Support-type hard busbar fittings can be classified into three main categories based on their functions: support fittings, equipment fittings, and conductor fittings.

1. Support Fittings

Support fittings are further divided into fixed fittings and expansion fittings. Their key characteristics include:

Fixed Fittings:

Designed to secure the hard busbar while allowing for thermal expansion and contraction.

Do not conduct electricity.

Must withstand certain vertical and horizontal forces.

The force experienced by fixed fittings depends on the weight per unit length of the busbar, its span, and short-circuit forces.

Expansion Fittings:

Serve as expansion joints, preventing stress due to temperature changes that could lead to insulation failure.

Must provide sufficient expansion capacity, which is determined by the length of the busbar and the expected temperature variation.

Besides mechanical stress, expansion fittings must also conduct electricity, with current-carrying capacity matching that of the busbar.

2. Equipment Fittings and Conductor Clamps

Equipment Fittings: 

Used to connect hard busbars (such as aluminum-manganese alloy tubes) to equipment terminals.

The structure of equipment fittings is specifically designed to accommodate the connection between the busbar and various electrical devices.

These fittings play a crucial role in ensuring the reliability and efficiency of electrical connections in power distribution systems. Proper selection and installation of these fittings are essential for maintaining system integrity under various operational conditions.