Types of Low Voltage Busway
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The two types of low voltage (LV) busway are feeder and plug-in. They are commonly intermixed on runs of busway and plug into each other.
plug-in Busway
Feeder Busway
feeder Busway
• Sometimes called low impedance busway
• Used to feed power to a distant point
• Beneficial because the voltage drop over the run is generally low (somewhat lower than plug-in and certainly lower than cable in conduit)
• Similar to an extension cord
• Indoor – connected to the facility distribution equipment and distributes power throughout the building
• Outdoor – connects from the transformer located outside the facility to the wall flange and must extend 1-foot inside the facility, then it can be connected via indoor feeder to the distribution equipment
Plug-In Busway
plug-in Busway
• Tap off of plug-in busway to feed devices
• Has plug in opening to plug in a bus plug
• More costly than feeder busway
• Similar to a power strip plugged into an extension cord
• Provides outlets every two feet for plug-in devices
• Indoor plug-in – connects to indoor feeder busway in order to “tap-off” electricity
• Sprinkler-proof plug-in – same as indoor plug-in, except it is sprinkler-proof
Length of Busway
• The most common length of busway is 10 feet.
• Ten-foot sections are used whenever possible to run power to a location.
• However, smaller lengths are available to meet the customer’s specific installation requirements.

Fittings
• Just as electrical fittings are used to turn corners, make tee connections and crosses in conduit and wire installations, special Busway Fittings (elbows, tees, and crosses), are available.
• These fittings provide the flexibility to route the bus to distribute electricity to any location in a building.
• Fittings are also used to terminate the busway.
• Some examples of termination fittings are end cable tap boxes, end closers, flanges to connect to switchboards or motor control centers, and transformer connections.
• Most fittings can be used on all types of busway. This adds flexibility should the customer need to reconfigure the bus run in the future

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