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#39958 - 07/09/04 05:05 PM 18 awg ampacities  
drgnz23  Offline
Joined: Feb 2002
Posts: 56
los angeles
was is the allowable ampacities for 18 awg thhn

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#39959 - 07/09/04 07:45 PM Re: 18 awg ampacities  
George Corron  Offline
Joined: May 2001
Posts: 717
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

#39960 - 07/09/04 07:58 PM Re: 18 awg ampacities  
Ryan_J  Offline
Joined: Aug 2003
Posts: 1,374
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

#39961 - 07/10/04 06:23 PM Re: 18 awg ampacities  
drgnz23  Offline
Joined: Feb 2002
Posts: 56
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

#39962 - 07/10/04 06:49 PM Re: 18 awg ampacities  
iwire  Offline
Joined: Jan 2003
Posts: 4,391
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

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