Cooper Bussmann CT02MAN manual Yes Ladder Or Vented Trough

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			No
	or Vented
	Trough
	Tray
		Yes
	M/C 4/0		Yes	392.9(A)(1)
				W ≥ Sd
	or larger
				(single layer)
		No

Solid			No	Vented			No	Solid
Bottom				Channel				Channel
Tray				Tray				Tray
	Yes				Yes
M/C 4/0		Yes	392.9(C)(1)	One M/C		Yes		392.9(E)(1)
			W ≥ Sd/0.9
or larger				only				W x D ≥ 1.6A
			(single layer)
	No				No

M/C		Yes		392.9(A)(2)
smaller
				W ≥ A/1.2
than 4/0
	No
M/C		Yes		392.9(A)(3)
smaller than
4/0, with			W ≥ A/1.2 + Sd
4/0 or
larger

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
and/or		W x D ≥ 2A
signal

M/C		Yes	392.9(C)(2)
smaller
			W ≥ A/0.9
than 4/0
	No
			392.9(C)(3)
M/C		Yes
smaller than
4/0, with			W ≥	A + Sd
4/0 or
larger			0.9

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
and/or	W x D ≥ 2.5A
signal

392.9(E)(2)	No	One
		M/C
W x D ≥ 2.9A
		Only

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