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Electric Explosive Atmosphere Standards

Standards for the use of an electrical apparatus in a potentially explosive atmosphere, such as in the presence of combustible dust, or in Zone 20, Zone 21, or Zone 22 Hazardous (Classified) locations, detail the inherent dangers of the association between an electrical device and a surrounding ignitable atmosphere. Focusing on intrinsic solutions, this array of standards outlines their general requirements, construction, and testing. Additionally, hose assemblies for protecting electrical cables are addressed, as well as test methods for determining the minimum ignition temperature and electrical resistivity of dust.

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ISO/IEC 80079-20-2:2016

Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods

ISO/IEC 80079-20-2:2016 is published as a dual logo standard and describes the test methods for the identification of combustible dust and combustible dust layers in order to permit classificationof areas where such materials exist for the purpose of the proper selection and installation of electrical and mechanical equipment for use in the presence of combustible dust. The standard atmospheric conditions for determination of characteristics of combustible dusts are:- temperature -20 C to 60 C,- pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar) and- air with normal oxygen content, typically 21 % v/v. The test methods defined do not apply to:- recognized explosives, propellants (e.g. gunpowder, dynamite), or substances or mixtures of substances which may, under some circumstances, behave in a similar manner or- dusts of explosives and propellants that do not require atmospheric oxygen for combustion, or to pyrophoric substances. This first edition cancels and replaces the first edition of IEC 61241-2-1 published in 1994, the first edition of IEC 61241-2-2 published in 1993 and the first edition of IEC 61241-2-3 published in 1994, combining the requirements into a single document, and is considered to constitute a technical revision. Significant changes with respect to IEC 61241-2-1:1994, IEC 61241-2-2:1993 and IEC 61241-2-3:1994 can be found in the foreword of the document. Keywords: combustible dust


ANSI/ISA 12.01.01-2013

Definitions and Information Pertaining to Electrical Equipment in Hazardous (Classified) Locations

This document provides general guidance for safe design, installation, and maintenance of electrical equipment in hazardous (classified) locations using appropriate means to prevent ignition of flammable gases and vapors, flammable liquids, combustible dusts, or ignitable fibers or flyings.


ANSI/ISA 12.10.06-2006 (R2011)

Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations - Protection by Pressurization "pD"

This standard gives requirements on the design, construction, testing and marking of electrical apparatus for use in combustible dust atmospheres in which a protective gas (air or inert gas), maintained at a pressure above that of the external atmosphere, is used to prevent the entry of dust which might otherwise lead to the formation of a combustible mixture within enclosures which do not contain a source of combustible dust.


ANSI/ISA 12.12.01-2015

Nonincendive Electrical Equipment for Use in Class I and II, Division 2 and Class III, Divisions 1 and 2 Hazardous (Classified) Locations

The purpose of this standard is to provide minimum requirements for the design, construction, and marking of electrical equipment or parts of such equipment for use in Class I and Class II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations. This equipment, in normal operation, is not capable of causing ignition of the surrounding atmosphere under the conditions prescribed in this standard, although the equipment may contain electronic components used in an incendive circuit and may also have field wiring that is an incendive circuit. In addition, it is the intent of this document to establish uniformity in test methods for determining the suitability of the equipment and associated circuits and components as they relate to potential ignition of a specific flammable gas or vapour-in-air mixture, combustible dust, easily ignitible fibers, or flyings.


ANSI/ISA 12.12.03-2011

Standard for Portable Electronic Products Suitable for Use in Class I and II, Division 2, Class I Zone 2 and Class III, Division 1 and 2 Hazardous (Classified) Locations

This standard applies to both body-worn and hand-held portable electronic products for use in Class I and II, Division 2, Class I, Zone 2, and Class III, Division 1 and 2 Hazardous (Classified) Locations which are not available listed or labeled for hazardous (classified) locations.


