GB/T 13870.1-2008 Effects of current on human beings and livestock—Part 1:General aspects

Scope

For a given current path through the human body, the danger to humans primarily depends on the value of the current and the duration of the electrical stimulation. However, in many cases, the time/current regions specified in the following provisions are not directly used in the design of electric shock protection. The allowable limit values of contact voltage (i.e., the product of the current passing through the human body and the human body resistance) as a function of time must be used as a criterion. Since the human body resistance changes with the contact voltage, the relationship between current and voltage is not linear, so it is necessary to provide data on this relationship. The resistive and capacitive components of the current presented by different parts of the human body, such as skin, blood, muscles, other tissues, and joints, constitute the human body resistance.
The value of human body resistance depends on several factors, particularly the current path, contact voltage, duration of current, frequency, skin wetness, contact surface area, applied pressure, and temperature.
The resistance values listed in this standard are primarily obtained by carefully reviewing the data measured on cadavers and a small number of living people.
The effects of AC current on the human body are primarily based on the research results of AC current with a frequency of 50 Hz or 60 Hz, which is the most commonly used frequency in electrical devices. However, the data provided is considered applicable to a frequency range of 15 Hz to 100 Hz. At the starting end of this range, the threshold value is higher than that at 50 Hz or 60 Hz. Mainly, this chapter primarily considers the risk of ventricular fibrillation, which is the main mechanism of fatal accidents.
In terms of the number of DC applications, the number of accidents involving DC is much smaller than expected. Only under very unfavorable circumstances, such as in mines, will fatal accidents oc

Development Information

Replace the following standards

Superseded by the following standards

Referenced Standards

Adopt standards

Related Standards