Styles of tray there are three different styles of cable tray.
Cable tray loading classes.
Code cable tray systems are manufactured to conform to the standard load classes of csa as follows.
These systems have 2 wide side rail flanges and 4 hole splice plates.
Cable load working load the cable load or the working load is the total weight of the cables to be placed in the tray.
Cable load foot 49 cables 20 lb 1000 ft.
This is the total weight of cables in the tray.
Channel cable tray ladder cable tray single rail cable tray wire mesh cable tray solid bottom or nonventillated cable tray and trough or ventilated cable tray and associated fittings for use in accordance with the rules of the national electrical code.
Select tray sizethere are different widths and heights of cable tray and what you require will depend on number size spacing and weight of.
Cable load working load the cable load or the working load is the total weight of the cables to be placed in the tray.
Which is subject to change at any time.
The nema classes are based on cable loads of 50 75 and 100 per lineal foot.
Class 1 tray fittings are designed for use with nema classes 12b and 12c cable trays.
Ladder ventilated solid 4.
For purposes of selecting.
This table for cable tray sizes is provided by hoffman enclosures inc.
Cope is the original brand of cable tray.
Nema ve 1 this standard specifies the manufacturing requirements for metal cable trays such as.
Class 3 tray fittings are designed for use with cable trays with.
The nema classes are based on cable loads of 50 75 and 100 per lineal foot.
Today the cope brand is part of atkore international and is the premier producer of all major categories of cable tray systems.
These systems have 1 1 8 wide side rail flanges and 4 hole splice plates.
2 select the tray class load capacity loading the standard classes of cable trays as related to their maximum design loads and to the associated design support spacing based on a simple beam span requirement shall be designated in accordance with table 1.
Select the type of traythere are three different types of cable tray.
See nema ve 1 and manufacturer s data.
Please note the load ratings in table 1 are those most commonly used.
The number and type of conductors that can be installed in a cable tray is also limited by the weight of the cables and other load factors for the cable tray for a given load rated cable tray.
This is the total weight of cables in the tray.
In 1948 thomas jefferson cope developed the first modular cable tray system and introduced it to the electrical industry.
Ladder ventilated solid select tray size width and height code cable tray systems are manufactured to conform to the standard load classes of csa as follows.
Class 2 tray fittings are designed for use with nema class 20a 20b and 20c cable trays.