ANSI/ISA 61241-0 (12.10.02)-2006 (R2015)

Electrical Apparatus for Use in Zone 20, Zone 21, and Zone 22 Hazardous (Classified) Locations - General Requirements

This standard specifies general requirements for the design, construction, testing and marking which is applicable to electrical apparatus protected by any recognized safeguard protection technique for use in areas where combustible dust may be present in quantities that could lead to a fire or explosion hazard. This standard is supplemented or modified by the following standards concerning specific types of protection: - ANSI/ISA-61241-1 (12.10.03), Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations ? Protection by Enclosures ôtDö - ANSI/ISA-61241-2 (12.10.06), Electrical Apparatus for Use in Zone 21 and Zone 22 Hazardous (Classified) Locations ? Protection by Pressurization ôpDö - ANSI/ISA-61241-11 (12.10.04), Electrical Apparatus for Use in Zone 20, Zone 21, and Zone 22 Hazardous (Classified) Locations ? Protection by Intrinsic Safety ôiDö - ANSI/ISA-61241-18 (12.10.07), Electrical Apparatus for Use in Zone 20, Zone 21 and Zone 22 Hazardous (Classified) Locations ? Protection by Encapsulation ômDö The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires additional protective measures. This standard does not specify requirements for safety, other than those directly related to the explosion risk. Where the apparatus has to meet other environmental conditions, for example, protection against ingress of water and resistance to corrosion, additional methods of protection may be necessary. The method used is not to adversely affect the integrity of the enclosure. This standard does not apply to dusts of explosives that do not require atmospheric oxygen for combustion, or to pyrophoric substances. This standard is not applicable to electrical apparatus intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. Electrical apparatus and Ex components for use in explosive dust atmospheres shall also comply with the applicable requirements for similar apparatus for use in unclassified locations.


ANSI/ISA 12.10.05-2013

Explosive Atmospheres û Part 10-2: Classification of areas û Combustible dust atmospheres

This standard is concerned with the identification and classification of areas where explosive dust atmospheres and combustible dust layers are present, in order to permit the proper assessment of ignition sources in such areas.


ANSI/ISA 61241-11 (12.10.04)-2006 (R2015)

Electrical Apparatus for Use in Zone 20, Zone 21 and Zone 22 Hazardous (Classified) Locations - Protection by Intrinsic Safety "iDö

This standard specifies requirements for the construction and testing of intrinsically safe apparatus intended for use in an explosive dust atmosphere and for associated apparatus that is intended for connection to intrinsically safe circuits which enter such atmospheres. This standard supplements the general requirements of ANSI/ISA-61241-0: except as indicated in Table A. Where a requirement of this standard conflicts with a requirement of ANSI/ISA-61241-0 the requirements of this standard shall take precedence. NOTE Intrinsically safe and associated intrinsically safe apparatus utilized in systems should shall meet the requirements of ANSI/ISA-RP12.06.01. If associated apparatus is protected by a type of protection listed in ANSI/ISA-61241-0 or ANSI/ISA-60079-0 then the requirements of that method of protection together with the relevant standards, ISA-61241-X or ANSI/ISA-60079-X, also apply to the associated apparatus. The list of exclusions in Table A is directly applicable to associated apparatus intended for use in situations where there is no explosive dust atmosphere and in other circumstances should be used in combination with the requirements of the other methods of protection.


ANSI/ISA 61241-18 (12.10.07)-2006 (R2015)

Electrical Apparatus for Use in Zone 20, Zone 21 and Zone 22 Hazardous (Classified) Locations - Protection by Intrinsic Safety "mD"

