Which of the following is a requirement for a tool used in electrical work?

A key requirement for tools used in electrical work is that they must be insulated. Insulation on tools helps to protect the user from electric shock by preventing electrical current from passing through the tool and into the user. This is especially crucial when working with live circuits or in environments where there's a risk of accidental contact with energized components. Insulated tools are tested to specific voltage levels to ensure they provide adequate protection, which is critical for safety in electrical work.

While lightweight tools can be advantageous for maneuverability and ease of use, they are not a mandatory specification for safety. Color coding can help in identifying tools and preventing mix-ups, but it does not play a role in the essential safety functions of electric work tools. Powering tools is often a matter of convenience and not a requirement for all tasks, as manual tools can also be effective. Hence, insulation is the most crucial characteristic for ensuring safety in electrical applications.