Cable Tray and Electrical Conduit

Cable tray

In the electrical wiring of buildings, a cable tray cables used for power distribution and communication. Cable trays are used as an alternative to open wiring or electrical conduit
system is used to support insulated electric systems. Cable trays are commonly used for cable management in commercial and industrial construction. Cable trays are especially useful where changes to a wiring system are anticipated, since new cables can be installed by laying them in the tray, instead of pulling them through a pipe. material use are steel, stainless steel, aluminum, or glass-fiber reinforced plastic 

Electrical Conduit

An electrical conduit is an electrical piping system used for protection and routing of electrical wiring. Electrical conduit may be made of metal, plastic, fiber, or fired clay. Flexible conduit is available for special purposes.

Conduit is generally installed by electricians at the site of installation of electrical equipment. Its use, form, and installation details are often specified by wiring regulations, such as the U.S. NEC or other national or local code. The term "conduit" is commonly used by electricians to describe any system that contains electrical conductors, but the term has a more restrictive definition when used in wiring regulations.
Early electric lighting installations made use of existing gas pipe to gas light fixtures (converted to electric lamps). Since this technique provided very good protection for interior wiring, it was extended to all types of interior wiring and by the early 20th century purpose-built couplings and fittings were manufactured for electrical use.