For installing a service arrester at an exterior entrance, which type of ladder is preferable?

When installing a service arrester at an exterior entrance, using a wood or fiberglass extension type ladder is preferable for several important reasons. Both wood and fiberglass ladders are non-conductive materials, which provides a crucial safety advantage when working near electrical installations or equipment. This non-conductivity reduces the risk of electrical shock should the ladder come into contact with live wires or other energized components.

Additionally, extension ladders made of these materials tend to be more sturdy and stable, which is essential when working at height. The design of an extension ladder allows for greater versatility and reach, facilitating access to higher locations such as the eaves of a roof or the top of a doorway where a service arrester may need to be installed.

In contrast, an aluminum extension ladder, while lightweight and easy to maneuver, poses a significant safety hazard due to its conductivity. This risks an electrical shock when working around high-voltage areas. The step ladder, while useful for tasks that do not require much height, is not suitable for accessing elevated service points. A telescoping ladder may be portable and compact but often lacks the stability and strength needed for lasting access in exterior applications. Thus, a wood or fiberglass extension type ladder is the most suitable choice for ensuring safety and