
> kz1927@... writes:
>
> Hi Dave,
>
> Those ratings are for High Voltage Power Transmission...
>
> Open air wiring ratings are something like 30 and 40 amps for
> 14 & 12 ga.
>
> John
>
>
>
> If you notice, most AWG ampacity charts will show open air and "in

conduit"

> ratings, the ratings inside conduit will be less than those in open

air of

> course.

After reading about this, I do understand the difference in how it can
be used. as a wire in a panel, the characteristics are different that
that of a wire bundled in a 3 wire insulated package like Romex, or
that buried underground, or multiple wires in a bundle.

http://www.interfacebus.com/Reference_Cable_AWG_Sizes.html

is one of the first AWG tables to come up, and not the only one that
lists these apparently low ratings.

http://www.powerstream.com/Wire_Size.htm
list 41 amps for 12ga for chassi wiring and 9.3A for power transmission

I guess there were not too many good hits on google for 'awg wire amps'

Dave







Also, ratings for DC will be somewhat different than those for AC in

> many cases. I have always made it a rule to go one size over with

wire when

> designing machinery or when wiring in my home, just for safety's

sake. The

> extra cost of the wire isn't a lot more and the peace of mind is

worth it.

> Also, keep in mind that the number of wires you put in a conduit or

other

> enclosure where the wires are close to each other and parallel to

each other also

> has some effect on them
>
> Randy A.
>
>
> [Non-text portions of this message have been removed]
>