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Cooper B-Line, Inc Cable Tray Manual
Cable Tray Label
392.8. Cable Installation. (A) Cable
Splices.
There is no safety problem due to cable splices
being made in cable trays if quality splicing kits are
used, provided that the splice kits do not project
above the siderails and that they are accessible. A
box or fitting is not required for a cable splice in a
cable tray
392.8. Cable Installation. (B) Fastened
Securely.
There is no safety or technical reason to tie down
multiconductor cables in horizontal cable tray runs
unless the cable spacing needs to be maintained or
the cables need to be confined to a specific location
in the cable tray. In non-horizontal cable tray runs,
small multiconductor cables should be tied down at
3 or 4 foot intervals and larger (1 inch diameter and
above) Type MC and Type TC multiconductor
cables should be tied down at 6 foot intervals. If
used outdoors, plastic ties should be sunlight,
ultraviolet (UV), resistant and be made of a material
that is compatible with the industrial environment.
Installed outdoors, white nylon plastic ties without a
UV resistant additive will last 8 to 14 months before
breaking. Also available for these applications are
stainless steel ties and P-clamps.
(P-Clamp shown installed on industrial aluminum rung)
For single conductor cables installed in cable tray
in a single layer, each single conductor cable should
be tied to the cable tray at 6 foot intervals. Where a
circuit group of single conductors (Phase A, Phase
B, Phase C, and a Neutral if used) are bound
together with ties, the ties should be at three or four
foot intervals. In horizontal cable tray runs, the
circuit groups with ties do not have to be tied to the
cable tray. Where ties are used, they should be
made from high strength UV resistant plastic or
stainless steel. The high amperages flowing under
fault conditions in the 1/0 and larger cables
produce strong magnetic fields which result in the
conductors repelling each other until the circuit
protective device de-energizes the circuit. Under
such conditions, the cables might be forced out of
the cable tray. This happened at a northern Florida
textile plant where several hundred feet of Type MV
single conductor cable was forced out of a cable tray
run by an electrical fault because the cables were not
tied down properly.
WARNING!
Use Only As A Mechanical Support For Cables, Tubing and Raceways.
Do Not Use As A Walkway, Ladder,
Or Support For Personnel.
VENTILATED
09/05/2002
816 LIONS DRIVE
TROY, IL 62294
(618) 667-6779
Catalog Number: 24A09-12-144 STR SECTION
(and description)
Shipping Ticket: 260203 00 001
Mark Number: 78101115400
Purchase Order: D798981
Minimum Area: 1.000 SQ. IN.
Load Class: D1 179 KG/M 3 METER SPAN
REFERENCE FILE # LR360266
This product is classified by Underwriters Laboratories, Inc. as to
its suitability as an equipment grounding conductor only. 556E
30781011154005
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