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52
Cooper B-Line, Inc Cable Tray Manual
CABLE TRAY SIZING FLOWCHART
Appendix Sheet 8
392.12
W ≥ Sd
(single layer)
392.3(B)(1)(a)
Not permitted
by the NEC
®
392.10
Not
recognized by
the NEC
®
392.10(B)
W ≥ Sd
392.10(A)(1)
W ≥ Sd
392.10(A)(2)
W ≥ A/1.1
Note: The value “A”
only applies to cables
250 up to 1000kcmil.
The value “sd” only
applies to 1000 kcmil
and larger cables.
Note: Use when mixing
250 thru 1000 kcmil
cables with cables larger
than 1000 kcmil.
392.10(A)(3)
392.10(A)(4)
W ≥ Sd
(9” max. RS)
2000V
or less
cables
Multi-
conductor
cables
S/C 1/0
or larger
Ladder
or Vented
Trough
Tray
S/C
1000
kcmil or
larger
S/C
250
kcmil up to
1000
kcmil
S/C
250 kcmil
and
larger
S/C 1/0
thru 4/0
Vented
Channel
Tray
Solid
Bottom
Tray
W ≥ A/1.1 +Sd
No
No
No
No
No No No
No
Yes
Yes
Yes
Yes
YesYes Yes
Yes
Yes
Continued
on next
page
Yes
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
Start
Here
Sizing Cable Tray Per NEC 392