Which type of stepladder should not be used near electrical power sources?

The reason aluminum stepladders should not be used near electrical power sources is that aluminum is a highly conductive metal. If an aluminum ladder comes into contact with live electrical wires or equipment, it can easily transfer electricity, posing a significant risk of electric shock or electrocution to the user.

In contrast, wood and fiberglass are non-conductive materials. Both types of ladders provide a safer option for use around electrical tasks; wood is an inherently non-conductive organic material, while fiberglass is specifically engineered as a non-conductor of electricity. Plastic ladders also fall into the non-conductive category, making them suitable for similar scenarios. Therefore, when it comes to safety around electrical sources, aluminum stepladders should be avoided to prevent potentially life-threatening electrical accidents.