What is the difference between primary training and retraining of electrical work?

Yes, there are two kinds of certificates for electricians and welders, namely, special operation certificate (post certificate) and professional qualification certificate (grade certificate), which are issued by the safety production supervision and management department and the labor and social security department respectively. They were issued by two different departments, and they must be held in accordance with the regulations to ask the Labor Bureau and the Safety Supervision Bureau.

Electricians should know electrician knowledge, direct and indirect contact electric shock protection, special protection of electrical safety, power transformation and distribution equipment, relay protection device, DC system and safety management.

Extended data

The harm of current to human body can be divided into two categories: electric shock and electric injury.

Electric shock. Electric shock is commonly referred to as electric shock, and most electric shock deaths are caused by electric shock. When the human body comes into contact with a charged conductor, the metal shell of a leakage device, or is too close to high-voltage electricity, or is struck by lightning, discharged by a capacitor, etc. , can cause electric shock. Electric shock is harmful to human organs, such as killing people by destroying their heart, lungs and nervous system.

Electric injury. Electrical injury refers to the damage caused to human body by the thermal effect, chemical effect and electrical stimulation of electric current when getting an electric shock. Electric injuries are more common outside muscles and often leave scars on the body that are difficult to heal. Common electrical injuries include electrical burns (arc burns), electrical burns and skin metallization.

Reference source: Baidu Encyclopedia-Electrical Work