All Things Bus Duct: The Basics of Electrical Power Distribution

Electricians are no doubt familiar with bus duct and its uses. The average layperson, however, may come across terms like busbar or busway and need an introductory course. Read on to learn about this important sector of electrical distribution.

Bus Duct Factory

Current Midwest maintains an inventory of new, used, and reconditioned bus duct and plugs manufactured by Square D, ITE, Bulldog, GE, Cutler-Hammer, Siemens and other top brands.

Our used Bus Duct and Bus Plugs are thoroughly reconditioned and come with a three-year warranty.

Contact Current Midwest
at (800) 391-0109

Bus Duct Basics

A key part of electrical power distribution is bus duct. Also called busway, bus duct provides an alternative means of conducting electricity. Bus duct is used in commercial and industrial settings to conduct electricity to power cables or cable bus. Structurally, a bus duct is a sheet metal duct containing either aluminum or copper busbars (metallic strips or bars that conduct a substantial electrical current) in a grounded metal enclosure. Bus duct is easy to maintain and flexible, helping to accommodate changing load requirements.

According to Electrical Construction & Maintenance Magazine, an online resource for the electrical design and maintenance industry, busway was first introduced in 1932 for use in the automotive industry. Since then this product has grown and now serves many other industries.

When to Install Bus Duct

Bus duct can be installed in most applications where cable or conduit would normally be used. Many people believe bus duct only serves high-amperage applications. This is a misconception–busway can provide a high degree of efficiency for both low- and high-amperage situations. Bus duct systems are manufactured ranging from 100A to 6500A. Some low-amperage applications could be high-tech companies, like computer manufacturers. High-amperage busway systems are required by heavy assembly industries like automotive.

Busway is also versatile. Thanks to developments like elbows and offsets, bus duct offers a lot of layout flexibility, like adapting to directional changes. Tap-off units or new sections can easily help meet load changes. There are some cases, however, where cable and conduit are the appropriate option. For example, bus duct cannot be installed where it’s subject to corrosive vapors.

Working with the Manufacturer

When ordering bus duct for a specific application, it’s imperative that you plan ahead. EC&M recommends paying particular attention to dimensions. Note any bends, columns, floor elevation changes or other route information. Develop sketches of the route the bus duct must follow. The manufacturer can use this information to develop final layout drawings. For any uncomplicated installations, standard bus duct can be ordered from the inventory stock.

Top-quality electrical gear is incredibly important for the safety of both the electricians installing it and the personnel working in the building where it’s used. Current Midwest has a large inventory of bus duct and plugs, both current and obsolete models, as well as reconditioned used products. We supply products manufactured by Square D, ITE, Bulldog, GE, Cutler-Hammer and Siemens. Any used bus duct or plug we offer has been thoroughly reconditioned by our highly-trained staff; all of our reconditioned equipment comes with a three-year warranty.

To learn more about Current Midwest’s expansive inventory of bus duct products, contact us at (800) 391-0109 or email Scott at

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