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#39958 - 07/09/04 02:05 PM 18 awg ampacities
drgnz23 Offline
Member

Registered: 02/17/02
Posts: 56
Loc: los angeles
was is the allowable ampacities for 18 awg thhn

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#39959 - 07/09/04 04:45 PM Re: 18 awg ampacities
George Corron Offline
Member

Registered: 05/16/01
Posts: 728
Loc: Lorton, Va USA
Not allowed for General use, they are allowed for Fire Alarm systems (and a few other exceptions), the ampacity given in 760-23 is 7 amperes, and 6 amperes (from table 402-5) from 760-27

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#39960 - 07/09/04 04:58 PM Re: 18 awg ampacities
Ryan_J Offline
Moderator

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
Table 402.5 list 18 AWG at 6 amps, but as George said, 18 AWG is very limitted in its use.

THHN is not listed as a fizxture wire, but TFN and TFFN seem to have similiar characteristics.

What is this being used for?
_________________________
Ryan Jackson,
Salt Lake City

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#39961 - 07/10/04 03:23 PM Re: 18 awg ampacities
drgnz23 Offline
Member

Registered: 02/17/02
Posts: 56
Loc: los angeles
this was the question my foreman gave me. So i looked it up but was using table 310.15 and was confused, so i decided to ask you guys

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#39962 - 07/10/04 03:49 PM Re: 18 awg ampacities
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
It is listed as 14 amps @ 90 C in 310.16.

Now what can I conect it to that is rated 90 C?

310.16 shows no rating for 18 AWG @ 75 or 60 C.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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