ECN Forum Forums General Topics of the Trade General Discussion Area 18 awg ampacities

was is the allowable ampacities for 18 awg thhn

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

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?

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

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.