The answer to this questions depends on:


1: What is the allowable temperature rise of the wire. A lower temperature
rise means a larger gauge wire. Note the the allowable rise for a given type
of wire will depend on the insulation type.

2: How the individual wires are arranged in  a cable or conduit. If they are
bundled together then they will get hotter than if they are separate.

3: What is the allowable voltage loss over the length of the wire. Less
voltage loss means a larger gauge wire.

Bob Ammerman
RAm Systems

----- Original Message -----
From: "Micro Eng" <micro_eng@HOTMAIL.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, May 29, 2002 1:45 PM
Subject: [EE]:formula/link for current capacity of wire (AC)


> ok..power guys...
>
> Whats the formula, given that I have the current and voltage, to calculate
> the wire size that is required.
>
> I'm talking large amounts of current...like 833Amps @120VAC
>
> I know for 200A, I need a 4/0 wire.
>
> Distances are rather short, something like 20 feet or less.
>
>
> anyone?
>
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