If the outer casing is not grounded: the welder casing will have voltage when the welder is damaged. If someone touches the welder casing, the human body and the ground and the power neutral point work ground wire (three-phase four-wire system neutral point) Generally grounded to form a loop, as indicated by the dotted line in the figure above, the current will cause an electric shock through the human body.

Grounding of the outer casing: insulation damage of the welder When the outer casing of the welder is energized, the outer casing of the welder is directly connected to the earth through the grounding wire of the outer casing to form a short circuit (the dotted line without an arrow in the above figure). This short-circuit current will protect the power supply. (Automatic switch, fuse or fuse) action to disconnect the power of the welder. Before the power is cut off, even if someone touches the outer casing of the welder, since the resistance of the grounding wire of the outer casing is almost zero, almost no current flows through the human body, which can also protect personal safety.

1. When entering metal containers, underground, trenches, etc., it is strictly forbidden to bring the electric welding machine and the lighting transformer for lighting to prevent electric shock caused by one voltage.

2. During the operation, especially when replacing the welding rod, the welding insulated gloves must be worn as required.

3. Wear insulated shoes or stand on dry wooden boards when working in a humid environment. Work clothes, work shoes, and gloves should be kept dry to ensure that the insulation performance is not reduced.

4. When removing the power cord, eliminating the fault of the welder, moving the welder and the welder away from the site, remember to disconnect the power switch.

5. When the lighting of the welding operation site is insufficient, the running light should be used. It is forbidden to use 220V lighting. The voltage of the running light used in humid environment or metal container should not exceed 12V.

6, rain and snow days must be in the outdoor open-air welding operations, must take measures to prevent rain and snow (such as rain canopy, etc.), to prevent rainwater wet welding machine, wires and welding rods, resulting in electric leakage and injury.

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