CABLE TRAY SIZING FLOWCHART
Ampacity: See pages 36 - 38 for information on cable ampacity that might affect the cable tray sizing flowchart.
See pages 15 - 17 for information on hazardous (classified) areas that might affect the cable tray sizing flowchart.
Yes | Ladder |
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or Vented |
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| M/C 4/0 | Yes | 392.9(A)(1) |
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Solid |
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Bottom |
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Tray |
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M/C 4/0 | Yes | 392.9(C)(1) |
| One M/C | Yes | 392.9(E)(1) | ||||||||
W ≥ Sd/0.9 |
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or larger |
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| W x D ≥ 1.6A | |||||
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M/C | Yes |
| 392.9(A)(2) |
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smaller |
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| W ≥ A/1.2 |
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than 4/0 |
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| No |
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M/C | Yes |
| 392.9(A)(3) | |||
smaller than |
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4/0, with |
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4/0 or |
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larger |
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Note: The value “A” only applies to cables smaller than 4/0.
No The value “Sd” only applies to 4/0 and larger cables, which must be single layer
M/C | Yes | 392.9(B) | |
control |
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signal |
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M/C | Yes | 392.9(C)(2) |
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smaller |
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than 4/0 |
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| No |
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| 392.9(C)(3) | ||
M/C | Yes | ||||||
smaller than |
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4/0, with |
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| W ≥ | A + Sd | |||
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4/0 or |
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larger |
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Note: The value “A” only applies to cables smaller than 4/0.
No The value “Sd” only applies to 4/0 and larger cables, which must be single layer
M/C Yes | 392.9(D) | |||
control |
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| W x D ≥ 2.5A | |
signal | ||||
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392.9(E)(2) | No | One | |
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W x D ≥ 2.9A |
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Yes
392.9(F)(2) | 392.9(F)(1) |
W x D ≥ 3.2A | W x D ≥ 1.9A |
Legend
W = Cable Tray Width
D = Cable Tray Load Depth Sd = Sum of Cable Diameters A = Sum of Cable Areas S/C = Single Conductor M/C = Multiconductor Cables RS = Ladder Rung Spacing
Cable Tray Manual
Appendix Sheet 8
Cooper B-Line, Inc
53
