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Joined: Feb 2002
Posts: 56
OP
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was is the allowable ampacities for 18 awg thhn
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Joined: May 2001
Posts: 717
Member
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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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Joined: Aug 2003
Posts: 1,374
Moderator
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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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Joined: Feb 2002
Posts: 56
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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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Joined: Jan 2003
Posts: 4,391
Moderator
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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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Posts: 28
Joined: May 2007
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