Electric tools can be divided into three categories based on their safety standards and usage environment, each with different designs and functions to meet different work needs:

1. Classification criteria

Class I electric tools: mainly rely on basic insulation and include grounding protection, suitable for dry environments.

Class II electric tools: have double insulation or reinforced insulation, do not require grounding protection, and are suitable for humid environments.

Three types of electric tools (Class III): using safe ultra-low voltage power supply, combined with screen protection measures, providing anti electric shock performance, suitable for damp, narrow or enclosed spaces.

2. Key Differences

Power type:

Category 1: Use AC 220V or higher voltage, which may include AC and DC power sources of 36V or higher.

Category 2: Use a DC voltage of 24 volts or lower, such as 12 volts.

Category 3: Use safe ultra-low voltage power supply, such as DC 12V.

Anti electric shock protection:

One type: relying on grounding wires to prevent electric shock.

Category 2: Provides double insulation or reinforced insulation without the need for a grounding wire.

Category 3: Provide anti electric shock protection through safe ultra-low voltage power supply and screen protection measures.