Cable Tray Support Requirements

An economical support for cable drops and branch cable runs from the backbone cable tray system.

Cable tray support requirements.

Plenum cable can be used only in environmental air handling areas. Load and support requirements. Because cable trays offer flexibility for expansion and changes engineers and designers should design and size cable tray systems to anticipate both current and future needs. Cable tray is a mechanical support system for cables and raceways.

In a closed system such as raceway wireway or solid bottom tray with solid covers plenum cable is not required by the nec. Mushroom headed steel roofing bolts and nuts shall be used for the installation and coupling of trays. If used in these areas it must be supported in an open cable support system such as cable runway center rail and ladder type cable tray. Be strong and rigid they need to be able to support all of the wiring they re going to contain have smooth edges burrs sharp edges and other projections can damage cable jackets and insulation be protected from corrosion hot dip galvanization or powder coating is must.

Fg 1 fiberglass cable tray systems covers construction and test requirements for continuous complete nonmetallic systems of ladder ventilated solid bottom cable trays or channel type trays intended for the support of power or control cables or both. Cable trays shall be supported by mild steel galvanized brackets at regular intervals of 1 2mm maximum and at 255mm from bends and tees. Standard depths of 1 1 inches in metal systems and 1 1 1 8 1 5 and 2 3 16 inches in nonmetallic systems. Standard widths of 3 4 and 6 inches in metal systems and up to 8 inches in nonmetallic systems.

Hazardous voltages in electrical equipment can cause severe personal injury or death. 29 cfr 1910 303 b 8 requires the appropriate mounting and cooling of electrical equipment. Under nec article 392 metallic cable trays are required to.