1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 834 Heating, Water Supply, and Power Boilers ElectricUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUT
2、HORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Heating, Water Supply, and Power Boilers Electric, UL 834 Fifth Edition, Dated April 13, 2004 Summary of Topics This revision to UL 834 is being issued to address universal upkeep of UL Standards f
3、or Safety. These revisions are considered to be non-substantive and not subject to ULs STP process. 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 ma
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10、. DECEMBER 9, 2013 UL 834 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 9, 2013 UL 834 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL APRIL 13,
11、 2004 (Title Page Reprinted: December 9, 2013) 1 UL 834 Standard for Heating, Water Supply, and Power Boilers Electric The rst edition was titled Standard for Electric Boilers First Edition November, 1976 Second Edition July, 1980 Third Edition November, 1991 Fourth Edition January, 1995 Fifth Editi
12、on April 13, 2004 This ANSI/UL Standard for Safety consists of the Fifth edition including revisions through December 9, 2013. The most recent designation of ANSI/UL 834 as an American National Standard (ANSI) occurred on January 14, 2013. ANSI approval for a standard does not include the Cover Page
13、, 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-Line Collaborative Standards Development System (CSDS) at http:/. ULs Sta
14、ndards 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 sole and exclusive property of UL. COPYRIGHT 2013 UNDERWRITERS LABORAT
15、ORIES INC. ANSI/UL 834-2013UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL JANUARY 14, 2013 HEATING, WATER SUPPLY, AND POWER BOILERS ELECTRIC - UL 834 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR D
16、ISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .5 2 Components 6 3 Units of Measurement .6 4 Undated References 6 5 Special Designations 6 6 Glossary 6A CONSTRUCTION 7 Frame and Enclosure 9 7.1 General .9 7.2 Doors and covers .11 7.3 Enclosure thickness .12 7.4 Live parts 18 8
17、Protection of Service Personnel .23 9 Mechanical Assembly 27 10 Corrosion Protection 28 11 Electrical Supply Connections of Permanently Connected Boilers .28 12 Field Wiring System Connections .28 13 Provisions For Connections To Busway .29 14 Field Wiring Terminals and Leads 31 15 Cord-Connected Bo
18、ilers .33 16 Wiring Space .34 17 Stability 37 18 Current-Carrying Parts 37 19 Internal Wiring 37 19.1 General .37 19.2 Methods 38 20 Splices 39 21 Separation of Circuits .40 22 Barriers 41 23 Heating Elements .41 24 Electrical Insulation .41 25 Thermal Insulation 42 26 Motors .42 27 Overcurrent Prot
19、ection 42 27.1 Heating element circuits .42 27.2 Internal conductors .43 27.3 Motors 44 27.4 Receptacles and lamps .45 27.5 Control circuits .45 27.6 Direct-connected high-voltage control circuit .45 27.7 Tapped high-voltage control circuits 45 28 Transformer Overcurrent Protection .47 28.1 High-vol
20、tage transformer 47 28.2 Low-voltage transformers 48A 29 Lampholders 48A 30 Switches .48A JANUARY 14, 2013 HEATING, WATER SUPPLY, AND POWER BOILERS ELECTRIC - UL 834 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 31 Limit Controls .48B 32
21、Low-Water Cutoff .50 33 Terminals and Sensing Elements of Operating and Limit Controls 51 34 Pressure-Relieving Devices 51 35 Spacings 52 36 Grounding .53 PERFORMANCE 37 General 56 38 Test Installation for Alcove or Closet 56 39 Leakage Current Test .59 40 Power Input Test .63 41 Limit Control Cutou
22、t Test 63 42 Temperature Test .64 43 Continuous Operation Test .67 43.1 General .67 43.2 Hot water boiler 67 43.3 Steam boiler .68 44 Pump-Failure Test 68 45 Blocked-Flow Test 68 46 Dielectric Voltage-Withstand Test .68 47 Insulation Resistance Test .69 48 Overload Tests .70 49 Low Water Abnormal Te
23、st .70 50 Short Circuit Test .71 51 Burnout Test High-Voltage Transformer 72 52 Overload Test High-Voltage Transformer 73 53 Push-Back Relief Test .73 MANUFACTURING AND PRODUCTION TESTS 54 Production-Line Dielectric Voltage-Withstand Test 73 55 Production-Line Grounding-Continuity Test .75 RATING 56
24、 Details .75 MARKING 57 Details .76 INSTRUCTIONS 58 Details .80 APPENDIX A Standards for ComponentsA1 APRIL 7, 2009 HEATING, WATER SUPPLY, AND POWER BOILERS ELECTRIC - UL 834 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Sc
25、ope 1.1 These requirements cover electric heating, water supply, and power boilers rated at 600 volts or less intended for commercial or industrial applications utilizing hot water or steam. They may also be used for commercial, industrial, or residential use space heating applications. 1.2 These bo
26、ilers are intended for installation in accordance with the National Electrical Code, NFPA 70, and other applicable codes, such as the BOCA National Mechanical Code, the Standard Mechanical Code, and the Uniform Mechanical Code. 1.3 Each boiler consists of sheathed resistance-type heating elements an
27、d a vessel or tank constructed, inspected, and stamped in accordance with the applicable sections of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code. Each boiler is provided with one or more safety valves or safety relief valves conforming to ASME requirements wit
28、h all necessary temperature or pressure regulating controls, including an integral limit control, wiring, and auxiliary equipment assembled as a unit. 1.4 These requirements do not cover water supply boilers and hot water and steam generating equipment employing constructions which are outside the s
