Power strip burnout incident

The main sequence of events leading to the accident:

Two welders, A and B, were performing spot welding on a metal casing at a factory. They discovered that a section of the welding machine's lead wire was broken. Welder A then found a piece of flexible wire and asked welder B to replace it. While replacing the wire, welder B noticed that a bolt on the primary winding terminal board was loose, so he tightened it with a wrench. Welder A was not present at this time. After testing the welding machine a few times, welder B left the work area. When welder A returned, unaware of the situation, he started spot welding. After only one weld, he cried out and collapsed to the ground. Worker C immediately switched off the power, but unfortunately, due to the delay in rescue efforts, welder A died.

Main causes of the accident:

(1) Short circuit caused by the burnt terminal board, resulting in contact between the coil and the welding machine casing.

(2) The welding machine casing was not grounded.

How to prevent similar accidents?

(1) Equipment maintenance should be performed by qualified electricians.

(2) Welding equipment should be properly grounded.