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1、Approval Standard for Nonincendive Electrical Equipment for Use in Class I and II, Division 2, and Class III, Divisions 1 and 2, Hazardous (Classified) Locations Class Number 3611 December 2004 2004 FM Approvals LLC. Portions ISA. Reprinted by permission. All rights reserved. Foreword Approval Stand
2、ards are intended to verify that the products and services described will meet stated conditions of performance, safety and quality useful to the ends of property conservation. The purpose of Approval Standards is to present the criteria for Approval of various types of products and services, as gui
3、dance for FM Approvals personnel, manufacturers, users and authorities having jurisdiction. Products submitted for Approval shall demonstrate that they meet the intent of the Approval Standard, and that quality control in manufacturing and/or applications shall ensure a consistently uniform and reli
4、able product or service. Approval Standards strive to be performance-oriented and to facilitate technological development. For examining equipment, materials and services, Approval Standards: a) must be useful to the ends of property conservation by preventing, limiting or not causing damage under t
5、he conditions stated by the Approval listing; and b) must be readily identifiable. Continuance of Approval and Listing depends on compliance with the Master Agreement, satisfactory performance in the field, on successful re-examinations of equipment, materials, and services as appropriate, and on pe
6、riodic follow-up audits of the manufacturing facility or service/application. FM Approvals LLC reserves the right in its sole judgement to change or revise its standards, criteria, methods, or procedures. -,-,- TABLE OF CONTENTS 1. PURPOSE . 1 2. SCOPE 1 3. DEFINITIONS . 3 4. GENERAL REQUIREMENTS. 6
7、 5. REQUIREMENTS FOR CLASS I, DIVISION 2 EQUIPMENT . 6 6. REQUIREMENTS FOR CLASS II, DIVISION 2 AND CLASS III, DIVISION 1 AND 2 EQUIPMENT 7 7. NONINCENDIVE CIRCUITS AND NONINCENDIVE FIELD WIRING . 7 8. NORMALLY NONARCING COMPONENTS. 9 9. MARKING . 10 10. SURFACE TEMPERATURE REQUIREMENTS 12 11. EVALU
8、ATION OF NONINCENDIVE CIRCUITS 12 12. EVALUATION OF NONINCENDIVE COMPONENTS . 15 13. EVALUATION OF SEALED DEVICE 16 14. EVALUATION OF ENCLOSURES FOR CLASS II AND III. 17 15. DROP AND IMPACT TESTS. 19 16. MANUFACTURERS INSTRUCTIONAL MANUAL AND DOCUMENTATION 19 17. OPERATIONS REQUIREMENTS . 20 APPENDI
9、X A: EXPLANATORY MATERIAL . 21 APPENDIX B: IGNITION CURVES . 28 APPENDIX C: GENERAL INFORMATION 36 C-1 Approval Application Requirements 36 C-2 Requirements for Samples for Examination . 37 APPENDIX D: UNITS OF MEASUREMENT . 38 1.* PURPOSE 1.1 This standard states Approval criteria for electrical eq
10、uipment for use in Class I and II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations as defined in Articles 500, 501, 502, and 503 of the National Electrical Code, ANSI/NFPA-70 (NEC). 1.2 The effective date of an Approval standard mandates that all products tested for App
11、roval after the effective date shall satisfy the requirements of that standard. Products FM Approved under a previous edition shall comply with the new version by the effective date or forfeit Approval. The effective date of this Standard is January, 2005 for compliance with all requirements. 2. SCO
12、PE 2.1 This standard sets performance requirements for the construction and testing of electrical apparatus, or parts of such apparatus, for use in Class I and II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations. 2.2 Electrical equipment intended for use in Class I and
13、II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations is apparatus in which any spark or thermal effect, produced under normal conditions, is incapable of causing ignition of a specified mixture of flammable or combustible material in air. 2.3 Application and Requirements
14、 A. This standard applies only to equipment, circuits, or components designed and assessed specifically for use in Class I and II, Division 2, and Class III, Divisions 1 and 2 hazardous (classified) locations as defined by the NEC. It is recognized that general purpose apparatus may also be suitable
