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392.9(F)(2)
The fill areas for combinations of multiconductor
cables of any type installed in solid channel cable
tray.
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.
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. (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. (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.
35
Cable Tray Manual Cooper B-Line, Inc
Dia. (Note
Single In. Area #2)
Conductor (Note) Sq. 6 9 12 18 24 30 36 42
Size #1 In. In. In. In. In. In. In. In. In.
1/0 0.58 -- 10 15 20 31 41 51 62 72
2/0 0.62 -- 9 14 19 29 38 48 58 67
3/0 0.68 -- 8 13 17 26 35 44 52 61
4/0 0.73 -- 8 12 16 24 32 41 49 57
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
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
1000 Kcmil 1.45 -- 4 6 8 12 16 20 24 28
Cable Tray Width
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.
Solid Channel Maximum Allowable
Cable Tray Size Fill Area
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