29、cope of, or not covered by, the ASME codes, nor commercial cooking or medical and dental equipment, nor other electric heating equipment or appliances which are covered in, or as part of, separate, individual requirements. Electrode-type boilers also are not covered by these requirements. 1.5 The eq
30、uipment covered by this standard shall be one of the following types of water heating boilers: a) High Pressure A boiler furnishing: 1) Steam at pressures in excess of 15 psi (103 kPa); or 2) Hot water at temperatures in excess of 250F (121C) or at pressures in excess of 160 psi (1103 kPa). b) Low-P
31、ressure Hot-Water and Low-Pressure Steam A boiler furnishing: 1) Hot water at pressures not exceeding 160 psi and at temperatures not more than 250F; or 2) A boiler furnishing steam at pressures not more than 15 psi. c) Miniature A boiler that does not exceed the following limits: 1) 16 inches (406
32、mm) inside diameter of shell; and 2) 5 cubic feet (0.14 m 3 ) gross volume, exclusive of casing and insulation, and 100 psi (690 kPa) maximum allowable working pressure. For the applicable ASME Code symbol, see Section 5. 1.5 revised April 7, 2009 APRIL 7, 2009 HEATING, WATER SUPPLY, AND POWER BOILE
33、RS ELECTRIC - UL 834 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2 Components 2.1 Except as indicated in 2.2, a component of a product covered by this standard shall comply with the requirements for that component. See Appendix A for a
34、list of standards covering components generally used in the products covered by this standard. 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 standard, o
35、r 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 intended for
36、use only under limited conditions, such as certain temperatures not exceeding specied limits, and shall be used only under those specic conditions. 2.5 A component of a boiler intended to be manually operated or adjusted or that will denitely require periodic servicing, for example replacement or cl
37、eaning, shall be accessible without the use of special tools. 3 Units of Measurement 3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory or approximate information. 4 Undated References 4.1 Any undated reference to a code or standard appearing in the requ
38、irements of this standard shall be interpreted as referring to the latest edition of that code or standard. 5 Special Designations 5.1 A boiler assembly shall be constructed, equipped, inspected, tested, and marked in accordance with the applicable sections of the ASME Boiler and Pressure Vessel Cod
39、e. The boiler marking shall consist of the ASME Code symbol and one of the following Designators. E Designates a high pressure boiler see 1.5(a) constructed as follows: 1) The boiler pressure vessel has been assembled by a manufacturer other than the boiler manufacturer in accordance with the ASME B
40、oiler and Pressure Vessel Code, Section I, Rules for Construction of Power Boilers or Section VIII, Division 1 as permitted by ASME Boiler and Pressure Vessel Code, Section I, Part PEB, Rules for Construction of Pressure Vessels; 2) The pressure vessel is stamped with the ASME Code Designator S , M
41、,o rU ; and 3) The boiler is assembled by methods that do not involve any welding or brazing of parts to the pressure vessel. JANUARY 14, 2013 HEATING, WATER SUPPLY, AND POWER BOILERS ELECTRIC - UL 834 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSIO
42、N FROM UL H Designates a low pressure steam or hot water boiler see 1.5(b) constructed in accordance with the ASME Boiler and Pressure Vessel Code, Section IV, Rules for Construction of Heating Boilers. M Designates a miniature boiler see 1.5(c) constructed in accordance with the ASME Boiler and Pre
43、ssure Vessel Code, Section I, Part PMB, Rules for Construction of Power Boilers. S Designates a high pressure steam or high-temperature water boiler see 1.5(a) constructed in accordance with the ASME Boiler and Pressure Vessel Code, Section I, Rules for Construction of Power Boilers. U This Designat
44、or, along with the letters UB , applies only to a pressure vessel when the vessel is constructed in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, Rules for Construction of Pressure Vessels. The boiler has been completed in accordance with Section I, Part PEB, of
45、 the ASME Boiler and Pressure Vessel Code, Rule for Construction of Power Boilers. 5.1 revised January 14, 2013 6 Glossary 6.1 For the purpose of this standard the following denitions apply. 6.1.1 CONTROL ENCLOSURE PANEL An enclosure for individual electrical components to prevent accidental contrac
46、t with energized parts and to protect the components from physical damage. 6.1.1 added April 7, 2009 6.2 PROTECTIVE (SAFETY ) 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
47、 limit control. A protective control always provides Type 2 action. (See denitions 6.11 and 6.12.) 6.2 revised April 7, 2009 6.3 LIMIT CONTROL A protective (safety) control that is responsive to changes in pressure, temperature, liquid level, or ow. This control may be used for regulating purposes o
48、r may be set beyond the intended operating range of the controlled equipment to limit its operation. This control may be electrical or mechanical in nature. 6.3 revised April 7, 2009 6.4 LOW VOLTAGE CIRCUIT A circuit involving a potential of not more than 30 volts rms (42.4 volts peak) supplied by a
49、 battery or by a standard Class 2 transformer or other acceptable transforming device, or by a combination of transformer and xed impedance having output characteristics in compliance with requirements established for a Class 2 transformer. A circuit obtained by connecting resistance in series with a line voltage supply circuit as a means of limiting the voltage and current is not considered to be a low voltage circuit. 6.5 OPERATING CONT
