Heinrich's law, also known as Heinrich's safety law, Heinrich's accident law or Heinrich's law, is a 300∶29∶ 1 law proposed by Herbert William Heinrich, a famous American safety engineer.

Heinrich first put forward the theory of accident causal chain, which is used to clarify the various causes of casualties and their relationship with accidents. According to this theory, the casualty accident is not an isolated event, although the injury may happen suddenly at a certain moment, it is the result of a series of events.

Heinrich described the occurrence and development of industrial accidents as a series of events with a certain causal relationship, namely:

(1) Casualties are the result of accidents.

(2) The accident happened because of: people's unsafe behavior; The unsafe state of things.

(3) Unsafe behavior of people or unsafe state of things is caused by people's shortcomings.

(4) People's shortcomings are induced by bad environment or caused by congenital genetic factors.

Extended data:

The origin of Heinrich's law:

This rule was obtained by Heinrich of the United States after counting many disasters in 194 1. At that time, Heinrich counted 550,000 mechanical accidents, including 65,438 deaths and serious injuries, 48,334 minor injuries and the rest were harmless accidents.

From this, an important conclusion is drawn, that is, in mechanical accidents, the proportion of death, serious injury, minor injury and no injury accidents is 1: 29: 300, which is called the accident law internationally. This law shows that in the process of mechanical production, for every 330 accidents, 300 accidents did not cause personal injury, 29 accidents caused minor injuries, and 1 accident caused serious injury or death.

For different production processes and different types of accidents, the above proportional relationship may not be exactly the same, but this statistical law shows that in the same activity, countless accidents will inevitably lead to heavy casualties. To prevent the occurrence of major accidents, we must reduce and eliminate harmless accidents and pay attention to the signs and attempts of accidents, otherwise it will eventually lead to great disasters.

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