cable is installed, the sum of the cross-sectional area of all cable shall not exceed the value specified in Column 2 of Table 392.9(F).
392.10 Number of Single-Conductor Cables, Rated
2000 Volts or Less, in Cable Trays. The number of
single-conductor cables, rated 2000 volts or less,
permitted in a single cable tray section shall not exceed
the requirements of this section. The single conductors,
or conductor assemblies, shall be evenly distributed
across the cable tray. The conductor sizes herein apply
to both aluminum and copper conductors.
(A) Ladder or Ventilated Trough Cable Trays. Where ladder or ventilated trough cable trays contain single- conductor cables, the maximum number of single conductors shall conform to the following:
Table 392.9(E) Allowable Cable Fill Area for Multiconductor Cables in Ventilated Channel Cable Trays for Cables Rated 2000 Volts or Less
Maximum Allowable Fill Area for
Multiconductor Cables
(B) Ventilated Channel Cable Trays. Where 50 mm (2 in.), 75 mm (3 in.), 100 mm (4 in.), or 150 mm (6 in.) wide ventilated channel cable trays contain single conductor cables, the sum of the diameters of all single conductors shall not exceed the inside width of the channel.
|
Column 2 |
||
|
Inside Width of Cable Tray |
Column 1 One Cable |
More Than One Cable |
mm in. mm 2 in.2 mm2 in.2
|
75 |
3 |
1500 |
2.3 |
850 |
1.3 |
|
100 |
4 |
2900 |
4.5 |
1600 |
2.5 |
|
150 |
6 |
4500 |
7.0 |
2450 |
3.8 |
Table 392.9(F) Allowable Cable Fill Area for Multiconductor Cables in Solid Channel Cable Trays for Cables Rated 2000 Volts or Less
|
Column 2 |
||
|
Inside Width of |
Column 1 |
More Than |
|
Cable Tray |
One Cable |
One Cable |
mm in. mm 2 in.2
50 2 850 1.3
75 3 1300 2.0
100 4 2400 3.7
150 6 3600 5.5
(1) Where all of the cables are 1000 kcmil or larger, the sum of the diameters of all single-conductor cables shall not exceed cable tray width, and the cables shall be installed in a single layer. Conductors that are bound together to comprise each circuit group shall be permitted to be installed in other than a single layer.
(2) Where all of the cables are from 250 kcmil through
900 kcmil, the sum of the cross-sectional areas of
all single-conductor cables shall not exceed the
maximum allowable cable fill area in Column 1 of
Table 392.10(A) for the appropriate cable tray
width.
(3) Where 1000 kcmil or larger single-conductor cables are installed in the same cable tray with single- conductor cables smaller than 1000 kcmil, the sum of the cross-sectional areas of all cables smaller than 1000 kcmil shall not exceed the maximum allowable fill area resulting from the computation in Column 2 of Table 392.10(A) for the appropriate cable tray width.
(4) Where any of the single conductor cables are 1/0 through 4/0 AWG, the sum of the diameters of all single conductor cables shall not exceed the cable tray width.