59024-12

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59024-12: Application Field and Working Principle

59024-12 is a set of electrical standards based on Safety Extra Low Voltage (SELV). The SELV guidelines are designed to make sure people working with, as well as using, electrical equipment are protected from injury and fire hazards. This set of standards is applicable to electrical equipment used in industrial and commercial areas, particularly in areas where there is a higher risk from electric shock.

What is Safety Extra Low Voltage (SELV) Regulation?

Safety Extra Low Voltage (SELV) regulation is a set of electrical provisions and practices that work in order to minimize exposure to electrical hazards, such as electric shock and fire. This set of standards is meant for use in non-hazardous areas, in order to provide optimum safety for employees and other users of electrical equipment.

This combination of safety standards prevents electrical shocks resulting from direct contact with exposed live parts. It also offers protection from hazards resulting from direct contact with live conductors, due to limited current flow.

What is the Purpose of SELV Regulation?

The purpose of SELV regulation is to reduce the risk of electric shock in equipment or environments where human contact with the electrical circuit is likely. It is also meant to reduce the chances of a fire starting, as SELV measures can help to provide protection from damage caused by overheating.

SELV regulation is mainly applicable to industrial and commercial areas, as well as areas where people come into contact with low voltage electrical equipment. This includes business offices, warehouses, laboratories, construction sites, manufacturing plants, medical facilities, and other similar areas.

Principle and Elements of SELV Regulation

SELV regulation follows the basic principle of making sure that the voltage seen between two points of contact with electric current remains below 25 volts. This is the amount of voltage generally considered to be safe for humans and other animals.

The following elements make up the essential components of SELV regulation:

• Proper Grounding. The ground wire of the circuit must be connected to the earth and provide a complete path of low resistance. This ensures that any fault current is properly diverted away from the live parts of the circuit.
• Overvoltage Protection. A voltage surge due to line-leakage or transients must be safely diverted away from the equipment. This is generally achieved by using a surge protector or over-voltage protective device.
• Overcurrent Protection. Overcurrent circuits must also be used in order to ensure that an overcurrent situation is interrupted in order to prevent damage to the equipment and to avoid hazards.
• Isolation Transformers or Circuit Breakers. Isolation transformers or circuit breakers must also be used in order to provide isolation between the equipment and the power grid. This provides protection from electric shock and also helps to mitigate the transfer of transient currents between equipment and the power grid.

Conclusion

SELV regulation is a set of guidelines and practices that aim to reduce the risk of electric shock and fire hazards in areas where human contact with equipment using electricity is likely. The principle stated in this regulation requires that the voltage between two points of contact of electric current remain below 25 volts. This is made possible with the use of appropriate grounding, overvoltage protection, overcurrent protection, and circuit breaker or isolation transformer.

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