En 60079 Part 14 Pdf 42
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What is IEC/TS 60079-42 and how does it relate to IEC 60079-14
IEC/TS 60079-42 is a technical specification that provides guidance on electrical safety devices for the control of potential ignition sources in explosive atmospheres. It covers devices such as switches, relays, contactors, circuit breakers, fuses, sensors, transmitters, and controllers that are intended to prevent or limit the energy of sparks or arcs that could ignite an explosive mixture.
IEC/TS 60079-42 is not a mandatory standard, but it may be used for testing purposes or as a reference for designing and selecting electrical safety devices. It is part of the IEC 60079 series of standards that deal with explosive atmospheres. One of the most important standards in this series is IEC 60079-14, which specifies the requirements for the design, selection, and erection of electrical installations in explosive atmospheres.
IEC 60079-14 applies to both hazardous and non-hazardous locations, and it covers aspects such as:
The documentation required for the site, the equipment, the installation, and the verification of the competence of personnel
The initial inspection
Battery-powered equipment shall be certified for Gas Group IIC
Cables in hazardous areas shall be round and compact. The requirements also apply for cables for intrinsically safe circuits
Cable glands
New requirements for enclosures for more than one intrinsically safe circuit
Consideration of the dissipation power of terminal boxes
IEC/TS 60079-42 and IEC 60079-14 are complementary documents that aim to ensure the safety and reliability of electrical equipment and installations in explosive atmospheres. They provide guidance and best practices for manufacturers, installers, operators, and inspectors of such equipment and installations.
One of the most common types of electrical safety devices for explosive atmospheres is the intrinsically safe device. An intrinsically safe device is designed to limit the energy of electrical circuits and prevent sparks or arcs that could ignite an explosive mixture. Intrinsically safe devices are classified according to their level of protection and the type of explosive atmosphere they can operate in. For example, an intrinsically safe device with equipment protection level (EPL) Ga can be used in Zone 0, where an explosive gas atmosphere is present continuously or for long periods.
Another type of electrical safety device for explosive atmospheres is the flameproof device. A flameproof device is designed to withstand an internal explosion of an explosive mixture and prevent the transmission of the flame to the external atmosphere. Flameproof devices are enclosed in a robust casing that can resist the pressure and temperature of an internal explosion. Flameproof devices are classified according to their gas group and temperature class. For example, a flameproof device with gas group IIB and temperature class T4 can be used in Zone 1 or Zone 2, where an explosive gas atmosphere is likely or unlikely to occur.
A third type of electrical safety device for explosive atmospheres is the pressurized device. A pressurized device is designed to maintain a positive pressure inside the enclosure and prevent the ingress of an explosive mixture. Pressurized devices are supplied with a protective gas, such as air or inert gas, that is continuously or intermittently injected into the enclosure. Pressurized devices are classified according to their type of protection and degree of protection. For example, a pressurized device with type of protection px and degree of protection IP54 can be used in Zone 1 or Zone 21, where an explosive gas or dust atmosphere is likely to occur. 061ffe29dd