mstrlucky74
Senior Member
- Location
- NJ
I am assuming based on tempature rating chart(310.13) that #18 does come in THHN. Correct? Thanks.
I am assuming based on tempature rating chart(310.13) that #18 does come in THHN. Correct? Thanks.
If you need 18AWG you will likely need to go with type MTW.
The chart you mentioned has moved to 310.104 in 2011 NEC
They are asking for (2) #18 AWG wire from a set of contacts on a disconnect switch to a controller. There is no spec and thats all they say. I will assume a control cable(non plenum) in pipe and qualify.
TFFN is not in table 310.104(A)thhn is not made smaller than #14.
tffn is the closest under #14.
thhn is not made smaller than #14.
tffn is the closest under #14.
Incorrect. We install #16 thhn for control wiring all the time. Mostly for coil voltage for contactors for our defrost panels in grocery stores. It comes on 500' rolls just like the larger sized wire. It is a common item at our supply counter.
Never really looked hard. Will have to do so next time. Always ordered it as thhn and never been questioned on it