Clearance for installation

Clearance is the distance between the top of the uppermost cable in the conduit andthe inner top surface of the conduit. It should be at least 10% of the conduit innerdiameter or one inch for large cables or installations involving numerous bends.Equations for calculating clearance (CL) are presented as follows:

For single cable

CL=D-d

For three cables, triplexed, triangular(E-24)

CL=D/2-1,366*d+(D-d)/2*(1-(d/(D-s))^2)^0,5

For three cables, cradles

CL=D/2-d/2+(D-d)/2*(1-(d/(D-s))^2)^0,5

where:

D= conduit inner diameter, in inches
d= cable outer diameter, in inches

When calculating clearance, ensure all cable diameters are equal. If in doubt, use thetriplexed configuration equation. The cables may be single or multiple-conductorconstruction