How to Use Copper Busbar in Electrical Power Distribution

A copper busbar is a conductor used in electrical power distribution. It is a vital component for the smooth and efficient operation of a wide range of equipment, including motors, generators, pumps, transformers, lighting, alarms, control panels, and other industrial applications.

There are many types of copper busbars, with each having specific characteristics and benefits for a particular application. Regardless of the material, it should be made from a conductive metal that has low electrical resistance and high mechanical strength. It should also be able to withstand a certain degree of heat and humidity, and it should not have an oxidized layer on the surface that is non-conductive.

The best conductive metal for a bus bar is copper. It has a low resistance, high mechanical strength, and low fatigue failure. The surface of the copper should be tinned for corrosion resistance and solderability.

A lot of people like the look and feel of copper, so it is a popular choice for bus bars. However, it does not offer the same electrical conductivity as aluminum.

You will want to make sure you are using copper with a conductivity of at least 99% IACS (International Association of Copper Solders). The conductivity can be improved by tin plating, which is a simple immersion process that deposits pure tin onto the surface of the bus bar.

In addition, the tin can be plated with other substances to improve corrosion and chemical resistance, as well as electrical conductivity. You can also opt for a powder coating, but this is likely to reduce the electrical conductivity of the copper.

Jointing

Busbars are most commonly joined together by bolting them together, although they can also be welded or soldered. For long service life and reliability, it is important to use the correct-sized bolts for the job. This should be done in a controlled way to prevent over-tightening and overheating.

Choosing the Right Fastener

Stainless fasteners, specifically self-clinching fasteners, are your best option when making custom busbars. These fasteners are more tolerant of the rigors of installation and the softness of the bus bar alloy, so they are better suited to long-term reliability.

Tin Plating

Copper busbars are usually tinned to increase their corrosion resistance, conductivity, and solderability. This is a simple immersion process that deposits pure copper tin onto the bus bar's surface.

If you need additional corrosion and chemical resistance, a thin layer of nickel can be applied to the bus bar before it is tinned. This can be a good option for certain applications, but you should always consult with a plating specialist to ensure the right amount of nickel is added.

You can also tin the entire bus bar, but this can be very expensive, and you may need to wait for a longer lead time to get the desired results.

Adding More Circuits to Busbar Terminals

Having more connections per terminal can help you comply with local regulations and limit how much you have to purchase for your boat or trailer. It can also allow you to install plug-in outlets instead of utilizing the traditional terminal studs.