Conduit Fill Capacity

Question 1

Calculate what size conduit is required for the following 3 cables and if a jam will occur.

Cable 1: .298”
Cable 2: .332”
Cable 3: .212

Answer 1

.78” Minimum Conduit

Using 1” Conduit, Jam Ratio is 3.56

Jamming will not occur.

Question 2

Calculate what size conduit is required for the following 3 cables and if a jam will occur.

Cable 1&2: .420”
Cable 3: .650

Answer 2

1.39” Minimum Conduit

Using 1.5” Conduit, Jam Ratio is 3.02

Jamming will occur.

Question 3

Calculate what size conduit is required for the following 3 cables and if a jam will occur.

Cable 1: .650
Cable 2: .235
Cable 3: .235

Answer 3

1.154” Minimum Conduit

Using 1.25 Conduit, Jam Ratio is 3.348

Jamming will not occur