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UL 80079-36 Ed. 1-2021

Explosive Atmospheres - Part 36: Non-Electrical Equipment for Explosive Atmospheres - Basic Method and Requirements


1 Scope This  standard  part of ISO/IEC 80079  specifies the basic method and requirements for design, construction, testing and marking of non-electrical Ex equipment, Ex Components, protective systems, devices and assemblies of these products that have their own potential ignition sources and are intended for use in explosive atmospheres. Hand tools and manually operated equipment without energy storage are excluded from the scope of this standard. This standard does not address the safety of  static  fixed  autonomous process equipment when it is not part of equipment referred to in this standard. NOTE 1  Static  Fixed  autonomous process equipment includes items such as tanks, vessels, fixed pipework and hand operated valves which do not have their own source of energy that could create a potential ignition source during operation. This standard does not specify requirements for safety, other than those directly related to the risk of ignition which may then lead to an explosion. The standard atmospheric conditions (relating to the explosion characteristics of the atmosphere) under which it may be assumed that equipment can be operated 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.  Such atmospheres can also exist inside the equipment. In addition, the external atmosphere can be drawn inside the equipment by natural breathing produced as a result of fluctuations in the equipment’s internal operating pressure, and/or temperature.  NOTE 2 Although the standard atmospheric conditions above give a temperature range for the atmosphere of  –20 °C  to +60 °C, the normal ambient temperature range for the equipment is –20 °C to +40 °C, unless otherwise specified and marked. It is considered that –20 °C to +40 °C is appropriate for most equipment and that to manufacture all equipment to be suitable for a standard atmosphere upper ambient temperature of +60 °C would place unnecessary design constraints. NOTE 3 The requirements of this standard can also be helpful for the design, construction, testing and marking of equipment intended for use in atmospheres outside the validity range stated above. In this case however, the ignition hazard assessment, ignition protection provided, additional testing (if necessary), manufacturer’s technical documentation and instructions to the user, clearly demonstrate and indicate the equipment’s suitability for the conditions it may encounter. It is also recognized that changes in temperature and pressure can have a significant influence on characteristics of the explosive atmosphere, such as ignitability.  This  standard  part of ISO/IEC 80079  specifies the requirements for the design and construction of equipment, intended for explosive atmospheres in conformity with all Equipment Protection Levels (EPLs) of Group I, II and III. NOTE 4 It is not unusual for equipment designed and constructed in accordance with this standard for a particular EPL to be used in areas requiring an EPL with a higher level of safety by including the application of additional measures. Such measures include for example inerting, suppression, venting or containment or for example by dilution, drainage, monitoring and shut-down. Such measures are outside the scope of this standard.  