Introduction

There are many components inside an electrical panel that help distribute electricity safely and efficiently. Circuit breakers, switches, and protection devices will help manage various aspects of the electrical system. But how do you get electricity into multiple circuits?

Busbars!

Power Panel Busbars allow a common connection point to distribute electricity to various outgoing circuits. They are commonly found in industrial panels, switchgear, distribution boards, and other electrical installations.

The type of material, size, and layout of the busbars will directly impact the performance of your panel. Here we will look at how electrical busbars work, what types of options are available, and what factors to consider when choosing a busbar.

What Are Power Panel Busbars?

Busbars are metal conductors used in electrical panels to carry power from an incoming to multiple outgoing circuits.

They are usually made from copper or aluminum due to their high conductivity.

They can be flat, rectangular, shaped, or insulated depending on the application.

They can be used to supply 3-phase power to different sections of a distribution panel; they can have separate bus bars for each phase (R, Y & B) plus neutral and earth if required.

In short, it is just a point of distribution.

How Does a Busbar Work in an Electrical Panel?

The theory behind busbars is fairly simple. It takes the incoming power and feeds it into the main busbar. There will be a switching and protection device of the correct rating to get the power to the main busbar. It then distributes power to multiple outgoing circuits.

1. The power comes into the panel on the main incoming.

2. The incoming supply is connected to the main busbar.

3. The power is then distributed to the multiple outgoing circuits with suitable connections and protection.

4. Circuit breakers help provide isolation to individual circuits.

5. The power is then supplied to the connected equipment via the outgoing feeders.

This provides a structured way of distributing the power and minimizes the number of connections within the panel.

Types of Busbars in Electrical Panels

There are many different types of busbars used within electrical systems. These can be split into

1. Copper Busbars

Copper busbars are very commonly used within electrical distribution due to their high conductivity and great mechanical properties.

Typical applications include:

Industrial Electrical Panels Switchgear Assemblies and Main Distribution Boards Motor Control Centres High Current Connections

As the conductivity of copper is higher than aluminum, less space may be needed (smaller cross section).

2. Aluminum Busbars

Aluminum busbars are also a popular option and can be used where a lighter component is wanted.

Benefits include:

Lightweight Good Electrical Conductivity Cost-effective material can be used in many power distribution applications.

Design care must be taken to minimize oxidation and contact resistance at joints.

3. Flat/Rectangular Busbars

This is one of the most common busbar types used. The rectangular shape makes them easy to mount and has bolted connections. This provides a clean setup.

They can be manufactured to your specifications. Width, Thickness, Length, Hole Positions, and Bends.

4. Flexible Busbars

Flexible busbars are used when there is some movement or vibration required.

Often used to connect components together.

5. Insulated Busbars

Insulated busbars have an insulating covering. They can be used where more protection or specific insulation is needed.

Ensure you use the correct insulation for the application.

6. Phase, Neutral & Earth Busbars

Busbars can also be split into their function.

• Phase Busbars—Used to carry phase conductors in AC systems.

• Neutral Busbars—Used to provide common connections to neutral conductors. 

• Earth Busbars—Provide termination points to protective earthing conductors.

Each busbar will have a different application and should be installed according to the design.

Where are electrical busbars used?

• Industrial electrical panels: To supply electrical power to machines, motors, and production equipment.

• Power distribution boards: To provide multiple circuit outputs.

• Switchgear assemblies: To connect input and output sections of electrical circuits.

• Motor control centers: To supply electrical power to multiple motor feeders.

• UPS/inverters: Used internally to connect within power conversion units.

• Renewable energy systems: Used on appropriate solar, battery energy storage, and power distribution equipment.

Advantages of using busbars in power panels

There are many advantages of using busbars within power panels.

• Centralized distribution: Can provide a centralized point of distribution.

• Space saving: Saves space as there are fewer cables in the system.

• High current: Can be designed to cope with high electrical loads, provided the correct size is chosen and verified.

• Easy to maintain: With good access, they can be easily inspected and connections checked.

• Versatile: Can be provided in a variety of materials, sizes, and configurations.

• Reliable connections: If designed and installed correctly, they will provide reliable connections.

Performance will depend on sizing, installation, joints, and conditions.

Busbars & Cables – Which Is Better for Electrical Panels?

Busbars and cables both carry electrical current, but they’re designed for different installation requirements.

Busbars can be used in situations where:

• Multiple circuits require power from the same source.

• A neat and tidy panel layout is required.

• Connections can be fixed.

• High current distribution is required with a proper conductor design.

Cables can be used if:

• The connections need to be flexible.

• Equipment is mounted in different locations.

• Conductors need to go through cable trays, conduits, or enclosed areas.

• Flexibility is required.

Depending on the application, there may be no better solution; many electrical systems will contain a combination of both busbars and cables to ensure an efficient power distribution system.

Choosing the Correct Busbar for Your Electrical Panel

When choosing a busbar, there are a number of factors to consider. These include:

• Current—What current will it need to carry?

• Material—Copper or Aluminum? Consider conductivity, weight, cost, and application.

• Size—Width, Thickness & Length. Choose size to fit your electrical and thermal requirements.

• Panel Space—Ensure there is enough space, correct mounting, and electrical clearance.

• Holes, Bolts & Contacts—Ensure holes are in the right place, bolts are the correct size, and contacts are suitable.

• Surface—Tin plated, nickel plated, or insulated as required.

• Quality—Ensure measurements are accurate, edges are finished, bends are correct, and holes are in the right place.

Always use an approved technical drawing for bespoke requirements.

Common Busbar Selection and Installation Mistakes

Some common mistakes can affect electrical performance and connection reliability:

• Incorrect sizing of busbars based on current requirements.

• Failure to take into account temperature rise.

• Incorrect materials.

• Failure to take into account electrical clearance.

• Failure to take into account connection quality and tightening.

• Failure to check hole location and sizing against approved drawings.

Correct design & construction & installation is key to busbar reliability.

FAQs

1. What is the main purpose of a busbar within an electrical panel?

The main purpose is to distribute electrical power from one common input to multiple outputs.

2. Is it better to use copper or aluminum busbars within an electrical panel?

Copper has high levels of electrical conductivity; however, aluminum is lighter and could offer savings on material costs. It will depend on the requirements for your application.

3. What are the most common types of electrical busbar?

Copper, aluminum, flat, rectangular, flexible & insulated busbars. Phase, neutral & earth busbars.

4. Why would you use busbars rather than multiple cables?

They can create a neater, more compact layout for distributing electrical power.

5. Can busbars be made to your drawings?

Yes, they can. We can manufacture copper and aluminum busbars to your required size, thickness, hole location, bend, and finish.

6. Why would busbars get hot?

Common reasons for busbars getting hot can include poor connections, poor contact faces, high currents, poor ventilation, and incorrect sizing.

Selecting the right busbar manufacturer

Busbars in power panels are an essential component of electrical distribution. Choosing the right materials, sizes, and connections and ensuring a high-quality product will be essential for optimal performance.

Customized busbars can be manufactured to ensure electrical panel manufacturers and industrial equipment manufacturers have the right product.

We have manufactured customised copper and aluminium busbars since 1994 to your drawings and technical specifications.

We offer a range of services, including punching, bending, drilling, tapping, chamfering, deburring, and surface finishing.

If you’re looking for customized busbars for your electrical panels, switchgear, or power distribution systems, we can manufacture them to your technical drawing and requirements.

Get in touch with Adinath Enterprises to discuss your busbar manufacturing needs.