For outdoor installations, the most desirable cable tray system is a ladder cable tray or a ventilated trough cable tray without covers. If covers are used they should be the ventilated type. Cable tray wiring systems have a 30-year plus proven track record of safety and dependability.
Can tray cable be run exposed?
Despite widespread misinterpretation in the industry, standard tray-rated cable cannot run outside of the cable tray per the National Electrical Code (NEC) Sec. 336.10(7) from 2014. If a cable must run outside of a tray for any length, a tray cable rated for “exposed-run”(ER) must be used.
Why are cable tray covers used?
Without covers, it allows maximum free flow of air across the cables. This allows the heat produced in the cable's conductors to effectively dissipate. The rungs of the ladder cable tray provide convenient anchors for tying down the cables in the non-horizontal cable tray runs.Sep 21, 2020
Which of the following covers the installation requirements for cable tray?
NFPA 70 – The National Electrical Code covers the installation requirements for the safe application of cable tray systems including ladder, ventilated trough, ventilated channel, solid bottom and other similar structures.
What is the purpose of cable tray cover?
Ladder and ventilated trays may have solid covers to protect cables from falling objects, dust, and water. Tray covers for use outdoors or in dusty locations may have a peaked shape to shed debris including dust, ice or snow.
Why is it importance in installing cable tray?
A cable tray is an important element to add to any wire set up. By adding a cable tray, you're able to organise, support, and transport your cables efficiently. Most people may think their homework is done when they find the right professional to install a wiring system at their business.
Where is tray cable used?
These cables are most commonly used in power and control circuits and in tray applications where flame retardant properties are required. They can be installed in raceways, cable trays, and in outdoor applications.
What are the uses of a tray cover?
Tray Covers help maintain food temperatures and protect food from contamination and spills.
What is tray covers?
Tray covers protect the product they're covering from contaminants and debris, keeping product safe from outside conditions that may be unsanitary. ... Food tray covers fit over food pans and display trays, maintaining the food's temperature and freshness.
Space between cables must be equal to one cable diameter — 11 x 1.07 inches = 11.77 inches. Total cable tray width required is 12.84 inches + 11.77 inches = 24.61 inches. A 30 inch wide cable tray must be used.