This standard supplements and modifies the general requirements of  IEC  UL  60079-0, as shown in . Where a requirement of this standard conflicts with a requirement of IEC  UL  60079-0, as far as applicable for non-electrical equipment, the requirement of this standard takes precedence. This standard is supplemented or modified by the following standards concerning specific types of protection:  –  ISO  UL  80079-37, Explosive atmospheres – Part 37: Non-electrical equipment for explosive atmospheres – Non-electrical type of protection constructional safety "c", control of ignition source "b", liquid immersion "k" –  IEC  UL  60079-1, Explosive atmospheres – Part 1: Equipment protection by flameproof enclosures "d" –  IEC  UL  60079-2, Explosive atmospheres – Part 2: Equipment protection by pressurized enclosures "p" –  IEC  UL  60079-31, Explosive atmospheres – Part 31: Equipment dust ignition protection by enclosure "t" The nature and ignition sources of non-electrical equipment shall be considered when applying types of protection "d", "p", or "t" on non-electrical equipment (see Annex G).  DR Where references are made to IEC and ISO standards, the reference requirements found in these standards shall apply as modified by any applicable US National Differences for that standard (see Clause 2).  Clause of  IEC  UL  60079-0 IEC  UL  60079-0 application to Ed 6.0 (2011) (Inf.)  Clause / Sub-Clause Title (Normative)  ISO  UL  80079-36 ISO  UL  80079-37 "c"  "b"  "k"  4  Equipment grouping  Modified (see Clause 4)  (*)  (*)  (*)  4.1  Group I  Applies  (*)  (*)  (*)  4.2  Group II  Applies  (*)  (*)  (*)  4.3  Group III  Modified (see 4)  (*)  (*)  (*)  4.4  Equipment for a particular explosive atmosphere  Applies  (*)  (*)  (*)  5  Temperatures  Modified (see 2 and )  (*)  (*)  (*)  5.1  Environmental influences  Applies  (*)  (*)  (*)  5.1.1  Ambient temperature  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  5.1.2  External source of heating or cooling  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  5.2  Service temperature  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  5.3.1  Determination of maximum surface temperature  Modified (see 3) non-electrical  (*)  (*)  (*)  5.3.2.1  Group I electrical equipment  Modified (see 4) non-electrical  (*)  (*)  (*)  5.3.2.2  Group II electrical equipment  Modified (see 5) non-electrical  (*)  (*)  (*)  5.3.2.3  Group III electrical equipment  Modified (see 7) non-electrical  (*)  (*)  (*)  5.3.3  Small component temperature for Group I and Group II electrical equipment  Modified (see 6) non-electrical  (*)  (*)  (*)  6.  Requirements for all electrical equipment  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  6.1  General  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  6.2  Mechanical strength of equipment  Applies  (*)  (*)  (*)  6.3  Opening times  Modified (see 3)  (*)  (*)  (*)  6.4  Circulating currents in enclosures (e.g. of large electrical machines)  Applies  (*)  (*)  (*)  6.5  Gasket retention  Applies  (*)  (*)  (*)  6.6  Electromagnetic and ultrasonic energy radiating equipment  Excluded  –  –  –  7  Non-metallic enclosures and non-metallic parts of enclosures  Applies  (*)  (*)  (*)  7.1  General  Applies  (*)  (*)  (*)  7.1.1  Applicability  Applies  (*)  (*)  (*)  7.1.2  Specification of materials  Applies  (*)  (*)  (*)  7.2  Thermal endurance  Applies  (*)  (*)  (*)  7.3  Resistance to light  Applies  (*)  (*)  (*)  7.4  Electrostatic charges on external non-metallic materials  Modified (see 4, 5 and 6)  (*)  (*)  (*)  7.5  Accessible metal parts  Applies  (*)  (*)  (*)  8  Metallic enclosures and metallic parts of enclosures  Modified (see 1 Footnote 1) and ref. to ISO 6507-1  (*)  (*)  (*)  8.1  Material composition  Modified (see 1 Footnote 1) and ref. to ISO 6507-1  (*)  (*)  (*)  8.2  Group I  Modified (see 1 Footnote 1) and ref. to ISO 6507-1  (*)  (*)  (*)  8.3  Group II  Modified (see 1 Footnote 1) and ref. to ISO 6507-1  (*)  (*)  (*)  8.4  Group III  Modified (see 1 Footnote 1) and ref. to ISO 6507-1  (*)  (*)  (*)  9  Fasteners  Excluded  –  –  –  10  Interlocking devices  Excluded  –  –  –  11  Bushings  Excluded  –  –  –  12  Materials used for cementing  Applies (see 6)  (*)  (*)  (*)  13  Ex