What material is commonly used for housing a lightning arrestor?

Polymer is commonly used for housing lightning arrestors due to its advantageous properties. Polymers provide excellent electrical insulation, which is crucial for handling high voltages and protecting the internal components of the lightning arrestor. Additionally, polymer materials are lightweight, resistant to corrosion, and can withstand a wide range of environmental conditions, making them suitable for outdoor applications where lightning arrestors are typically installed. The durability of polymers also means they can maintain their protective qualities over time, ensuring reliable performance in safeguarding electrical systems from voltage surges caused by lightning strikes.

In contrast, metals, while conductive, do not provide insulation and are therefore unsuitable for the housing material of lightning arrestors. Glass, although it offers good insulation properties, is heavier and more fragile, making it less desirable for outdoor applications. Wood, while it can be an insulator, is less reliable due to its susceptibility to environmental degradation and moisture absorption, which can significantly diminish its insulating properties over time. Consequently, polymer's unique combination of insulation, durability, and resilience makes it the preferred choice for lightning arrestor housings.