This standard is to be read in conjunction with ANSI/ISA-61241-0, the requirements of which apply to electrical apparatus protected by encapsulation and surface temperature limitation unless specifically excluded. This standard is applicable to electrical apparatus protected by encapsulation type of protection ômD" and surface temperature limitation for use in areas where combustible dust may be present in quantities which could lead to a fire or explosion hazard. It specifies requirements for design, construction and testing of electrical apparatus, parts of electrical apparatus and Ex components where the rated voltage does not exceed 10 kV. NOTE 1 The actual working voltage may exceed the value given above by up to 10 %. NOTE 2 Apparatus within the scope of this standard may also be subjected to additional requirements in other standards û for example, ANSI/ISA-60079-0 (ôElectrical apparatus for explosive gas atmospheres - Part 0: General requirementsö). The application of electrical apparatus in atmospheres which may contain explosive gas as well as combustible dust, whether simultaneously or separately, requires additional protective measures. This standard does not apply to dusts of explosives which do not require atmospheric oxygen for combustion, or to pyrophoric substances. This standard is not applicable to electrical apparatus intended for use in underground parts of mines as well as those parts of surface installations of such mines endangered by firedamp and/or combustible dust. This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. This standard does not include other types of protection and is only applicable to protection by encapsulation.





BS EN 50394-1:2004

Electrical apparatus for potentially explosive atmospheres. Group I. Intrinsically safe systems. Construction and testing (British Standard)

1.1 This European Standard contains the requirements for construction and testing of Group Iintrinsically safe electrical systems intended for use, as a whole or in part, in atmospheres susceptible tofiredamp.1.2 This European Standard supplements EN 50020, the requirements of which apply to electricalapparatus used in intrinsically safe electrical systems. It is intended to apply to systems placed on the market by a manufacturer or their authorised representative, or systems assembled by the user, using products separately conforming with EN 50020.NOTE If the user intends to assemble a system using a product not conforming with EN 50020, then the user assumes the responsibilities of the system manufacturer and needs to follow the conformity assessment procedure.1.3 This European Standard does not deal with the selection of suitable equipment, or the installationof intrinsically safe electrical apparatus, associated electrical apparatus, to form an intrinsically safeelectrical system.NOTE National Regulations may impose additional requirements for the selection, installation and use of intrinsically safe systems in mines.


IEC 60079-2 Ed. 6.0 b:2014

Explosive atmospheres - Part 2: Equipment protection by pressurized enclosure "p"

NEW! IEC 60079-2:2014 is available as IEC Standards+ 60079-2:2014 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60079-2:2014 contains the specific requirements for the construction and testing of electrical equipment with pressurized enclosures, of type of protection "p", intended for use in explosi ve gas atmospheres or explosive dust atmospheres. It also includes the requirements for pressurized enclosures containing a limited release of a flammable substance. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard take precedence. This standard does not include the requirements for: - pressurized enclosures where the containment system may release air with an oxygen content greater than normal, or oxygen in combination with inert gas where the oxygen is in a proportion greater than 21 %; - pressurized rooms or analyser houses; see IEC 60079-13; - pressurized enclosures used where "explosives" or pyrotechnics are present; - pressurized enclosures used where hybrid mixtures of gas/vapour and combustible dust are present; - pressurized enclosures used where pyrophoric substances such as explosives or propellants containing their own oxidizers are present; - pressurized enclosures with an internal source of release of combustible dust. This sixth edition cancels and replaces the fifth edition published in 2007. This sixth edition cancels and replaces the first edition of IEC 61241-4 published in 2001. This sixth edition constitutes a technical revision. The significance of changes between IEC 60079-2, Edition 6.0, 2014 and IEC 60079-2, Edition 5.0, 2007 are as listed in the foreword of the document. Keywords: electrical equipment with pressurized enclosures, type of protection "p", explosive gas atmospheres, explosive dust atmospheres


ISO 10807:1994

Pipework - Corrugated flexible metallic hose assemblies for the protection of electrical cables in explosive atmospheres

Specifies the design characteristics of corrugated flexible metallic hose which can be used to protect electrical wire and cable in explosive atmospheres or atmospheres where there is a risk of fire. These hoses can be used as static protection or for the protection of cables moved infrequently, occasionally, or less than once week. Also provides instructions for the use of these hoses and the tests required for type approval.


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