15、 for Class I and II, Division 2, and Class III, Divisions 1 and 2 under certain conditions specified in the NEC. B. This standard is primarily intended to provide requirements for process measurement and control equipment; however, the principles may be applied to similar types of electrical equipme
16、nt. C.* The requirements of this standard are based on consideration of ignition in locations made hazardous by the presence of flammable gases or vapor-in-air mixtures, or combustible dusts, and fibers, and flyings under normal atmospheric conditions. For the purposes of this standard, normal atmos
17、pheric conditions are considered to be: a) an ambient temperature of -4F (-20C) to 104F (40C); b) an oxygen concentration of not greater than 21 percent by volume; and c) a pressure of 12.5 to 15.7 psia (86 to 108 kPa) Note: EQUIPMENT SPECIFIED FOR ATMOSPHERIC CONDITIONS BEYOND THE ABOVE LIMITS IS S
18、UBJECT TO SPECIAL INVESTIGATION. 2.4* Mechanisms of Ignition This standard does not cover mechanisms of ignition from external sources, such as static electricity or lightning, which are not related to the electrical characteristics of the equipment. December 20043611 FM APPROVALS1 *AN ASTERISK FOLL
19、OWING A WORD OR A SECTION NUMBER SIGNIFIES THAT EXPLANATORY MATERIAL APPEARS IN THE APPENDIX. 2.5 Applicability of Other Standards A. Except where modified by the requirements of this standard, electrical equipment shall comply with the applicable requirements for ordinary locations, in accordance w
20、ith Approval Standard 3600. B. This standard does not cover equipment for use in Class I and II, Division 1 hazardous locations, such as equipment constructed to be intrinsically safe, explosion-proof or dust-ignition proof; however, such equipment is suitable for use in Class I and II, Division 2,
21、and Class III, Divisions 1 and 2 hazardous (classified) locations in the same Group for which it is suitable in Division 1 when installed in accordance with the NEC. C. This standard does not cover equipment utilizing purged or pressurized enclosures; however, such equipment is considered suitable f
22、or use in Class I and II, Division 2 and Class III, Divisions 1 and 2 hazardous (classified) locations when designed to meet the requirements of ANSI/NFPA Standard 496-1998, Purged and Pressurized Enclosures for Electrical Equipment. D. For flashlights and lanterns the requirements of this standard
23、are supplemented by Approval Standard 3613 Electric Flashlights and Lanterns for Use in Class I, Division 2, Class I, Zone 2 Hazardous (Classified) Locations E. This standard does not cover electric lighting fixtures for use in Division 2 hazardous (classified) locations. F. This standard does not c
24、over electric motors, electric heaters, heat-tracing cables, and similar heat- producing devices, except where they are an integral part of the equipment under evaluation for use in Division 2 locations. The requirements covered in ANSI standards whose scope includes such equipment will be considere
25、d. 2.6 Basis for Requirements See Approval Standard 3600. 2.7 Basis for Approval Approval is based upon satisfactory evaluation of the product and the manufacturer. These requirements are listed in Approval Standard 3600. 2.8 Basis for Continued Approval Continued Approval is based upon: a) producti
26、on or availability of the product as currently FM Approved; b) the continued use of acceptable quality assurance procedures; c) satisfactory field experience; d) compliance with the terms stipulated in the Master Agreement; e) re-examination as necessary, of production samples for continued conformi
27、ty to requirements. 2.9 System of Units Where units of measurement are expressed in U.S. customary units, they are followed by their arithmetic equivalents in International System (SI) units, enclosed in parentheses. Conversions are in accordance with ANSI/IEEE/ASTM SI 10-97 Standard for Use of the
28、International System of Units (SI): The Modern Metric System. Where units of measurement are expressed in SI units, no US customary units may be provided. 3611December 2004 2FM APPROVALS *AN ASTERISK FOLLOWING A WORD OR A SECTION NUMBER SIGNIFIES THAT EXPLANATORY MATERIAL APPEARS IN THE APPENDIX. 2.
