Supplies of lighting and electrical installations

Electrical protection classes

Classes of electrical protection - a system of symbols of methods and degree of electrical safety when using electrical equipment.

There are four classes of protection: 0, I, II and III.

Class 0 - equipment in which protection against electric shock is provided by the main insulation, with no electrical connection of open conductive parts, if any, with a protective conductor of stationary wiring. In the event of a breakdown of the main insulation, protection must be provided by the environment (air, floor insulation, etc.).

Class I - equipment in which protection against electric shock is provided by the main insulation and connection of open conductive parts, accessible to the touch, with a protective conductor of stationary wiring. In this case, exposed conductive parts that can be touched cannot be energized if the insulation is damaged after the protection has been applied. Equipment intended for use with a flexible cable includes a protective conductor that is part of the flexible cable.

Class II - equipment in which protection against electric shock is provided by the use of double or reinforced insulation. Class II devices do not have protective earthing devices and the protective properties of the environment are not used as safety measures. In some special cases (for example, for input terminals of electronic equipment) class II equipment may be provided with protective resistance if necessary and its use does not reduce the level of safety.

Equipment of this class may be equipped with means to ensure continuous monitoring of the integrity of the safety chains, provided that these components form an integral part of the equipment and are isolated from accessible surfaces in accordance with the requirements for Class II equipment. In some cases, a distinction must be made between Class II equipment "completely insulated" and equipment "with a metal shell". Class II equipment with a metal shell may be provided with means for connecting the shell to the equipotential bonding conductor only if this requirement is provided for in the standard for the relevant equipment.

Class III - equipment in which protection against electric shock is built on power from a source of safe ultra-low voltage and in which there are no voltages above the safe ultra-low voltage. Class III equipment must not have a grounding clamp. Class III equipment with a metal shell may be supplied with means for connecting the shell to the equipotential bonding conductor, provided that this requirement is provided for in the standard for the relevant equipment. Class III equipment may be provided with a grounding device for functional purposes other than a grounding device used for protective purposes, provided that this requirement is provided for in the standard for the relevant equipment.

Electric plug corresponding to class 0 Electric plug with earthing contact (class I)
Electric plug corresponding to class 0 Electric plug with earthing contact (class I)
Electric plug for protection class II (with double insulation) Vikonan electric plug for Zakhistu class III
Electric plug for protection class II (with double insulation) Vikonan electric plug for Zakhistu class III
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