Components  Applies  (*)  (*)  (*)  14  Connection facilities and termination compartments  Excluded  –  –  –  15  Connection facilities for earthing or bonding conductors  Excluded  –  –  –  16  Entries into enclosures  Excluded  –  –  –  17  Supplementary requirements for rotating machines  Excluded  –  –  –  18  Supplementary requirements for switchgear  Excluded  –  –  –  19  Supplementary requirements for fuses  Excluded  –  –  –  20  Supplementary requirements for plugs, socket outlets and connectors  Excluded  –  –  –  21  Supplementary requirements for luminaires  Excluded  –  –  –  22  Supplementary requirements for caplights and handlights  Excluded  –  –  –  23  Equipment incorporating cells and batteries  Excluded  –  –  –  24  Documentation  Modified (see 9)  (*)  (*)  (*)  25  Compliance of prototype or sample with documents  Applies  (*)  (*)  (*)  26  Type Tests  Modified (see 8)  (*)  (*)  (*)  26.1  General  Applies  (*)  (*)  (*)  26.2  Test configuration  Applies  to be read as non-electrical equipment  (*)  (*)  (*)  26.3  Tests in explosive test mixtures  Applies  (*)  (*)  (*)  26.4.1  Order of tests  Excluded  –  –  –  26.4.2  Resistance to impact  Applies (see 1)  (*)  (*)  (*)  26.4.3  Drop test  Applies (see 2)  (*)  (*)  (*)  26.4.4  Acceptance criteria  Applies (see 3  (*)  (*)  (*)  26.4.5  Degree of protection (IP) by enclosure  Applies  (*)  (*)  (*)  26.5.1.1  General  Applies  (*)  (*)  (*)  26.5.1.2  Service temperature  Applies  (*)  (*)  (*)  26.5.1.3  Maximum surface temperature  Modified (see 2)  (*)  (*)  (*)  26.5.2  Thermal shock test  Applies  (*)  (*)  (*)  26.5.3  Small component ignition test (Group I and Group II)  Excluded  –  –  –  26.6  Torque test for bushings  Excluded  –  –  –  26.7  Non-metallic enclosures or non-metallic parts of enclosures  Applies  (*)  (*)  (*)  26.8  Thermal endurance to heat  Applies (see 4)  (*)  (*)  (*)  26.9  Thermal endurance to cold  Applies (see 5)  (*)  (*)  (*)  26.10  Resistance to light  Applies  (*)  (*)  (*)  26.11  Resistance to chemical agents for Group I electrical equipment  Applies (see 6)  (*)  (*)  (*)  26.12  Earth continuity  Excluded  –  –  –  26.13  Surface resistance test of parts of enclosures of non-metallic materials  Applies  (*)  (*)  (*)  26.14  Measurement of capacitance  Excluded  –  –  –  26.15  Verification of ratings of ventilating fans  Excluded  –  –  –  26.16  Alternative qualification of elastomeric sealing O-rings  Applies  (*)  (*)  (*)  27  Routine tests  Applies  (*)  (*)  (*)  28  Manufacturer's responsibility  Modified (see 1)  (*)  (*)  (*)  29  Marking  Modified (see 11)  (*)  (*)  (*)  30  Instructions  Modified (see 10)  (*)  (*)  (*)  30.1  General  Applies  (*)  (*)  (*)  30.2  Cells and batteries  Excluded  –  –  –  30.3  Electrical machines  Excluded  –  –  –  30.4  Ventilating fans  Excluded  –  –  –  (*) This requirement concerns also equipment protected by types of protection "c", "b" and "k".  Applies – This requirement of  IEC  UL  60079-0 is applied without change. Excluded – This requirement of  IEC  UL  60079-0 does not apply. Modified – This requirement of  IEC  UL  60079-0 is modified as detailed in this standard. DE The applicable requirements of  IEC  UL  60079-0 are identified by the clause title which is normative. This document was written referring to the specific requirements of IEC  UL  60079-0 Ed. 6.0: 2011  2013  , The clause numbers for the 6th edition are shown for information only. This is to enable the General Requirements IEC  UL  60079-0 Ed. 5.0: 2007  2009  or UL 60079-0 Ed. 7.0:2019  to be used where necessary with this part of ISO 80079. Where there were no requirements for the 5th edition or where there is a conflict between requirements, the 6th edition requirements should be considered.


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