392.9(F)(2)
The fill areas for combinations of multiconductor cables of any type installed in solid channel cable tray.
Solid Channel | Maximum Allowable |
Cable Tray Size | Fill Area |
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2 Inch Wide | 0.8 Square Inches |
3 Inch Wide | 1.1 Square Inches |
4 Inch Wide | 2.1 Square Inches |
6 Inch Wide | 3.2 Square Inches |
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392.10.Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays.
Installation of single conductors in cable tray is restricted to industrial establishments where conditions of maintenance and supervision assure that only qualified persons will service the installed cable tray systems. Single conductor cables for these installations must be 1/0 or larger, and they may not be installed in solid bottom cable trays.
392.10.Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays. (A) Ladder or Ventilated Trough Cable Trays. (1) 1000 KCMIL or Larger Cables
The sum of the diameters (Sd) of all single conductor cables shall not exceed the cable tray width.
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Single | In. | Area |
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Conductor | (Note) | Sq. | 6 | 9 | 12 | 18 | 24 | 30 | 36 | 42 |
Size | #1 | In. | In. | In. | In. | In. | In. | In. | In. | In. |
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1/0 | 0.58 | 10 | 15 | 20 | 31 | 41 | 51 | 62 | 72 | |
2/0 | 0.62 | 9 | 14 | 19 | 29 | 38 | 48 | 58 | 67 | |
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3/0 | 0.68 | 8 | 13 | 17 | 26 | 35 | 44 | 52 | 61 | |
4/0 | 0.73 | 8 | 12 | 16 | 24 | 32 | 41 | 49 | 57 | |
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250 Kcmil | 0.84 | 0.55 | 11 | 18 | 24 | 35 | 47 | 59 | 71 | 82 |
350 Kcmil | 0.94 | 0.69 | 9 | 14 | 19 | 28 | 38 | 47 | 57 | 65 |
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500 Kcmil | 1.07 | 0.90 | 7 | 11 | 14 | 22 | 29 | 36 | 43 | 50 |
750 Kcmil | 1.28 | 1.29 | 5 | 8 | 10 | 15 | 20 | 25 | 30 | 35 |
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1000 Kcmil | 1.45 | 4 | 6 | 8 | 12 | 16 | 20 | 24 | 28 | |
Notes:
#1. Cable diameter's used are those for Okonite- Okolon 600 volt single conductor power cables.
#2. 42 inch wide is ladder cable tray only.
#3. Such installations are to be made only in qualifying industrial facilities as per Sections 392.3(B) & (B)(1).
#4. To avoid problems with unbalanced voltages, the cables should be bundled with ties every three feet or four feet. The bundle must contain the circuit's three phase conductors plus the neutral if one is used.
#5. The single conductor cables should be firmly tied to the cable trays at six foot or less intervals.
392.10.Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays. (A) Ladder or Ventilated Trough Cable Trays. (3) 1000 KCMIL or Larger Cables Installed With Cables Smaller Than 1000 KCMIL.
Such installations are very rare.
392.10.Number of Single Conductor Cables, Rated 2000 Volts or Less, in Cable Trays. (A) Ladder or Ventilated Trough Cable Trays. (2) 250 KCMIL to 1000 KCMIL Cables
Number Of 600 Volt Single Conductor Cables That May Be Installed In Ladder Or Ventilated Trough Cable Tray - Section 392.10(A) (2)
392.10.Number of Single Conductor Cables, Rated 2000 Volts or Less in Cable Trays. (A) Ladder or Ventilated Trough Cable Trays. (4) Cables 1/0 Through 4/0
The sum of the diameters (Sd) of all 1/0 through 4/0 cables shall not exceed the inside width of the cable tray.
Cable Tray Manual | Cooper |
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