A busduct is a metal device, which supports and contains a group of busbars. The device is used for efficient and effective supply of electric power in a variety of industrial locations. The metal raceway can add and remove a branch circuit without removing voltage completely from the duct. The conductor of a bus duct is made of either Copper or Aluminum. They are insulated and completely enclosed to prevent mechanical damage and dust accumulation. A busduct in USA comes in a standard length of 10 foot.Bus ducts offered by reliable manufacturers are known for their simplicity and safety. They are built to last longer. These metal devices are designed to withstand tough handling during installation. They are suitable for high rise buildings. http://amplify.com/u/a1c9j0