ST Rung

This is the upgrade slotted rung for all aluminum ladder cable trays with 6", 9", or 12"" rung spacing, but is the standard rung for all aluminum ladder cable trays with 18" rung spacing. This rung is also available for all aluminum ladders for extremely heavy load applications. ST rungs are installed alternating slot up and slot down.

RUNG TYPE MECHANICAL PROPERTIES
AH
SLOTTED† Minumum thickness = 0.105"
Moment of Inertia: 1x = 0.0531 in4
Section Modulus: Sx = 0.0917 in3
RUNG
SPACING
LOAD
TABLE
SAFE LOAD LIMITS (LBS/FT)
TRAY WIDTH (IN.)
6 9 12 18 24 30 36 42 48
6"
1
6602 4402 3301 2201 1651 1320 1100 943 825
2
6602 4402 3301 2201 1604 1123 803 574 402
9"
1
4402 2934 2201 1467 1100 880 734 629 550
2
4402 2934 2201 1467 1069 749 535 382 268
12"*
1
3301 2201 1651 1100 825 660 550 472 413
2
3301 2201 1651 1100 802 562 401 287 201
18"
1
2201 1467 1100 734 550 440 367 314 275
2
2201 1467 1100 734 535 374 268 191 134
1

Safe Load/Cable Load Only: Allowable uniformly-distributed cable load expressed in lbs/linear foot of tray length, based on the load carrying capability of the rung with a safety factor of 1.5. To convert Safe Load/Cable Load Only to reflect a safety factor of 2.0, multiply the safe loads shown by 0.75.

2

Safe Load / Cable Load +200 lbs: Allowable uniformly-distributed cable load expressed in lbs/linear foot of tray length, based on the load carrying capability of the rung with a 200 lb. concentrated static load applied at the center of the rung, without collapse.

3

Will not support a 200 lb. concentrated static load applied at the center of the rung.

[XX] Two digit code in the safe load limit tables indicates recommended rung option for specified width.

* Single rung load capacity: The data shown for 12" rung spacing is equivalent to the load capacity of the single rung.

† Slotted rungs are installed alternating slot up and slot down.