UL 574-2003 UL Standard for Safety Electric Oil Heaters (Eighth Edition Reprint with Revisions Through and Including August 13 2014)《电油加热器》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 574 Electric Oil HeatersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCT

2、ION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Electric Oil Heaters, UL 574 Eighth Edition, Dated August 14, 2003 Summary of Topics These revisions to UL 574 are being issued to add overload protection in 9.2 9.4, and to the markings section in 26.14 and 26.15. Text that h

3、as been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. Changes in requirements are marked with a vertical line in the margin and are followed by an effective date note indicating the date of publication or the date on which the cha

4、nged requirement becomes effective. The new requirements are substantially in accordance with Proposal(s) on this subject dated February 7, 2014. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mec

5、hanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for

6、 any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such d

7、amage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage

8、, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. The requirements in this Standard are now in effect, except for those paragraphs, sections, tables, gures,

9、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 effective date are located after the Standard, and are preceded by a SUPERSEDED REQUIREMENTS notice.

10、 AUGUST 13, 2014 UL 574 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 13, 2014 UL 574 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 14, 2

11、003 (Title Page Reprinted: August 13, 2014) 1 UL 574 Standard for Electric Oil Heaters First Edition September, 1959 Second Edition August, 1968 Third Edition June, 1973 Fourth Edition December, 1973 Fifth Edition April, 1980 Sixth Edition February, 1991 Seventh Edition June, 1996 Eighth Edition Aug

12、ust 14, 2003 This ANSI/UL Standard for Safety consists of the Eighth edition including revisions through August 13, 2014. The most recent designation of ANSI/UL 574 as an American National Standard (ANSI) occurred on August 13, 2014. ANSI approval for a standard does not include the Cover Page, Tran

13、smittal Pages, Title Page, or effective date information. The Department of Defense (DoD) has adopted UL 574 on April 7, 1994. The publication of revised pages or a new edition of this Standard will not invalidate the DoD adoption. Comments or proposals for revisions on any part of the Standard may

14、be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of UL

15、s Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2014 UNDERWRITERS LABORATORIES INC. ANSI/UL 574-2014UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM U

16、L AUGUST 13, 2014 ELECTRIC OIL HEATERS - UL 574 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .7 2 General 7 2.1 Components .7 2.2 Units of measurement .7 2.3 Undated references .8 CONSTR

17、UCTION 3 Assembly 8 4 Materials .9 5 Thermal Insulation .10 6 Supply Connections 10 7 Internal Wiring .11 7.1 General 11 7.2 Bonding for grounding .12 8 Electrical Insulation 13 9 Overload Protection 14 10 Lampholders .14 11 Switches .14A 12 Controls .15 13 Mounting of Components 16 SPACINGS 14 Gene

18、ral 16 PERFORMANCE 15 Power Input Test .18 16 Insulation Resistance Test .18 17 Temperature Tests 18 17.1 Normal operation test .18 17.2 Abnormal operation test .20 18 Volume Change Test 21 19 10-Day Moist Ammonia-Air Stress Cracking Test .21 20 Dielectric Voltage Withstand Test .22 21 Insulation Re

19、sistance and Dielectric Voltage Withstand Test .22 22 Leakage and Hydrostatic Strength Test 22 MANUFACTURING AND PRODUCTION TESTS 23 General 23 24 Leakage Tests .23 25 Production Line Dielectric Voltage Withstand Test 23 AUGUST 13, 2014 ELECTRIC OIL HEATERS - UL 574 3UL COPYRIGHTED MATERIAL NOT AUTH

20、ORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARKING 26 General 24 Appendix A Standards for ComponentsA1 AUGUST 14, 2003 ELECTRIC OIL HEATERS - UL 574 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 14,

21、2003 ELECTRIC OIL HEATERS - UL 574 5 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL This page intentionally left blank. AUGUST 27, 2004 ELECTRIC OIL HEATERS - UL 574 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE

22、PRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover electric oil heaters for use with Nos. 5 and 6 fuel oil as dened in Specications for Fuel Oils, ASTM D396, or other oils such as heat transfer oils. Electric oil heaters are to be used in ordinary

23、 locations and installed in accordance with the National Electrical Code, NFPA 70. 1.1 revised August 14, 2003 1.2 These requirements do not cover electric oil heaters rated at more than 600 volts. 2 General 2.1 Components 2.1.1 Except as indicated in 2.1.2, a component of a product covered by this

24、standard shall comply with the requirements for that component. See Appendix A for a list of standards covering components used in the products covered by this standard. 2.1.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required i

25、n the application of the component in the product covered by this standard, or b) Is superseded by a requirement in this standard. 2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.1.4 Specic components are incomplete in construction feat

26、ures or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.2 Units of measurement 2.2.1 Values stated without parentheses are th

27、e requirement. Values in parentheses are explanatory or approximate information. AUGUST 13, 2014 ELECTRIC OIL HEATERS - UL 574 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.3 Undated references 2.3.1 Any undated reference to a code or s

28、tandard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONSTRUCTION 3 Assembly 3.1 The construction of an oil heater shall be such that parts can be reassembled in the intended manner after being dismantled to the exte

29、nt needed for servicing. 3.2 The location and mounting of any integral controls shall be such as to protect these components from damage in service and when the oil heater is dismantled to the extent needed for servicing. 3.3 An automatic mechanism shall be provided with an enclosure to reduce the r

30、isk of unintentional obstruction of moving parts. 3.4 A brazing material for joining liquid-conning parts shall have a melting point (solidus temperature) not less than 1000F (538C). 3.5 Screws and nuts used to attach operating parts to movable members shall be upset or otherwise locked to prevent l

