Current carrying capacity of wire in conduit

[shood]

Is there any information avalible in the NEC dealing with de-rating the current carrying capacity of wires (3 being run in this case) in a rigid steel conduit.

Thanks in advance.

 

[Crowbar1]

Only three conductors in conduit do not require derating. For more than three conductors see Art.310.15B2. For ambient temperature corrections see Table 310.16 Correction factors.