Please enter keywords to search

Global |EN

Choose your country & Language

Asia Pacific

Australia & New Zealand
India
Indonesia
Korea
Malaysia
Philippines
Singapore
Singapore (Sunlight)
Vietnam

Middle East & Africa

CHINT-EGEMAC
Saudi Arabia
South Africa
UAE
CHINT AJLAN

Europe

France
Italy
Spain
Turkey
Kazakhstan
Netherlands

North America

Mexico

Latin America

Brazil
Peru
Ecuador

Choose your country & Language

Australia & New Zealand
India
Indonesia
Korea
Malaysia
Philippines
Singapore
Singapore (Sunlight)
Vietnam
CHINT-EGEMAC
Saudi Arabia
South Africa
UAE
CHINT AJLAN
France
Italy
Spain
Turkey
Kazakhstan
Netherlands
Mexico
Brazil
Peru
Ecuador

Please enter keywords to search

Your search term contains restricted words. Please use different keywords.

What Is Busway and Busway Exposure?

AUG 19, 2021

busway-and-busway-exposure-20210819
busway-and-busway-exposure-20210819
busway-and-busway-exposure-20210819

Table of Contents

  1. What Is Busway and Busway Exposure? 
  2. Types of Busway (Bus Ducts) 
  3. Busway Used in A Distribution System 
  4. Busway Components 
  5. Summary

Industrial and commercial distribution systems use several methods to transport electrical energy. The most common examples of these methods include heavy conductors running in trays or conduits. Cable and conduit are often inflexible once installed. However, a more flexible and preferred option is to use a busway, also known as bus ducts, which are essentially bus bars in busway exposure.

Below is everything you need to know about busway and busway exposure, including the different busway components.

What Is Busway and Busway Exposure?

According to the National Electrical Manufacturer Association (NEMA) , busway is a prefabricated electrical distribution system that consists of bus bars in a protective enclosure (busway enclosure), including straight lengths, devices, fittings, and accessories.

This system transports electricity and connects to electrical gear like panelboards, switchgear, and transformers. A busway enclosure comprises bus bars, a housing, and support and/or insulating material.

Busway and cable and conduit are often compared for several reasons. However, they both provide the same function, which is to deliver power between electrical equipment. The major difference is that busway uses less material since each piece is designed for a specific job and comes with a small cross-sectional area.

In addition, it has a lower voltage drop compared to cable and conduit because of the solid phase bars. This results in lower impedance. Moreover, the installation of busway is typically less labor-intensive than the installation of cable and conduit.

Types of Busway (Bus Ducts)

The main types of bust ducts include:

Non-segregated Busway

These bus ducts have copper phase bars situated in an enclosure separated by air and epoxy insulation. The enclosure or housing materials tend to vary from steel, aluminum, and stainless steel. Its environmental ratings include outdoor, indoor, and dust tight. Non-segregated phase busway can provide both medium and low voltage solutions and is well suited for harsh environments.

A non-segregated busway is used in applications up to 38kV and 6000A. You will find it mostly in electrical utilities, heavy industry, and petrochemical sites.

Sandwich-Style Busway

These bus ducts have phase bars stacked together inside a non-ventilated steel or aluminum enclosure. You can use a sandwich-style busway to deliver power between gear with feeder pieces.

A plug-in busway, which is typically a busway with tap-off locations placed on it, is used to power equipment below the busway. Generally, a sandwich-style busway is a cost-efficient solution in different sectors since it can provide high ampacity with high short-circuit withstand ratings.

It is utilized in applications up to 600V and up to 5000A. Common applications for a sandwich-style busway include data centers, commercial construction, and general heavy industry.

Track Busway

The bus duct is a continuous rail design where tap-off boxes can be removed or installed almost anywhere along the bus ducts system. These boxes have fixed receptacles and cord whips that allow for distributing power to equipment under the busway.

It is mostly found in data center markets but is also practical in labs and warehouse applications. It is available up to 1000A and 600V and is rated for indoor use.

Air-Insulated Busway

These bus ducts feature either aluminum or copper phase bars held in place with polymer support in an aluminum enclosure. It has plastic clips that keep the conductors isolated and spaced, guaranteeing air circulation.

The air-insulated bust ducts are indoor rated and feature plug-in as well as feeder designs. The air-insulated busway can provide medium ampacity and low voltage solutions with robust safety ratings. In addition, it is available up to 600A and 600V. It is commonly used in labs, machine shops, and data centers.

