What do the class construction codes 1, 2, and 3 on my DEWALT tool represent?

The class construction refers to the motor construction and are represented as follows:

Class 1 Construction: The DEWALT Tool is grounded but not double insulated.

Class 2 Construction: The DEWALT Tool is double insulated.

Class 3 Construction: The DEWALT Tool is grounded and double insulated.

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