1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA DC 13-1979 (R2013)Residential Controls Line-Voltage Integrally Mounted Thermostats for Electric HeatersNEMA DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Residential Controls Line-Voltage Integrally Mounted Thermosta
2、ts for Electric Heaters Published by National Electrical Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 www.nema.org Copyright 2013 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Uni
3、versal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. NOTICE AND DISCLAIMER The information in this publication was considered technically sound by the consensus of persons engaged in the dev
4、elopment and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the development of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publication
5、s, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together volunteers and/or seeks out the views of persons who have an interest in the topic covered by this publication. While NEMA administers the process
6、 and establishes rules to promote fairness in the development of consensus, it does not write the document and it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgments contained in its standards and guideline publications.
7、NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guar
8、anty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any
9、 individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, NEMA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is NEMA undertaking to perform any duty owed
10、by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Information and other standards on the top
11、ic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. NEMA has no power, nor does it undertake to police or enforce compliance with the contents of this document. NEMA does not certi
12、fy, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safetyrelated information in this document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the
13、 statement. DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page i 2013 National Electrical Manufacturers Association CONTENTS Page Foreword iii History of Standards iv Section 1 GENERAL . 1 1.1 Scope . 1 1.2 References 1 1.2.1 Normative References. 1 1.3 Definitions 2 Section 2 RATINGS AND CL
14、ASSIFICATIONS. 3 2.1 Voltage Ratings . 3 2.2 Current Ratings 3 2.3 Functional Classifications 3 2.3.1 Single-line Break (Single-pole) Thermostat. 3 2.3.2 Double-line Break Disconnect Thermostat 3 2.3.3 Double-line Break Cycling Thermostat 3 2.3.4 Two-stage Thermostat 3 2.3.5 Two-circuit Thermostat 3
15、 Section 3 CONSTRUCTION 4 3.1 Connections . 4 3.1.1 Terminals . 4 3.1.2 Terminal Spacings . 4 3.1.3 Field Connections 4 3.1.4 Mounting Dimensions 4 3.1.5 ANSI/NFPA 70. 4 3.2 Thermostats . 4 3.2.1 Thermostat Design 4 3.2.2 Thermostat Strength 5 3.2.3 Shipping and Storage of Thermostats . 5 3.2.4 Ther
16、mostat Bulbs 5 3.2.5 Thermostats for Fixed Electric Spacing Heating Equipment . 5 3.2.6 Iron and Steel Parts of Thermostats . 5 3.3 Assembly . 5 3.4 Adjustments . 5 3.4.1 Temperature Setting 5 3.4.2 Dial Shaft . 5 3.4.3 Temperature Range and Dial Arrangement 6 3.4.4 Accuracy of Temperature Setting A
17、djustment . 6 3.4.5 Factory Adjustment . 6 3.4.6 Sealing and Locking 6 3.5 Spacings 6 3.6 Line-Voltage Thermostat Grounding (Earthing) . 6 Section 4 TESTING AND PERFORMANCE . 7 4.1 Dielectric Tests 7 4.2 Endurance Test . 7 4.3 Overload Test 7 4.4 Temperature 7 4.5 Environmental Tests 7 4.5.1 General
18、 Conditions 7 4.5.2 Operating Differential 7 4.5.3 Operating Differential Test 7 DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page ii 2013 National Electrical Manufacturers Association Section 5 MARKING 8 5.1 Markings 8 5.1.1 Thermostat Markings 8 5.1.2 Nature of Markings 8 5.1.3 Location o
19、f Markings . 8 5.1.4 Terminal Markings . 8 5.1.5 Markings for Shaft Flat 8 Section 6 APPLICATION . 9 6.1 Application . 9 6.1.1 Manufacturers Instructions and Warnings 9 6.1.2 Line-voltage Integrally Mounted Thermostats . 9 6.1.3 Enclosure 9 6.1.4 Proper Temperature Set-point Reference . 9 6.1.5 Maxi
20、mum Ambient Temperature Rating . 9 6.1.6 Support of Capillary . 9 6.1.7 Performance Data . 9 Figures 31 Mounting Dimensions 4 32 Dial Arrangement And Dimensions . 6 DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page iii 2013 National Electrical Manufacturers Association Foreword This standar
21、ds publication defines the basic standards for the construction and performance of the line-voltage integrally mounted thermostats for electric heaters. It has been developed in the public interest and is designed to provide a better understanding between the manufacturer and the user and to assist
