Conduit clearance

Clearance in duct is the distance between the top of the uppermost cable in the conduit and the inner top surface of the conduit. It should be at least 10% of the conduit inner diameter or one inch for large cables or installations involving numerous bends.

Symbol
$CC_{p}$
Unit
%
Formulae
$- D_{e} + Di_{d}$1 cable
$- 2 D_{e} + Di_{d}$2 cables
$- 1.366 D_{e} + \frac{Di_{d}}{2} + \sqrt{- \frac{D_{e}^{2}}{2 \left(- D_{e} + Di_{d}\right)} + 1}$3 cables (triangular)
$- \frac{D_{e}}{2} + \frac{Di_{d}}{2} + \sqrt{- \frac{D_{e}^{2} \left(- D_{e} + Di_{d}\right)}{2 \left(- 2 D_{e} + 2 Di_{d}\right)^{2}} + 1}$3 cables (cradled)
$- 2 D_{e} + Di_{d}$4 cables (diamond)
Related
$D_{e}$