31、oosening under the conditions of actual use. 3.6 Uninsulated high-voltage live parts shall be provided with an enclosure. 3.7 Unreinforced at surfaces of an electrical enclosure of cast metal shall be not less than 1/8 inch (3.2 mm) thick, except that malleable iron may be not less than 3/32 inch (2

32、.4 mm) thick and die-cast metal may not be less than 5/64 inch (2.0 mm) thick. 3.8 To conform to 3.7, corresponding thickness of not less than 3/32, 1/16, and 3/64 inch (2.4, 1.6, and 1.2 mm, respectively) may be acceptable when the surface under consideration is curved, ribbed, or otherwise reinfor

33、ced, or when the shape and/or size of the surface is such that equivalent mechanical strength to that provided by the basic thickness is obtained. 3.9 An electrical enclosure of sheet metal is judged with respect to its size, shape, thickness of metal, and its suitability, considering the intended u

34、se of the complete oil heater. Sheet steel having a minimum thickness of less than 0.026 inch (0.66 mm) when uncoated or 0.029 inch (0.74 mm) when galvanized, or nonferrous sheet metal having a minimum thickness of less than 0.036 inch (0.91 mm), shall not be used except for small areas or for surfa

35、ces which are curved or otherwise reinforced to provide mechanical strength equivalent to that provided by the basic thickness. 3.10 Sheet metal to which conduit or metal-clad cable connection is to be made shall be of such thickness or shall be so formed or reinforced that it will have a stiffness

36、not less than that of an uncoated at steel sheet having an average thickness not less than 0.032 inch (0.81 mm). AUGUST 14, 2003 ELECTRIC OIL HEATERS - UL 574 8UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 3.11 Pipe threads shall be in acc

37、ordance with the Standard for Pipe Threads, General Purpose, ANSI/ASME B1.20.1. An assembly for attachment to pipe by threaded connection shall have a section intended to serve as a wrench grip. 3.12 An assembly for attachment to pipe larger than 3 inch (76.2 mm) nominal pipe size (Welded and Seamle

38、ss Wrought Steel Pipe, ANSI B36.10M-2000) shall be provided with standard anged-pipe connections. Flanges shall conform to the appropriate American National Standard for Pipe Flanges and Flanged Fittings covering the material from which they are made. 3.13 A ferrule, bushing, or other functional par

39、t of a heater having a threaded connection for attachment to pipe shall, by inherent design, be prevented from loosening or becoming dislodged as the result of the turning effect of assembly or dismantling pipe. 3.14 A plug, cap, or other part threaded into or on a body shall engage with at least fo

40、ur full threads. 3.15 A spring shall be guided and arranged to prevent binding, buckling, or other interference with its free movement. When necessary, ends of a spring shall be closed and squared. 4 Materials 4.1 A part in contact with oil shall be resistant to the action of such liquid. 4.2 A mate

41、rial, except a seal ring or gasket, shall have a melting point (solidus temperature) of not less than 950F (510C) and a tensile strength not less than 10,000 pounds per square inch (psi) (6.9 MPa) at 400F (204C). 4.3 A synthetic rubber part in contact with oil shall not show excessive volume change,

42、 when considered on the basis of its intended function, following immersion for 70 hours in IRM oil No. 903 (Test Method for Rubber Property Effects of Liquid, ASTM D471-1998). 4.3 revised August 14, 2003 4.4 A change in volume of not more than 25 percent swelling or 1 percent shrinkage is considere

43、d as indicating compliance with 4.3. See Volume Change Test, Section 18. 4.5 A part made of synthetic rubber which may be affected by aging shall not crack or show visible evidence of deterioration following air oven aging. The test time and temperature should be determined using the oven aging tabl

44、e in the Standard for Gaskets and Seals, UL 157, based on a service temperature as measured during the Temperature Test, Section 17. 4.5 revised August 14, 2003 4.6 An automatically actuated part of an oil heater shall be made of metal resistant to corrosion or of metal protected by a corrosion resi

45、stant nish that will not be impaired by exposure, wear, and the like, during the expected service life of the heater. 4.7 Any sheath, capillary, well, or other part shall be resistant to atmospheric corrosion and attack by the oil it may normally contact in service when failure of the part may permi

46、t external leakage or result in hazardous operation of the heater. AUGUST 14, 2003 ELECTRIC OIL HEATERS - UL 574 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.8 Uncoated ordinary-ferrous materials are considered adequate for the precedi

47、ng when made of sheet metal not less than 0.053 inch (1.35 mm) thick or made of cast metal not less than 1/8 inch (3.2 mm) thick. Brass alloys in sheet form are not considered resistant to the corrosive effects of fuel oils. 4.9 Cadmium plating shall have a thickness of not less than 0.0003 inch (0.

48、008 mm) and zinc plating shall have a thickness of not less than 0.0005 inch (0.013 mm), except on parts where threads constitute the major portion of the area, in which case the thickness of the cadmium or zinc plating shall be not less than 0.00015 inch (0.0038 mm). 4.10 A part made of drawn brass

49、 or machined from brass rod shall be capable of withstanding, without cracking, the 10-Day Moist Ammonia-Air Stress Cracking Test, Section 19. 4.11 If warping of a casting can affect the tightness of liquid-conning joints or the necessary t of parts, the casting shall be stress-relieved to reduce the possibility of warping to a minimum. 4.12 For at anges, a plant-ber gasket shall be not more than 1/32 inch (0.8 mm) thick. Synthetic rubber gasket shall have a thickness of not less than 1/16 in