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Conduit Fill Capacity

January 1, 2005 By Leave a Comment

This is a great resource for anyone planning or performing structured wiring installations. We have used this table in the past to make sure we size conduits appropriately for current need + room for expansion.

trade
size

inside
diam. inch

inside
diam. mm
cable
outside diameter mm (in)

3.3
(0.13)
4.6
(0.18)
5.6
(0.22)
6.1
(0.24)
7.4
(0.29)
7.9
(0.31)
9.4
(0.34)
13.5
(0.53)
15.8
(0.62)
17.8
(0.70)
1/2 .622 16 1 1 0 0 0 0 0 0 0 0
3/4 .824 21 6 5 4 3 2 2 1 0 0 0
1 1.049 27 8 8 7 6 3 3 2 1 0 0
1-1/4 1.380 35 16 14 12 10 6 4 3 1 1 1
1-1/2 1.610 41 20 18 16 15 7 6 4 2 1 1
2 2.067 53 30 26 22 20 14 12 7 4 3 2
2-1/2 2.469 63 45 40 36 30 17 14 12 6 3 3
3 3.068 78 70 60 50 40 20 20 17 7 6 6
3-1/2 3.548 91 MAX MAX MAX MAX MAX MAX 22 12 7 6
4 4.026 103 MAX MAX MAX MAX MAX MAX 30 14 12 7
typical
2-pair CAT3 cable
typical
4-pair CAT3 cable
typical
4-pair CAT5E cable
typical
4-pair CAT6 (without divider) cable
typical
4-pair CAT6 (with divider) or 4-pair ScTP cable
typical
12-pair CAT3 unshielded cable
typical
25-pair CAT3 unshielded cable
typical
50-pair CAT3 unshielded cable
typical
50-pair CAT3 shielded ARMM cable
typical
100-pair CAT3 unshielded cable
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