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.