What is the ampacity for 8 AWG wire? 50 or 40
Every electrician I ask tell me different story
This is important since wire are very expensive
I am need to connect an air-condition rated 240 50 Amp 3 wires (2 hot and ground)
According to the NEC
Table 310.16 Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F)
Types RHW, THHW, THW, THWN, XHHW, USE, ZW
For 60°C (140°F) is 40 amp
And for 75°C (167°F) is 50 amp
What is this temperature? Is it the temperature in the attic where I put the wire?
Also from the NEC 2002 book
8 AWG THHN, 90°C copper wire is limited to 40 amperes where connected to a disconnect switch with terminals rated at 60°C. This same 8 AWG THHN, 90°C wire is limited to 50 Amp
Can someone tell me if I can use 8 AWG THHN
My contact: Electrical contractor, Electrician Santa Monica CA, Venice CA, Mar Vista, Culver City Westchester CA
[email protected]
310-699-9444
Thank you