NM2000 Raceway Wire Fill Capacity for Power
Wire Size
THHN/THWN
O.D. Number of Conductors
inches [mm]
14 AWG 0.111 [2.8] 45
12 AWG 0.130 [3.8] 31
10 AWG 0.164 [4.2] 15

NM2000 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]
11
9
6
5
4
3
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]
20
18
11
2
10
9
5
1
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]
10
6
6
5
5
3
3
2
TWINAXIAL 100 Ohm 0.330 [8.4] 3 1
SHIELDED
TWISTED PAIR
Type 1
Type 2
Type 3
0.390
0.465
0.245
[9.9]
[11.8]
[6.2]
2
1
6
1
0
3
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]
25
11
11
6
12
5
5
3

** 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 fill based on a proposed revision to TIA/EIA 569-A.