Bundled Bare Conductor Derating
Bundled Bare Conductor Derating
(OP)
I'm trying to determine the ampacity rating of three 1590 AAC in parallel arranged in a flat configuration 2 inches apart. I have calculated the ampacity for a single conductor using the IEEE method and understand how to calculate the proximity effect of the conductors. Is there any additional derating I need to consider? I think to be conservative the amapacity of the two conductors on the leeward side of the first conductor should be calculated with no wind. Would this be a correct assumption?






RE: Bundled Bare Conductor Derating
See ch. 3.4.3 Forced convection heat loss rate
“Equation (3a) applies at low winds but is incorrect at high wind speeds. Equation (3b) applies at high wind
speeds, being incorrect at low wind speeds. At any wind speed, the larger of the two calculated convection
heat loss rates is used.”
RE: Bundled Bare Conductor Derating
RE: Bundled Bare Conductor Derating
The solar heating has to be added.
Usually, if the conductors are laid in a horizontal row and the clearance between conductors is more than twice the conductor diameter, no derating is required.
RE: Bundled Bare Conductor Derating