Types of protection against electric shock. Occupational Safety and Health

OCCUPATIONAL SAFETY AND HEALTH
Free library / Occupational Safety and Health

Types of protection against electric shock. Occupational Safety and Health

Occupational Safety and Health

Occupational Safety and Health / Legislative basis for labor protection

A modern electrical safety system should provide protecting a person from electric shock in the two most probable and dangerous cases:

with direct touch to live parts of electrical equipment under voltage;
with indirect contact.

Indirect contact is understood as a person touching the exposed conductive parts of the equipment, on which there is no electric potential in the normal mode (in good condition) of the electrical installation, but in case of any malfunctions that caused insulation failure or its breakdown to the case, these parts may cause a life-threatening human electrical potential.

Open conductive part (HRC) - a conductive part of an electrical installation that is accessible to the touch, normally not energized, but which can become energized if the main insulation is damaged.

Third-party conductive part (HRC) - a conductive part that is not part of an electrical installation (metal structures of a building, metal pipes for water supply, gas supply, heating, etc.)

The basic rule of electrical safety is that the current-carrying parts of the electrical installation must not be inaccessible to accidental contact, and open and third-party conductive parts accessible to touch must not be energized, representing a risk of electric shock both in normal operation of the electrical installation and in case of damage to the insulation.

Authors: Fainburg G.Z., Ovsyankin A.D., Potemkin V.I.

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