En 60079-0

[Billie Kjergaard]

Thisrevision of ANSI/UL 60079-0 dated July 19, 2024 is being issued to update the title page to reflect the most recent designation as a Reaffirmed American National Standard (ANS). No technical changes have been made.

The Seventh Edition of UL 60079-0 is an adoption of IEC 60079-0, Seventh Edition, issued by the IEC December 2017. Please note that the National Difference document incorporates all of the U.S. national differences for UL 60079-0.

The cost to purchase this Standard varies depending on whether you are ordering a hardcopy, PDF or combination of the two. We also offer two different types of subscriptions: a one year and a three year.

IEC 60079-0 and other standards supplementing this standard specify additional test requirements for Ex Equipment operating outside the standard temperature range, but further additional consideration and additional testing may be required for Ex Equipment operating outside the standard atmospheric pressure range and standard oxygen content.

This standard does not specify requirements for safety, other than those directly related to the explosion risk. Ignition sources like adiabatic compression, shock waves, exothermic chemical reaction, self-ignition of dust, naked flames and hot gases/liquids, are not addressed by this standard.

Prevailing API Recommended Practices (RP) as well as National Electric Code (NEC) and Canadian Electric Code (CEC) wiring requirements take precedence in the United States and Canada over normal IEC practices. This means that there are some subtle differences when selecting cable glands for use in hazardous locations classified as Zones.

There are additional testing requirements contained in the national standards, which include oil resistance tests for cable glands, and also cable pull-out resistance tests that involve greater tensile loads than those stipulated in IEC 60079-0.

In order to provide protection against ingress of dust and moisture, the North American system specifically requires testing of cable glands to ensure that the integrity of NEMA ratings for enclosures is maintained, so cable glands must also undergo supplementary NEMA enclosure rating tests, regardless of any IEC 60529 ingress protection ratings.

The tables below give examples of Cable Gland products which meet the ANSI / UL 514B, ANSI / UL 60079 and hence API, NEC, and CEC requirements for class and zone installations with their typical marking shown alongside.

Our glass reinforced polyester laminate, the primary material across our product range, is placed in a controlled atmospheric environment and subjected to DC voltage of 500 volts for a specified duration of time and the electrical resistance is measured. The electrical resistance is considered acceptable below a value of 1 Giga ohms, the value to produce a spark strong enough or temperatures high enough to ignite a specified hazardous gas.

The GRP laminate is tested at an independent testing laboratory validated to carryout examinations stipulated by IEC standards. Our GRP enclosures are then classified to IEC-60079-0 Clause No.26.13 certifying them to be Anti-Static. Adherence to the standard is mandatory across the GCC region and globally.

Founded in 1989 in the United Arab Emirates with a mission to manufacture composite solutions in glass reinforced polyester materials for the industrial sectors of power, water and oil & gas. The staple of the GRP product range are our weatherproof enclosures and kiosks which offer the highest classification of protection outdoors.

This part of IEC 60079 specifies general and testing requirements for electrical resistance trace heaters for application in explosive atmospheres with the exclusion of those for EPL Ga and Da. This standard covers trace heaters that comprise either factory or field (work-site) assembled units, and which may be series trace heaters, parallel trace heaters, trace heater pads, or trace heater panels that have been assembled and/or terminated in accordance with the manufacturer's instructions. This standard also includes requirements for termination assemblies and control methods used with trace heating systems. The explosive atmospheres referred to in this standard are those defined in IEC 60079-10-1 and IEC 60079-10-2. Annexes D and E outline the application of this standard for those users applying the Division method of area classification. This standard supplements and modifies the general requirements of IEC 60079-0, except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.

