Cable Tray Support Requirements

Mushroom headed steel roofing bolts and nuts shall be used for the installation and coupling of trays.

Cable tray support requirements.

Load and support requirements. 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. Cable trays shall be supported by mild steel galvanized brackets at regular intervals of 1 2mm maximum and at 255mm from bends and tees. Plenum cable can be used only in environmental air handling areas.

Standard depths of 1 1 inches in metal systems and 1 1 1 8 1 5 and 2 3 16 inches in nonmetallic systems. In a closed system such as raceway wireway or solid bottom tray with solid covers plenum cable is not required by the nec. Hazardous voltages in electrical equipment can cause severe personal injury or death. Under nec article 392 metallic cable trays are required to.

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. 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. Using cable trays as walkways can cause personal injury and also damage cable tray and installed cables. 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.

Nema fg 1 was rescinded as a published standard in november 2017. 29 cfr 1910 303 b 8 requires the appropriate mounting and cooling of electrical equipment. Do not use a cable tray as a walkway ladder or support for people.