1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 174 Household Electric Storage Tank Water HeatersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORI
2、ZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Household Electric Storage Tank Water Heaters, UL 174 Eleventh Edition, Dated April 29, 2004 Summary of Topics This revision of ANSI/UL 174 includes the following changes in requirements: Editorial rev
3、ision at SA6.1 to correct the reference to Temperature-Limiting Controls. Text that has 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 a
4、n effective date note indicating the date of publication or the date on which the changed requirement becomes effective. 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, mechanical photocopying, rec
5、ording, 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 any special, incidental,
6、 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 damage. In no event shall
7、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, claim, or judgment (inc
8、luding 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, and/or other elements of
9、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. APRIL 10, 2015 UL 174 tr
10、1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 10, 2015 UL 174 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 29, 2004 (Title Page Reprinted: A
11、pril 10, 2015) 1 UL 174 Standard for Household Electric Storage Tank Water Heaters First Edition November, 1948 Second Edition June, 1956 Third Edition May, 1970 Fourth Edition June, 1972 Fifth Edition September, 1977 Sixth Edition May, 1979 Seventh Edition April, 1983 Eighth Edition November, 1989
12、Ninth Edition June, 1995 Tenth Edition February, 1996 Eleventh Edition April 29, 2004 This ANSI/UL Standard for Safety consists of the Eleventh Edition including revisions through April 10, 2015. The most recent designation of ANSI/UL 174 as an American National Standard (ANSI) occurred on September
13、 21, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Li
14、ne 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 ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the
15、 sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 174-2012UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JULY 15, 2011 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 2 No Text on This PageUL C
16、OPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Components 6 3 Units of Measurement .7 4 Undated References 7 5 Glossary .7 CONSTRUCTION 6 Frame, Enclosures, and Outer Jacket .8 6.1 General .8 6.2 Enclosures 8
17、6.3 Outer jacket .9 7 Mechanical Assembly 11 8 Accessibility of Live Parts .12 9 Wetting of Live Parts .13 10 Corrosion Resistance .13 10.1 General .13 10.2 Storage tanks 13 11 Electrical Supply Connections Permanent Connection .13 11.1 General .13 11.2 Field-wiring compartment 14 11.3 Field-wiring
18、terminals and leads 15 12 Electrical Supply Connections Cord Connection .16A 12.1 Power supply cords .16A 12.2 Bushings .16B 12.3 Strain relief .16B 13 Electrical Spacings 16B 13.1 General 16B 13.2 Reduction of spacings due to turning or shifting 19 14 Grounding .19 14.1 General .19 14.2 Conductor i
19、dentication .22 15 Reduction of Risk of Injury .22 15.1 Sharp edges .22 15.2 Stability .22 15.3 Surface temperatures .22A 16 Overcurrent Protection .22A 17 Materials in Contact with Water .22B 17.1 General 22B 17.2 Dip tubes 22B 17.3 Polymeric storage tank liner 22B 18 Current-Carrying Parts .22B 19
20、 Internal Wiring 23 20 Electrical Insulation .24 21 Thermal Insulation 24 21.1 General .24 21.2 Polymeric foam 26 22 Heating Elements .27 JULY 15, 2011 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERM
21、ISSION FROM UL 22.1 General .27 22.2 Sheathed elements .27 23 Temperature-Regulating Controls .27 24 Temperature-Limiting Controls 28 25 Storage Tank .28B PERFORMANCE 26 Power Input Test .29 27 Insulation Resistance Test .29 28 Temperature Test .29 28.1 General .29 28.2 Maximum load .30 28.3 Surface
22、 temperatures .32 28.4 Dry operation 32 29 Water Temperature Test .33 30 Dielectric Voltage-Withstand Test .33 31 Mounting Test of Surface-Mounted Temperature Controls .34 31.1 Horizontal pull .34 31.2 Supply lead pull 36 32 Barrier Pull Tests .36 33 Water Capacity Test 36 34 Grounding-Circuit Resis
23、tance Measurement Test .36 35 Storage Tank Hydrostatic Pressure Test .37 36 Nonmetallic Dip Tube Tests 37 36.1 Deformation of weight loss 37 36.2 Resistance to crushing 38 36.3 Collapse 40 37 Strain Relief Test .41 38 Push Back Relief Test .41 39 Electrical Disturbance Test of Foam Thermal Insulatio
24、n .41 40 Leakage Current Test .42 41 Enclosure Strength Test .45 42 Permanence of Markings 45 MANUFACTURING AND PRODUCTION TEST 43 Production Line Dielectric Voltage-Withstand Test 46 RATINGS 44 Electrical .48 45 Tank Pressure and Capacity .48 MARKINGS 46 Identication .48 47 Ratings 49 48 Warning No
25、tices 50 49 Informational Markings 53 APRIL 22, 2009 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INSTRUCTIONS 50 General 55 51 Safety Instructions 56 SUPPLEMENT SA - ELECTRIC STORAG
26、E TANK WATER HEATERS FOR MARINE USE INTRODUCTION SA1 Scope SA1 SA2 Glossary SA1 CONSTRUCTION SA3 General SA2 SA4 Electrical Supply Connections .SA2 SA5 Internal Wiring .SA3 SA6 Temperature-Limiting Controls SA3 PERFORMANCE SA7 Vibration Test .SA3 SA8 Shock Test .SA4 SA9 Ignition Protection Test .SA4
27、 SA10 Strain Relief Test .SA4 MARKING SA11 Identication .SA5 SUPPLEMENT SB - SAFETY OF SMART ENABLED HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS SB1 Scope SB1 SB2 General SB2 SB3 Functional Safety SB4 SB4 Resistance to Electro Magnetic Phenomena (Immunity) SB6 SB5 Markings and Instructions .SB6 AP
28、PENDIX A SEPTEMBER 21, 2012 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover household electric storage tank and small capacity storage