Learn More About P60079-30-1 P60079-30-2 IEEE/IEC Draft International Standard for Explosive atmospheres -- Part 30-2: Electrical resistance trace heating -- Application guide for design, installation and maintenance This part of IEC 60079 provides guidance for the application of electrical resistance trace heating systems in areas where explosive atmospheres may be present, with the exclusion of those classified as requiring Equipment Protection Level (EPL) Ga/Da (traditional relationship to Zone 0 and Zone 20 respectively). This standard also provides guidance for explosive atmospheres incorporating the Division method of area classification that may be applied by some users of this standard. NOTE Information on the Division method is given in NFPA 70 and CSA C22.1. It provides recommendations for the design, installation, maintenance and repair of trace heating systems including associated control and monitoring equipment. It does not cover devices that operate by induction heating, skin effect heating or direct pipeline heating, nor those intended for stress relieving.

Learn More About 60079-30-2-2015 These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.

Learn More About 515-2004 515-2011 IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Trace Heating for Industrial Applications Specific testing requirements for qualifying electrical resistance heating cables and heating devices for use in industrial applications, as well as a basis for electrical and thermal design, are included in this standard. Unclassified applications and explosive atmosphere applications that use both Divisions and Zone methods of classification are included.

Learn More About 515-2011 515-2017 IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Trace Heating for Industrial Applications Specific testing requirements for qualifying electrical resistance trace heating for use in industrial applications in ordinary locations, as well as a basis for electrical and thermal design, are included in this standard.

In the world of devices suitable for use in potentially explosive atmospheres, we tend to define equipment based on their mode of protection: explosion-proof enclosures, increased safety motors, limited-breathing lighting equipment or intrinsically safe sensors.

Yet, before responding to the dictates of the specific mode of protection, there are a series of general requirements that all equipment must comply with. The regulatory reference for these requirements is the IEC/EN 60079-0 standard.

The main materials of non-metallic origin in electrical equipment are plastic and elastomeric materials. Although we find glass and ceramic materials in many applications, from the lenses of lighting equipment to insulators for high voltages, most of electrically insulating parts are made of plastic. Examples are polycarbonate lenses, glass fiber reinforced polyester cases, and the countless parts that act as insulators inside sockets, plugs, connectors or terminals.

The main enemy of plastics is aging, a phenomenon of slow oxidation of polymers with which we are all familiar. The objects that surround us over the years lose mechanical resistance and water resistance, especially those exposed to bad weather and ultraviolet rays in an external environment.

For this reason, the regulatory requirements are particularly stringent: plastic materials must have the "TI" temperature index or the "RTI-mechanical" relative temperature index at least 20 degrees centigrade higher than the temperature reached in service. The same goes to elastomeric materials, with the difference that in this case the COT (continuous operating temperature) is taken as reference.

The third critical aspect to take into consideration is the possible formation of electrostatic charges on the surface, which is particularly insidious when the equipment is within reach of the operator who can therefore discharge this charge to the ground through his body and generate a spark.

Among the various options to manage this eventuality there is the reduction of the surface resistivity to a value lower than 10^9 Ohm. [2] This is often achieved using polymeric compounds containing graphite or carbon fibers which increase the conductivity of the compound and give the usual black color to "antistatic" plastic materials.

Very significant for non-metallic materials is the impact test that follows the temperature resistance cycle (thermal endurance) in a climatic cell. Materials stressed by heat and weakened by cold are subjected to the impact test using a mass dropped from different heights. The greater the height of the fall, the greater the energy of the resulting impact, ranging between 1 and 20 Joules.

The protection methods are explained and detailed in specific standards: explosion-proof in EN/IEC 60079-1, increased safety in EN/IEC 60079-7 and so on.EN/IEC 60079-0, the general requirements standard, is to be considered valid to the extent that it does not conflict with the standard of the protection method, in which case the latter prevails. [3]

When the risk arises from a paint, with a surface resistance >10^9 Ohm, in the case of group I and II equipment, action can be taken by limiting the thickness of the coating. In fact, it is believed that a thickness of less than 200 mm cannot accumulate a static charge with effective ignition levels (see note 6 Table 8 EN 60079-0).

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