1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 15, 20161UL 4300Outline of Investigation for Electrically Heated Insulated Covers forCompressed Gas Cylinders for Use in Hazardous (Classified) LocationsIssue Number: 1December 15, 2016S
2、ummary of TopicsThis First issue of the Outline of Investigation for Electrically HeatedInsulated Covers for Compressed Gas Cylinders for Use in Hazardous(Classified) Locations, UL 4300, covers electrically heated insulatedcovers for compressed gas cylinders for use in Class I, Hazardous(Classified)
3、 Locations.ULs Outlines of Investigation are copyrighted by UL LLC. Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain t
4、he sole and exclusive property of ULLLC.COPYRIGHT 2016 UL LLCUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 15, 2016UL 43002No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PE
5、RMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42 Components 43 Units of Measurement .44 Undated References 5CONSTRUCTION5 General 5TESTING6 General 5MANUFACTURING AND PRODUCTION-LINE TESTS7 General 6RATINGS8 General 6MARKINGS9 General 6DECEMBER 15, 2016 UL 4300 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED
6、 FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements cover electrically heated insulated covers for compressed gas cylinders for usein Class I, Hazardous (Classified) Locations. The use is limited to high pressure cylinders containing onlymixtu
7、res of non-toxic flammable materials for laboratory or analyzer use in which some of the constituentsin the high pressure cylinder require heating above room temperature to ensure a uniform gas mixture.These products are intended for use in specialized commercial and industrial facilities, where saf
8、eoperations are addressed by responsible parties at the installation. These considerations include ambienttemperature control, assessment of the suitability of the tank and its contents to be used with the heaters,safety coordination associated with any releases due to elevated pressure, and similar
9、 aspects of safeusage. Refer to the US Code of Federal Regulations, Title 29, Subtitle B, Chapter XVII, Part 1910,Subpart H, Section 1910.101, Compressed Gases (general requirements), regarding the control and useof compressed gas cylinders.1.2 These requirements cover electrically heated insulated
10、covers intended for use in accordance withthe National Electrical Code, NFPA 70 and the Canadian Electrical Code, C22.1. They are also intendedfor use with Compressed Gas Association CGA P-1 by having a maximum limiting temperature of 125 F1.3 Covers are made in a variety of shapes and sizes for dir
11、ect application to a cylinder. A cover ofunusual size or odd shape is to be judged on its compliance with the requirements in this outline and onfurther examination and tests to determine its acceptability for the intended use and possible misuses.1.4 These requirements do not apply to units intende
12、d to be installed outdoors.2 Components2.1 Components shall comply with the requirements for that component.3 Units of Measurement3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.DECEMBER 15, 2016UL 43004UL COPYRIGHTED MATERIA
13、L NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Undated References4.1 Any undated reference to a code or standard appearing in the requirements of this outline ofinvestigations shall be interpreted as referring to the latest edition of and latest revisions to tha
14、t code orstandard.CONSTRUCTION5 General5.1 Electrically heated insulated covers for compressed gas cylinders for use in Hazardous (Classified)Locations as defined in the National Electrical Code (NEC) shall comply with the electrical equipmentexplosion protection standard(s) found in UL Category AAI
15、Z for Class I, Division 1 or Class I, Division 2or AANZ for Class I, Zone 1 or Class I, Zone 2, as is applicable.5.2 The heating equipment shall comply with UL 499. Refer to UL 499 sections 5 31.5.3 Electrically heated insulated covers for use in Class I, Division 1 or Class I, Zone 1 shall bedeterm
16、ined to be electrostatically dissipative in accordance with UL 1203, Test for Accumulation of StaticElectricity, section 147 and be bonded to the electrical earth ground.5.4 The controls for the electrical heating element(s) shall include a temperature limiting circuit to preventtemperatures from ex
17、ceeding the limit of 125F as required by Compressed Gas Association CGA P-1.The temperature control shall comply with UL 353.5.5 Heating element assemblies shall be secured to the surface being heated by means other than thethermal insulation.TESTING6 General6.1 Refer to UL 499 and UL 353.6.2 Refer
18、to the appropriate standard(s) found in AAIZ and AANZ as is applicable.DECEMBER 15, 2016 UL 4300 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMANUFACTURING AND PRODUCTION-LINE TESTS7 General7.1 Refer to UL 499 sections 50 51.RATINGS8 Gener
19、al8.1 Refer to UL 499 section 52.MARKINGS9 General9.1 The markings shall be located so that they are visible after installation of the heating blanket.9.2 In addition to the marking required for general-purpose equipment, the equipment shall be markedwith the following minimum information:1) The man
20、ufacturers name, trade name, or other descriptive marking by which theorganization responsible for the product may be identified.2) Designation of the hazardous location in which the heater is intended to be used forexample, “Class _, Group _.” In addition, a product for Division 2 only shall bear t
21、hewording: “Division 2,” for example, “Class ., Division 2, Group .”3) A catalog or designation number to specifically identify the heater.4) Maximum operating temperature or temperature Class based on the maximum temperatureattained in the temperature tests, identified as “Operating Temperature _,”
22、 or “OperatingTemperature Code _,”5) For a heater marked for use in an elevated ambient, the operating temperature or operatingtemperature code shall be based on operation in the elevated ambient for which the heater ismarked. A heater having a maximum external operating temperature of not more than
23、 100C(212F) need not be so marked.6) Ambient temperature rating, when greater than 40C or less than -25C.DECEMBER 15, 2016UL 43006UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULTable 9.1Temperature markingMaximum operating temperature Operati
24、ng temperature code or identification numberC (F)450 (842) T1300 (572) T2280 (536) T2A260 (500) T2B230 (446) T2C215 (419) T2D200 (392) T3180 (356) T3A165 (329) T3B160 (320) T3C135 (275) T4120 (248) T4A100 (212) T585 (185) T6DECEMBER 15, 2016 UL 4300 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 15, 2016UL 43008No Text on This Page
