1、2595532 0078207 243 UL1244 ADOPTION NOTICE UL1244, “Electrical and Electronic Measuring and Test Equipment,“ was adopted on October 3, 1994, for use by the Department of Defense (DoD). Proposed changes by DoD activities must be submitted to the DoD Adopting Activity: Commander, Defense Personnel Sup
2、port Center, ATTN: DPSC-MSE, 2800 South 20th Street, Philadelphia, PA 19145. DoD activities may obtain copies of this standard from the Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111- 5094. The private sector and other Government agencies may purchase co
3、pies from the Underwriters Laboratories, 333 Pfingsten Road, Northbrook, IL 60062. Custodians: Army - MI Navy - SH Air Force - 99 Adopting Activity DLA - DM FSC 6625 DISTmUTION STAmMENT A. Approved for public release; distribution is unlimited. UL 1244 ISBN 0-7629-0602-2 Electrical and Electronic Me
4、asuring and Testing Equipment OCTOBER 30,2000 - UL 1244 trl Underwriters Laboratories Inc. (UL) 333 Pfingsten Road Northbrook. IL 60062-2096 UL Standard for Safety for Electrical and Electronic Measuring and Testing Equipment, UL 1244 Fourth Edition , Dated October 30, 2000 Announcement Bulletin(s):
5、 This Standard contains the announcement bulletin(s) dated June 5, 1996 and March 6, 1998. The announcement bulletin is located at the end of the Standard (after the adoption bulletin(s). As indicated on the title page (pagel), this UL Standard for Safety has been adopted by the Department of Defens
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20、ments in this Standard are now in effect, except for those paragraphs, sections, tables, figures, and/or other elements of the Standard having future effective dates as indicated in the note following the affected item. The prior text for requirements that have been revised and that have a future ef
21、fective date are located after the Standard, and are preceded by a ”SUPERSEDED REQUIREMENTS” notice. New product submittals made prior to a specified future effective date will be judged under all of the requirements in this Standard including those requirements with a specified future effective dat
22、e, unless the applicant specifically requests that the product be judged under the current requirements. However, if the applicant elects this option, it should be noted that compliance with all the requirements in this Standard will be required as a condition of continued Recognition and Follow-Up
23、Services after the effective date, and understanding of this should be signified in writing. Copyright O 2000 Underwriters Laboratories Inc. This Standard consists of pages dated as shown in the following checklist: Page Date 1-106 October30,2000 Al-A6 October30,2000 Bl-B20 . October30,2000 OCTOBER
24、30,2000 1 UL 1244 Standard for Electrical and Electronic Measuring and Testing Equipment First Edition - July, 1978 Second Edition - July, 1980 Third Edition - November, 1993 Fourth Edition October 30, 2000 An effective date included as a note immediately following certain requirements is one establ
25、ished by Underwriters Laboratories Inc. The Department of Defense (DoD) has adopted UL 1244 on July 4, 1994. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Revisions of this Standard will be made by issuing revised or additional pages bearing
26、 their date of issue. A UL Standard is current only if it incorporates the most recently adopted revisions, all of which are itemized on the transmittal notice that accompanies the latest set of revised requirements. ISBN 0-7629-0602-2 COPYRIGHT 1978, 2000 UNDERWRITERS LABORATORIES INC. 2 ELECTRICAL
27、 AND ELECTRONIC MEASURING AND TESTING EQUIPMENT - UL 1244 OCTOBER 30,2000 No Text on This Page OCTOBER 30. 2000 ELECTRICAL AND ELECTRONIC MEASURING AND TESTING EQUIPMENT . UL 1244 3 CONTENTS FOREWORD 6 1 General 7 1.1 Scope . 7 2 Definitions 1 0 3 General Information 14 3.1 Purposes of this standard
28、 14 3.2 Compliance . 14 3.3 Components 14 3.4 Units of measurement 14 4 General Requirements 15 5 General Type-Test Requirements 16 5.1 Conductoftests . 16 5.2 Reference test conditions (reference conditions for test purposes) . 17 5.3 Fault conditions . 19 6 Marking . 19 6.1 General requirements 19
29、 6.2 Equipment-identification markings . 20 6.3 Equipment-rating markings . 21 6.4 Warning and caution markings 24 6.5 Operator-control and terminal markings 27 6.6 On/off switch 29 6.7 Field wiring connection temperature markings . 30 6.8 Double insulation marking 30 7 Equipment Emanations . 31 7.1
30、 Ionizing radiation 31 8 Heating . 32 8.1 General 32 8.2 Temperature limits . 32 8.3 Polymeric-enclosure and insulating-material thermal conditioning 34 9 Protection From Effects of Implosion and Explosion 36 9.1 Implosion protection . 36 9.2 Explosion protection . 38 10 Protection From Electric Sho
31、ck . 40 10.1 Accessible parts . 40 10.2 Electricshock 41 10.3 Exterior of equipment . 43 10.4 Construction requirements . 44 10.5 Protective grounding 45 10.6 Permanently connected equipment . 48 10.7 Spacing . 50 10.8 Polarization of supply circuits 51 10.9 Humidity conditioning . 53 10.1 O Leakage
32、 current for cord-connected and self-powered equipment 54 10.1 1 Dielectric voltage-withstand tests 65 11 Testing Under Fault Conditions . 70 1 1.1 Equipment preparation 70 1 1.2 Compliance tests . 71 11.3 Faultconditions 72 12 Mechanical Strength, Stability, and Injury to Persons 76 4 ELECTRICAL AN
