UL-2267-BULLETINS-2005.pdf
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1、FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION Subject 2267 October 21, 2005 SUMMARY OF TOPICS The following is being proposed: The First Edition of the Standard for Fuel Cell Power Systems for Installation in Industrial Electric Trucks, UL 2267 STP BALLOTS AND ALL COMMENTS DUE: Decem
2、ber 5, 2005 The First Edition of the Standard for Fuel Cell Power Systems for Installation in Industrial Electric Trucks, UL 2267 RATIONALE The First Edition of the Standard Fuel Cell Power Systems for Installation in Industrial Electric Trucks, UL 2267, was proposed through CSDS on July 1, 2005. Th
3、e proposed standard has been revised since then as a result of the comments and suggested revisions received from STP members and other interested parties. For your convenience in review of this draft standard, the proposed additions to the previously proposed requirements are shown underlined and p
4、roposed deletions are shown lined-out. PROPOSAL Copyright Underwriters Laboratories Inc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/20/2006 05:38:21 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL
5、 UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION INTRODUCTION 1 Scope 1.1 These requirements cover fuel cell power systems intended to be installed in Type E, EE, and ES industrial trucks used in locations as defi ned in the Standard for Powered Industrial Trucks Including Type Designations, Areas
6、of Use, Conversions, Maintenance, and Operation, NFPA 505, and the National Electrical Code, ANSI/NFPA 70. 1.2 The fuel cell power systems covered by this standard are anticipated for use as described in the Safety Standard for Low Lift and High Lift Trucks, ANSI/ASMEITSDF B56.1; the Safety Standard
7、 for Guided Industrial Vehicles and Automated Functions of Manned Industrial Vehicles, ANSI/ASMEITSDF B56.5; the Safety Standard for Rough Terrain Forklift Trucks, ANSI/ASMEITSDF B56.6; the Safety Standard for Industrial Crane Trucks, ANSI/ASMEITSDF B56.7; the Safety Standard for Personnel and Burde
8、n Carriers, ANSI/ASME ASMEITSDF B56.8; the Safety Standard for Operator Controlled Industrial Tow Tractors, ANSI/ASMEITSDF B56.9; and the Safety Standard for Manually Propelled High Lift Industrial Trucks, ANSI/ASMEITSDF B56.10, as applicable to the intended truck. 1.3 These requirements cover fuel
9、cell power systems that supply a maximum of 150 V. 1.4 This standard covers fuel cell power systems that are intended to be self-contained or integrated with industrial trucks to supply electrical power, see 2.9 (a) and (b). These requirements cover the use of designs that are fueled by hydrogen gas
10、. 2 Glossary 2.1 For the purpose of this standard, the following defi nitions apply. 2.2 BONDING The permanent joining of metallic parts to form a positive electrically conductive path that provides electrical continuity between dead metal parts and is capable of conducting any fault current that ma
11、y occur. 2.3 BURST PRESSURE The minimum pressure, which must be met during a burst test. This is typically a minimum of: a) 2.25 times the service pressure for some composite cylinders, or b) The pressure needed to determine the required stress ratios. NOTE The minimum burst pressure is typically 4
12、times the service pressure. 2.3 BURST PRESSURE The minimum pressure which must be met during a burst test. The burst pressure is needed to determine the required stress ratios and is typically 4 times the service pressure. 2.4 CIRCUIT, HIGH-VOLTAGE A circuit involving a potential greater than 42.4 V
13、 peak (30 Vrms) or 60 Vdc. 2.5 CIRCUIT, LOW-VOLTAGE A circuit involving a peak open-circuit potential of not more than 42.4 V (30 Vrms) or 60 Vdc supplied by a battery, a fuel cell, a Class 2 transformer, or by a combination of a transformer and a fi xed impedance that as a unit, complies with all p
14、erformance requirements for a Class 2 transformer. A circuit derived by connecting a resistance in series with a voltage supply circuit as a means of limiting the voltage and current, is not considered to be a low-voltage circuit. OCTOBER 21, 2005SUBJECT 2267-2- Copyright Underwriters Laboratories I
15、nc. Provided by IHS under license with ULLicensee=North Carolina State University/5618801100 Not for Resale, 10/20/2006 05:38:21 MDTNo reproduction or networking permitted without license from IHS -,-,- FOR INTERNAL UL OR CSDS USE ONLY NOT FOR OUTSIDE DISTRIBUTION 2.6 DILUTION BOUNDARY The extent of
16、 a fl ammable area or zone created by a limited internal release of fl ammable gas or vapor and controlled by mechanical ventilation or other effective means as outlined by Electrical Apparatus for Explosive Gas Atmospheres Part-10: Classifi cation of Hazardous Areas, IEC 60079-10. 2.7 ELECTROSTATIC
17、 DISCHARGE (ESD) Discharge created by static electricity. 2.8 FILL PRESSURE, MAXIMUM The maximum pressure attained during the fi lling process. Fill pressure varies according to the gas temperature in the container, which is dependent on the fi lling parameters and the ambient conditions. 2.9 FUEL C
18、ELL POWER SYSTEM An assembly of components and parts that together electrochemically converts fuel and oxidant to electrical current. The fuel cell power system for use with industrial trucks will be in one of the following forms: a) Self-contained system A complete system incorporated into its own
19、housing that is intended to replace or combine with a battery system to power an industrial truck. b) Integrated system A complete system of fuel cell components and parts that are incorporated into the industrial truck with the various parts of the system potentially distributed throughout the truc
20、k. 2.10 HAZARDOUS (CLASSIFIED) AREAS Any work area or space where combustible dust, ignitable fi bers, or fl ammable, volatile liquids gases, vapors or mixtures are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures as defi ned by the National Electrical
21、 Code, ANSI/NFPA 70, or by Electrical Apparatus for Explosive Gas Atmospheres Part-10: Classifi cation of Hazardous Areas, IEC 60079-10. 2.11 LIMITED ENERGY CIRCUIT A circuit where the available power is less than 240 VA for a duration of 60 s or more, or a stored energy level of 20 J or less at a p
22、otential of 2 V or less. 2.11 LIMITED POWER CIRCUIT A circuit supplied from a source whose open circuit voltage is less than or equal to 60 Vdc and whose maximum current and power after 60 s of operation comply with the values outlined in Tables 32.1 and 32.2. Limited power circuits are considered e
23、quivalent to NEC Class 2 circuits as outlined in the National Electrical Code, ANSI/NFPA 70. 2.12 LOWER EXPLOSION LIMIT (LEL) The lowest volume percentage of a gas in air that will explode. 2.13 LOWER FLAMMABILITY LIMIT (LFL) The lowest volume percentage of a gas in air that will ignite. 2.14 MAXIMU
24、M ALLOWABLE WORKING PRESSURE (MAWP) The maximum gauge pressure that the system can obtain based upon abnormal operation and the fully open operating pressure of the safety pressure relief devices. 2.15 MAXIMUM CONTINUOUS LOAD RATING Maximum continuous power that can be sustained by the fuel cell sys
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