Busway Used in A Distribution System

Busway, also referred to as bus ducts, functions just like cable and conduit assemblies. One of busway’s major pros is how easily its sections are linked together. Connecting standard busway lengths can supply electrical power to any area of a building. Generally, installing or changing a busway system takes much less time than cable and conduit systems. However, in some instances, a complete distribution system comprises a combination of busway and cable and conduit.

Busway commonly has varying applications. You can find it in industrial installations and high-rise buildings. It is mostly used in industrial locations where they supply power to heavy equipment, air conditioning, and lighting.

Expect to find bus ducts in industrial facilities, electrical utilities, petrochemical utilities, large residential complexes, data centers, and mission-critical facilities.

busway-used-in-distribution-system-20210819
busway-used-in-distribution-system-20210819
busway-used-in-distribution-system-20210819

Busway Components

Busway comprises several components. These include:

Bus bars

These are essentially conductors that conduct electricity. Bus bars vary in size and are made from copper or aluminum. A bus bar is represented schematically by a straight line with several connections made to it. Bus bars are generally uninsulated and feature adequate stiffness to be supported in the air by insulated pillars.

Housing

The busway enclosure is designed to contain the bus bars. It is made from steel or aluminum.

Insulating system

The system separates the bus bars from each other to hinder electrical faults. The insulating system is made of a combination of epoxy, air, and mylar.

Fittings

These include offsets, elbows, and tees that assist in properly routing bus ducts from one electrical connection or termination.

Summary

In a nutshell, bus ducts are prefabricated distribution systems consisting of bus bars in busway enclosures. There are different types of busway, including non-segregated busway, track busway, air-insulated busway, and sandwich-style busway. The different components of busway include bus bars, fittings, housing, and insulated systems.

One of the most common examples is the HV&LV Busway from CHINT. CHINT is a global manufacturer and supplier of high-quality electrical components, devices, and accessories used in residential, commercial, and industrial applications. Consult an expert electrician to advise you further on busway examples and applications.

The Latest
JULY 2, 2025 A Guide to the CHINT SMG Open Protocol Gateway: Building Flexible IoT Solutions

Discover how CHINT’s SMG-WSR/SMG-ESR Gateway and NB2 Circuit Breakers create smart, efficient, and remote-controlled electrical systems for various industries.

JULY 1, 2025 An Introduction to Power Circuit Breakers: How Do They Protect Your Industrial and Commercial Facilities?

Explore CHINT’s power circuit breaker solutions for high-performance electrical protection in industrial, commercial, and healthcare environments.

JULY 1, 2025 Understanding the VFD Working Principle in Industrial Automation

Learn the working principle of VFDs and discover how CHINT NVF7 boosts performance, energy savings, and equipment longevity in industrial automation.

JUNE 30, 2025 Gas Insulated Switchgear in Renewable Energy Integration

Learn how CHINT’s gas-insulated switchgear ensures stable, safe, and compact power distribution in renewable energy projects like wind and solar farms.

JUNE 30, 2025 Factors that Influence Commercial HVAC System Cost

Learn the major factors that impact commercial HVAC system pricing, from system types and tonnage to installation conditions and energy efficiency.

JUNE 27, 2025 Applications of Power Transformers in Solar Energy Systems

Discover how CHINT Global's power transformers enhance solar energy systems through efficient voltage regulation and grid integration for homes, businesses, and utility-scale projects.

JUNE 27, 2025 How to Wire a Low-Voltage Transformer

Discover essential safety precautions, wiring methods, and troubleshooting tips for low-voltage transformer setup. A complete guide for technicians and engineers.

JUNE 27, 2025 Water Pump Drives: PTO vs. Battery vs. Solar

Explore key benefits and drawbacks of PTO, battery-powered, and solar-powered water pump systems. Choose the right drive for your specific use case.

JUNE 26, 2025 How to Install a Changeover Switch for a Generator?

Discover how to install a manual changeover switch for your generator. Ensure safe and reliable power transfer with CHINT's expert tips and tools.

JUNE 25, 2025 RCBO Breakers Explained: How They Work, Wiring Diagrams, and Testing Tips

Discover how RCBO breakers protect against overloads and Earth leakages. Learn about wiring diagrams, differences from MCBs, and testing tips for safe operations.