03/20/2006

Electrical Safety Hazards of Overloading Cable Trays

The US-American Institute of Occuaptional Safety and Health has published a new
fact sheet focussing on "Electrical Safety Hazards of Overloading Cable Trays".

Cable trays support cable across open spans in the same manner that roadway
bridges support traffic. Cable trays are not raceways, and are treated as a
structural component of a facility's electrical system. Cable trays are a part
of a planned cable management system to support, route, protect and provide a
pathway for cable systems.

Cable trays feature flexibility unmatched by conduit, as cables are easier to
mark, remove and find in cable trays. Cable trays are available in a number of
different configurations, including ladder, ventilated trough, ventilated
channel, solid bottom, wire mesh, single rail, and other similar structures.
They are manufactured in steel, aluminum, and fiber reinforced plastic (FRP),
although aluminum accounts for about 70% of the cable trays used in industry
today.

The fact sheet discusses the following hazards:

  • Overloading cable trays
  • Wiring methods permitted in cable trays

More info


AplusA-online.de - Source: National Institute of Occuaptional Safety and Health