Re: Wire Gauge sizes

Posted by Stickler on September 30, 2004 at 07:19:18 from (142.16.22.18):

In Reply to: Re: Wire Gauge sizes posted by Allan in NE on September 30, 2004 at 06:04:52:

Sorry Allan, but Ampacity = Current-carrying Capacity. It is a term widely used in the electrical industry. (yes, I work in said industry too, I operate a hydro-electric gernerating stations and HVDC converter stations) The NEC and the Canadian Electric Code include tables for allowable ampacities for various types of insulated and non-insulated conductors.

from:
Standard Handbook for Electrical Engineers
Fink & Carroll Tenth Edition 1969
McGraw Hill ISBN 07-020973-1

Current-carrying Capacity (Ampacity). As the conductors of an electrical wiring system offer some resistance, a current-carrying conductor dissipates heat. Under practical conditions of installation and operation the temperatures reached must not result in the destruction of the insulation or risk to surrounding materials.

snip, they show tables taken from the NEC here

Allowable ampacities for insulated conductors are based upon an allowable temperature rise above an ambient of 30�C, 86�F.
Allowable ampacities for copper conductors and aluminum conductors in accordance with the temperature rating of the insulation are given for installation in conduit and for installation in free air.

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• Re: Wire Gauge sizes txblu 08:08:32 09/30/04 (0)

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