33、D ELECTRONIC MEASURING AND TESTING EQUIPMENT . UL 1244 OCTOBER 30. 2000 12.1 Mechanical strength 76 12.2 Handle loading test . 81 12.3 Tip-stability test 81 12.4 Sharpedges . 82 13 Protection From Fire 82 13.1 Enclosure materials . 82 13.2 Insulating materials . 82 13.3 Printed-wiring boards . 82 14
34、 Component Requirements and Applications 85 14.1 Motors 85 14.2 Supply-circuit switches 85 14.3 Safety switches 86 14.4 Interlock mechanism 86 14.5 Protective devices 87 14.6 Batteries 87 14.7 Transformers 88 14.8 Measuring or testing-probe assembly . 88 14.9 Range and function switches 88 14.1 O Co
35、nductive (metallic) coatings and shields . 89 15 Measuring- or Testing-Probe Assembly 89 15.1 Markings 89 15.2 Insulation 90 15.3 Dielectric voltage-withstand tests . 92 15.4 Thermal conditioning 92 15.5 Mechanical strength 93 16 Subdivision of Circuits Groups 94 16.1 Limited-voltage circuit . 94 16
36、.2 Limited-power circuit 95 17 Terminal Devices . 97 17.1 Operator-accessible-terminals mounting . 97 17.2 Supply circuit connectors 97 18 External Cords . 98 18.1 Attachment 98 18.2 Flexible power-supply cords . 99 18.3 Interconnection cables . 100 19 Equipment Information and Instructions 100 19.1
37、 Separation of information . 100 19.2 Operating instructions . 101 19.3 Installation instructions . 102 20 Double Insulated Equipment 102 20.1 Construction requirements 102 20.2 Protective grounding terminal . 103 20.3 Spacing 104 20.4 Dielectric voltage withstand tests in double insulated equipment
38、 104 20.5 Insulation resistance test . 106 APPENDIXA-SYMBOLS Al APPENDIX B - MANUFACTURING AND PRODUCTION TESTS (ROUTINE TESTS) . B1 OCTOBER 30,2000 ELECTRICAL AND ELECTRONIC MEASURING AND TESTING EQUIPMENT - UL 1244 5 No Text on This Page 6 ELECTRICAL AND ELECTRONIC MEASURING AND TESTING EQUIPMENT
39、- UL 1244 OCTOBER 30,2000 FOREWORD A. This Standard contains basic requirements for products covered by Underwriters Laboratories Inc. (UL) under its Follow-Up Service for this category within the limitations given below and in the Scope section of this Standard. These requirements are based upon so
40、und engineering principles, research, records of tests and field experience, and an appreciation of the problems of manufacture, installation, and use derived from consultation with and information obtained from manufacturers, users, inspection authorities, and others having specialized experience.
41、They are subject to revision as further experience and investigation may show is necessary or desirable. B. The observance of the requirements of this Standard by a manufacturer is one of the conditions of the continued coverage of the manufacturers product. C. A product which complies with the text
42、 of this Standard will not necessarily be judged to comply with the Standard if, when examined and tested, it is found to have other features which impair the level of safety contemplated by these requirements. D. A product employing materials or having forms of construction which conflict with spec
43、ific requirements of the Standard cannot be judged to comply with the Standard. A product employing materials or having forms of construction not addressed by this Standard may be examined and tested according to the intent of the requirements and, if found to meet the intent of this Standard, may b
44、e judged to comply with the Standard. E. UL, in performing its functions in accordance with its objectives, does not assume or undertake to discharge any responsibility of the manufacturer or any other party. The opinions and findings of UL represent its professional judgment given with due consider
45、ation to the necessary limitations of practical operation and state of the art at the time the Standard is processed. UL shall not be responsible to anyone for the use of or reliance upon this Standard by anyone. UL shall not incur any obligation or liability for damages, including consequential dam
46、ages, arising out of or in connection with the use, interpretation of, or reliance upon this Standard. F. Many tests required by the Standards of UL are inherently hazardous and adequate safeguards for personnel and property shall be employed in conducting such tests. OCTOBER 30,2000 ELECTRICAL AND
47、ELECTRONIC MEASURING AND TESTING EQUIPMENT - UL 1244 7 1 General 1.1 Scope 1.1.1 Electrical or electronic measuring or testing equipment This standard applies to electrical, electronic, or electromechanical measuring or testing equipment designed: to -measure, or -observe, and indicate quantities of
48、 -electrical, or -electronic phenomena, or I I I I I Measuring Equipment I I to supply I -electrical, or I Testing Equipment -electronic I quantities for measuring purposes. I (Inclusion of equipment that measures or indicates electrical analogs of other phenomena is under consideration.) 1.1.2 Auxi
49、liary or accessory equipment This standard also applies to auxiliary equipment and accessories rated for use with electrical, electronic, or electromechanical measuring and testing equipment wherein auxiliary and accessory equipment is separate and does not itself perform the desired function but is used in addition to or as a supplement to equipment according to 1.1 .l. 1.1.3 Equipment covered Electrical, electronic, and electromechanical measuring and testing equipment includes, but is not necessarily restricted to: a) inedicating and recording measuring equipment, b) electrical a
