3000 Raceway Wire Fill Capacity for Power*
Wire Size
THHN/THWN
O.D. Number of Conductors (40% Fill)
inches [mm] Without
Devices
With Duplex/
Rect. Devices
1.59in.² (1025mm)
With Surge/
GFCI Devices
2.30in.² (1485mm)
Large Single
Receptacles
3.00in.² (1935mm)
14 AWG 0.111 [2.8] 152 70 40 28
12 AWG 0.130 [3.8] 111 51 29 21
10 AWG 0.164 [4.2] 70 32 18 13
8 AWG 0.216 [5.5] 40 18 10 7
6 AWG 0.254 [6.5] 29 13 7 5

3000 Raceway Wire Fill Capacity for Communications
  O.D. (Approx. Dia)  
  Cable wire Size inches [mm] 20%* Fill 40%** Fill
UNSHIELDED
TWISTED PAIR
4-pair, 24 AWG, Cat 3
4-pair, 24 AWG, Cat 5e
4-pair, 24 AWG, Cat 6
0.190
0.210
0.250
[4.8]
[5.3]
[6.3]
26
21
15
52
42
30
TELEPHONE 2-pair, 24 AWG
3-pair, 24 AWG
4-pair, 24 AWG
25-pair, 24 AWG
0.140
0.150
0.190
0.410
[3.6]
[3.8]
[4.8]
[10.4]
48
41
26
5
96
83
52
11
COAXIAL RG58/U
RG59/U
RG62/U
RG6/U
0.195
0.242
0.242
0.270
[5.0]
[6.1]
[6.1]
[6.9]
24
16
16
12
49
32
32
25
TWINAXIAL 100 Ohm 0.330 [8.4] 8 17
SHIELDED
TWISTED PAIR
Type 1
Type 2
Type 3
0.390
0.465
0.245
[9.9]
[11.8]
[6.2]
6
4
15
12
8
31
FIBER Mini ZipCord
ZipCord
Round 4 Strand Fiber
Round 6 Strand Fiber
0.079 x 0.157
0.118 x 0.236
0.187
0.256
[2 x 4]
[3 x 6]
[4.8]
[6.5]
59
26
26
14
119
53
53
28

* 20% cable fill is calculated to approximate reduction in cable capacity due to connectors mounted with raceway and fittings that may restrict cross sectional area.

** 40% cable fill is the maximum designed cable based on a proposed revision to TIA/EIA 569-A.