Are Lightning Arresters the Same as Surge Arresters?

When talking about arresters, even professionals can use various terms interchangeably, which can lead to confusion. Although different arresters can fulfill the same purpose, in some cases, specific differences are worth noting.

If you want to know if your home needs a lightning arrester or a surge arrester, it would be best to learn what each system does. Here's all you need to know about the difference between both types of arresters.

Lightning arresters

As the name suggests, lightning arresters protect circuits from surges produced by lightning. These surges can have extremely high voltage and can potentially cause severe damage to electrical installations.

Protection against lightning strikes is already present in the form of ground wires. However, there's still a possibility that this earthing doesn't prevent the current from reaching terminals. This possibility makes lightning arresters a necessity, especially in areas more prone to lightning storms.

Lightning arresters can be placed on the highest points of towers, transmission poles, buildings, and similar structures.

Surge arresters

Surge arresters are devices that limit the voltage and current surges. Their purpose is to protect communication lines, insulation, and appliances from various surge types. Besides lightning, the harmful transient voltage can come from different electrical faults.

Usually, surge arresters consist of a silicone or porcelain housing that holds a non-linear resistor made of metal oxide. They're installed in the equipment panels, providing direct protection to both high and low-voltage machinery.

Unlike lightning arresters which divert surges directly to the ground, surge arresters send the energy excess to ground wires.

The distinction between lightning arresters and surge arresters

The origins of surge arresters reveal why they're often mistaken for lightning arresters. When the devices first came into use, power systems were less complex in design. Because of that, lightning was the primary source of voltage surges, earning the early devices the name of 'lightning arresters.'

The term remained in use even after more specialized devices for protection against lightning became widespread. The crucial difference between the two device types lies in specialization.

Surge arresters effectively redirect charges from various sources, including lightning, and serve as lightning arresters. On the other hand, lightning arresters aren't suitable to fulfill the role of surge arresters due to their specialized nature.

Other types of arresters

Besides lightning and surge arresters, two other devices have a similar purpose and often share the same names in general use.

Lightning rods are made of conductive materials like metals and present a cheaper alternative to other arresters.

Surge suppressors are used indoors in distribution boards. They protect installations from sudden electrical spikes.

Get expert help to install the proper arresters

Professional electrical services will know exactly which type of arrester is suitable for your building's layout. That's why consulting with an experienced electrical company is advisable before installing any protection.

When you need a licensed electrician for commercial or residential electrical needs, call Zimmerman Electric at 310-378-1323.