Why should electric hand tools not be lifted by their service cords?

Lifting electric hand tools by their service cords is not recommended primarily because the cord might be pulled off its terminals. This action can cause damage to both the cord and the tool, leading to potential operating failures or hazardous situations. If the cord is yanked, it can disconnect from the tool or even cause internal damage, creating a safety risk for the user. Keeping the cord secure and undamaged is essential for maintaining the integrity and functionality of the tool, as well as ensuring safe operation.

The other options present potential concerns, such as tangling of the cord or weight issues, but they do not address the critical electrical safety matter as directly as the risk of pulling the cord from its terminals. Electrical fires can be a concern in broader contexts, yet lifting the tool by the cord mainly poses a risk to the connection and function of the tool itself.