29、tank water heaters rated no more than 600 volts and 12 kilowatts to be installed in accordance with the National Electrical Code, NFPA 70, and with model plumbing and mechanical codes. 1.2 These requirements do not cover immersed electrode, side arm, booster, instantaneous or immersion type water he
30、aters or water heating portions of water dispensing appliances. These requirements do not cover water heaters with a tank capacity of less than 1 gallon (3.8 L) or more than 120 gallons (454 L). 1.3 Electric booster water heaters, electric commercial storage tank water heaters, and remote control as
31、semblies for such heaters, rated 600 volts or less are not covered by this standard. They are covered in the Standard for Electric Booster and Commercial Storage Tank Water Heaters, UL 1453. 1.4 Permanently installed electric water heaters, rated 600 volts or less, for heating the water supplied thr
32、ough plumbing to separately heated public or private pools or tubs, in which swimming, wading, bathing, or partial or total immersion of persons, is to be involved are not covered by this standard. They are covered in the Standard for Electric Water Heaters for Pools and Tubs, UL 1261. 1.5 Water hea
33、ters rated 600 volts or less with a tank capacity of less than 1 gallon (3.8 liters) are not covered by this standard. They are covered under the Standard for Electric Heating Appliances, UL 499. 1.6 A water heater intended for use in a hazardous location is to be judged on the basis of its complian
34、ce with these requirements; however, further examination and testing shall be conducted to determine whether it is acceptable for the intended use. 2 Components 2.1 Except as indicated in this clause, a component of a product covered by this standard shall comply with the requirements for that compo
35、nent. See the individual sections of this standard for component requirements. 2.1 revised July 15, 2011 2.2 A component is not required to comply with a specic requirement that: a) Involves a feature or characteristic not required in the application of the component in the product covered by this s
36、tandard, or b) Is superseded by a requirement in this standard. 2.3 A component shall be used in accordance with its rating established for the intended conditions of use. 2.4 Specic components are incomplete in construction features or restricted in performance capabilities. Such components are int
37、ended for use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. JULY 15, 2011 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTR
38、IBUTION WITHOUT PERMISSION FROM UL 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 3.2 Unless otherwise stated, all electrical measurements are in root-mean-square units (rms). 4 Undated References 4.
39、1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Glossary 5.1 For the purposes of these requirements, the following denitions shall apply. 5.2 DIP TUBE A metallic or other
40、tube attached to the inlet of a storage tank for the purpose of carrying cold inlet water to the bottom of the tank. 5.3 ENCLOSURE The part of an electric water heater that surrounds insulated and uninsulated current-carrying live parts and that is intended to contain a re resulting from an electric
41、al fault. 5.3.1 FRAME A structure of angle or channel or a folded rigid section of sheet metal that is rigidly attached to and has essentially the same outside dimensions as the enclosure surface and that has sufficient torsional rigidity to resist the bending moments which may be applied via the en
42、closure surface when it is deected. 5.3.1 added July 15, 2011 5.4 HEAT TRAP A device that is capable of being integrally assembled or independently attached to the hot water connection of a water heater such that a portion of this device develops a cold water seal to reduce the natural convection an
43、d resultant heat loss from the hot water stored in the water heater. 5.5 INLET WATER DEFLECTOR (DIFFUSER) A component, usually nonmetallic, attached to the inlet tube or pipe when the inlet is at or near the bottom of the water heater tank, that serves to spread the cold water uniformly on a horizon
44、tal plane to aid in mixing of the hot and cold water. 5.5.1 OPERATING CONTROL A control intended to start or regulate the appliance during normal operation. An example would be a water temperature-regulating control. An operating control could provide Type 1 or Type 2 action. (See denitions 5.9 and
45、5.10.) 5.5.1 added April 22, 2009 5.6 OUTER JACKET The part of the water heater that surrounds the storage tank and that is intended to provide mechanical protection for the tank and for thermal insulation when the insulation is provided. The outer jacket also serves as an enclosure of current-carry
46、ing parts and insulated conductors between heating elements in separate control or wiring compartments. 5.6.1 PROTECTIVE CONTROL A control intended to prevent the risk of electric shock, re, or injury to persons during abnormal operation of the appliance. An example would be a water temperature limi
47、t control. A protective control always provides Type 2 action. (See denitions 5.9 and 5.10.) 5.6.1 added April 22, 2009 JULY 15, 2011 HOUSEHOLD ELECTRIC STORAGE TANK WATER HEATERS - UL 174 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.7
48、 SMALL CAPACITY STORAGE TANK WATER HEATER A water heater marked with a rated capacity within the range of 1 gallon (3.8 L) to 5 gallons (18.9 L). 5.8 STORAGE TANK The part of the heater (either with or without the heating elements) that is intended to contain or store water and that has a rated capa
49、city of 1 gallon (3.8 L) or more. 5.9 TYPE 1 ACTION Automatic action for which the manufacturing deviation and the drift of its operating value, operating time, or operating sequence have not been declared and tested to the Standard for Automatic Electrical Controls for Household and Similar Use, Part 1: General Requirements, UL 60730-1. 5.9 revised July 15, 2011 5.10 TYPE 2 ACTION Automatic action for which the manufacturing deviation and the drift of its operating value, op
