Which of the following tools is considered double insulated?

Double insulation refers to a specific safety measure in electrical tools designed to protect users from electric shock. Tools with double insulation have an additional layer of insulation beyond the basic one required to ensure safety. This typically means that the tool is designed without the need for a grounding wire, which is a key characteristic of double-insulated tools.

In this context, tools that are marked as double insulated, as indicated by a specific symbol (often two square shapes one inside the other), meet the criteria for this safety classification. They are constructed with two layers of insulation between the user and the electrical components, creating a safer environment during use, especially in situations where the user may be in contact with conductive materials or wet conditions.

The options regarding plugs—both three-prong and single-prong—do not inherently indicate double insulation. While a three-prong plug includes a grounding system for additional safety, it doesn’t classify the tool as double insulated. Similarly, a single-prong plug lacks grounding and does not provide any assurance about insulation standards.

The last option, suggesting all tools, is too broad, as not all tools are equipped with double insulation features; many may simply comply with standard insulation requirements.

Thus, identifying tools with a double-insulation marking is crucial