What is the use of cross arm?

In order to support overhead electrical conductors (wires) above the ground and other objects, cross arms are employed in electrical power distribution and transmission systems.

The main purpose of cross arms is to sustain power lines by giving them a level, horizontal surface to rest on so they don't droop or collide with surrounding buildings. Cross arms not only offer support but also aid in evenly distributing the electrical load throughout the whole transmission line's span, preventing the cables from breaking or sagging from too much weight.

Insulation is yet another purpose for cross arms. Cross arms are commonly made of materials like fiberglass-reinforced polymers (FRP), which have electrical insulation qualities that keep electricity from escaping the arm and onto the ground, protecting humans and animals and reducing property damage.

In order to safeguard the system from threats like lightning damage, cross arms are also necessary for installing extra hardware parts like transformers, insulators, and lightning arrestors.

In conclusion, cross arms are mostly used in power distribution and transmission systems to provide electrical insulation, install extra hardware components, and provide a stable support for power lines. They also help disperse the electrical load equally. Electrical cross arms are an essential part of contemporary power grids because without them, wires would droop and present risks to safety and dependability.