29、10 This document does not cover the requirements for Class I, Zone 2 except as permitted by NEC(ANSI/ NFPA 70:1999) Article 505-10 (b)(1). Specific requirements can be found in Approval Standard 3600 and ANSI/ISA 12.12.02 (IEC60079-15-1987 Mod). 3. DEFINITIONS For purposes of this standard, the foll
30、owing terms apply: 3.1 associated nonincendive field wiring apparatus: Apparatus in which the circuits are not necessarily nonincendive themselves, but that affect the energy in nonincendive field wiring circuits and are relied upon to maintain nonincendive energy levels.Associated nonincendive fiel
31、d wiring apparatus may be either of the following: a) Electrical apparatus that has an alternative type of protection for use in the appropriate hazardous (classified) location or b) Electrical apparatus not so protected that shall not be used in a hazardous (classified) location Note: ASSOCIATED NO
32、NINCENDIVE FIELD WIRING APPARATUS HAS DESIGNATED ASSOCIATED NONINCENDIVE FIELD WIRINGAPPARATUS CONNECTIONS FOR NONINCENDIVE FIELD WIRINGAPPARATUSAND MAYALSO HAVE CONNECTIONS FOR OTHER ELECTRICAL APPARATUS. 3.2 control drawing: A drawing or other document provided by the manufacturer of the nonincend
33、ive field wiring apparatus or the associated nonincendive field wiring apparatus that details the allowed interconnections with other circuits or apparatus. 3.3 dust-tight: Constructed in a manner that dust will not enter the enclosing case under specified test conditions. 3.4 hermetically sealed de
34、vice: A device that is sealed against the entrance of an external atmosphere and in which the seal is made by fusion e.g., soldering, brazing, welding, or the fusion of glass to metal. 3.5 maintenance, corrective: Any maintenance activity that is not normal in the operation of the equipment and requ
35、ires access to the equipments interior. Such activities are expected to be performed by qualified personnel who are aware of the hazards involved. Such activities typically include locating causes of faulty performance, replacing defective components, and adjusting service controls. 3.6 maintenance,
36、 operational: Any maintenance activity, excluding corrective maintenance, that is intended to be performed by the operator and is required for the equipment to serve its intended purpose. Such operational maintenance activities typically include the correcting of zeroon a panel instrument, changing
37、charts, keeping of records, and adding ink. 3.7 make/break components: Components having contacts that can interrupt a circuit (even if the interruption is transient in nature). Examples of make/break components are relays, circuit breakers, servo potentiometers, adjustable resistors, switches, and
38、connectors. 3.8 maximum external capacitance (Ca): Maximum capacitance in a circuit that can be connected to the connection facilities of the apparatus. December 20043611 FM APPROVALS3 *AN ASTERISK FOLLOWING A WORD OR A SECTION NUMBER SIGNIFIES THAT EXPLANATORY MATERIAL APPEARS IN THE APPENDIX. -,-,
39、- 3.9 maximum external inductance (La): Maximum value of inductance in a circuit that can be connected to the connection facilities of the apparatus. 3.10 maximum external inductance to resistance ratio (La/Ra): Ratio of inductance (La) to resistance (Ra) of any external circuit that can be connecte
40、d to the connection facilities of the electrical apparatus without invalidating nonincendive field wiring circuits. 3.11 maximum input current (Imax): Maximum current (peak a.c. or d.c.) that can be applied to the connection facilities of the apparatus. 3.12 maximum input power (Pi): Maximum power i
41、n an external circuit that can be applied to the connection facilities of the apparatus. 3.13 maximum input voltage (Vmax): Maximum voltage (peak a.c. or d.c.) that can be applied to the connection facilities of the apparatus without invalidating the type of protection. 3.14 maximum internal capacit
42、ance (Ci): Total equivalent internal capacitance of the apparatus which is considered as appearing across the connection facilities of the apparatus. 3.15 maximum internal inductance (Li): Total equivalent internal inductance of the apparatus which is considered as appearing at the connection facili
43、ties of the apparatus. 3.16 maximum internal inductance to resistance ratio (Li/Ri): Ratio of inductance (Li) to resistance (Ri) that is considered as appearing at the external connection facilities of the electrical apparatus. 3.17 maximum output current (Isc): Maximum current (peak a.c. or d.c.) i
44、n a circuit that can be taken from the connection facilities of the associated nonincendive field wiring apparatus under normal operation. Normal operation includes opening, shorting, or grounding the field wiring. 3.18 maximum output current multiple channel apparatus (It): The maximum dc or peak a
45、c current that can be extracted from any combination of terminals of a multiple-channel associated nonincendive field wiring apparatus. 3.19 maximum output power (Po): Maximum electrical power in a circuit that can be taken from the apparatus. 3.20 maximum output voltage (Voc): Maximum output voltag
46、e (peak a.c. or d.c.) in a circuit that can appear under open-circuit conditions at the connection facilities of the associated nonincendive field wiring apparatus under normal operation. 3.21 maximum output voltage multiple channel apparatus (Vt): The maximum dc or peak ac open circuit voltage that
47、 can appear across any combination of terminals of a multiple-channel associated nonincendive field wiring apparatus. 3.22 nonincendive circuit*: A circuit, other than nonincendive field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment is not c
48、apable, under specified test con- ditions, of igniting the flammable gas-, vapor-, dust-air mixture, fibers or flyings. 3.23 nonincendive component: Construction of a component having contacts for making or breaking an incendive circuit and the contacting mechanism such that the component is incapab
49、le of igniting the specified flammable gas- or vapor-air dust-air mixture fibers or flyings. The housing of a nonincendive component is not intended to exclude the flammable atmosphere or contain an explosion. 3611December 2004 4FM APPROVALS *AN ASTERISK FOLLOWING A WORD OR A SECTION NUMBER SIGNIFIES THAT EXPLANATORY MATERIAL APPEARS IN THE APPENDIX. 3.24 nonincendive equipment: Equipment having electrical/electronic circuitry that is incapable, under normal operating condition