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

#39959 07/09/04 07:45 PM
Joined: May 2001
Posts: 717
G
Member
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
Joined: Aug 2003
Posts: 1,374
R
Moderator
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
Joined: Feb 2002
Posts: 56
D
drgnz23 Offline OP
Member
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
Joined: Jan 2003
Posts: 4,391
I
Moderator
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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