Charles R. Miller
Member
I am currently writing a series titled "Sizing Conductors" in Electrical Contractor Magazine. Find the conductor size in this example before it is published in the September issue.
"What size THHN copper conductors are required to supply a branch circuit under the following conditions? The load will be a 39-ampere, non-motor, continuous load. These branch-circuit conductors will be in a raceway. There will be a total of eight current-carrying conductors and an equipment grounding conductor in this raceway. The terminations on both ends are rated at least 75?C. The maximum ambient temperature will be 40?C."
"What size THHN copper conductors are required to supply a branch circuit under the following conditions? The load will be a 39-ampere, non-motor, continuous load. These branch-circuit conductors will be in a raceway. There will be a total of eight current-carrying conductors and an equipment grounding conductor in this raceway. The terminations on both ends are rated at least 75?C. The maximum ambient temperature will be 40?C."