22、the user in selecting and obtaining the proper thermostat for his or her particular need. If a value for measurement as given in this standards publication is followed by an equivalent value in other units, the first stated value is to be regarded as the requirement. The given equivalent value may b
23、e only approximate. These standards are periodically reviewed by the Residential Controls Section of NEMA for any revisions necessary to keep them up-to-date with advancing technology. Proposed or recommended revisions should be submitted to: Senior Technical Director, Operations National Electrical
24、 Manufacturers Association 1300 North 17th Street, Suite 900 Rosslyn, Virginia 22209 NEMA DC 13-1979 (R1985, R1991, R1997, R2002, R2007) revises and supersedes the NEMA DC 13-1979 (R1985, R1991, R1997, R2002) Line-voltage Integrally Mounted Thermostats for Electric Heaters. This standards publicatio
25、n was developed by the Residential Controls Section. Section approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. At the time it was approved, the group was composed of the following members: Apcom Inc.Franklin, TN Br
26、aeburn Systems Inc.Franklin, TN Emerson Electric Company, White-Rodgers DivisionSt. Louis, MO GE Industrial SystemsMorrison, IL Honeywell, Inc.Golden Valley, MN Johnson Controls, Inc.Milwaukee, WI Sensata Technologies.Attleboro, MA Therm-O-DiscMansfield, OH DC 13-1979 (R1985, R1991, R1997, R2002, R2
27、008, R2013) Page iv 2013 National Electrical Manufacturers Association History of Standards The Residential Controls Section of NEMA was formed in 1940 to promote the standardization of products within the scope of the Section. These product standards cover definitions, ratings, performance, testing
28、, and dimensions. NEMA Standards are voluntary and are designed to eliminate misunderstandings between the purchaser and the manufacturer. This publication is one of a series sponsored by the Residential Controls Section. Other publications in this series are identified as Pub. No DCXX (followed by
29、the year of issue). The development of NEMA Standards for line-voltage integrally mounted thermostats for electric heaters was prompted by a need for a basic set of standards for construction and performance that were not covered by other standards. Action was first taken in 1963 to develop standard
30、s for line-voltage integrally mounted thermostats for electric heaters by the NEMA Subcommittee for Room Thermostats. The first publication was issued in 1964 and designated DC 13-1964. NEMA DC 3- 2003 covers wall-mounted thermostats.DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page 1 2013
31、National Electrical Manufacturers Association Section 1 GENERAL 1.1 SCOPE This Standards Publication covers line-voltage integrally mounted thermostats for electric heaters and contains definitions, ratings, construction features, performance, marking, and application information. 1.2 REFERENCES In
32、this publication, reference is made to the standards listed below. Copies are available from the indicated sources. 1.2.1 Normative References The following normative documents contain provisions, which through reference in this text, constitute provisions of this Standards Publication. By reference
33、 herein these publications are adopted, in whole or in part as indicated, in this SP. American National Standards Institute (ANSI) 11 West 42nd Street New York, NY 10036 National Fire Protection Agency Batterymarch Park Quincy, MA 02269 ANSI NFPA 70-2005 National Electrical Code National Electrical
34、Manufacturers Association 1300 N. 17th Street Suite 900 Rosslyn, VA 22209 DC 3-2003 Wall Mounted Room Thermostats Underwriters Laboratories Inc. 333 Pfingsten Road Northbrook, IL 60062 ANSI UL 310- 2003 Electrical Quick-Connect Terminals ANSI UL 486A- 2003 Wire Connectors and Soldering Lugs for Use
35、with Copper Conductors ANSI UL 486B- 2003 Wire Connectors for Use with Aluminum Conductors ANSI UL 873-1994 Temperature-Indicating and -Regulating Equipment DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page 2 2013 National Electrical Manufacturers Association 1.3 DEFINITIONS control point:
36、The control point is the value of the mean air temperature at the thermostat under specified operating conditions. cut-in point: The cut-in point is the air temperature at the thermostat at which it initiates actions. cut-out point: The cut-out point is the air temperature at the thermostat at which
37、 it initiates action. differential, mechanical: The mechanical differential is the difference in temperature set-point between the cut-in and cut-out points as determined by manually raising and lowering the thermostat setting with no electrical load. differential, operating: The operating different
38、ial is the difference between the cut-in and the cut-out points as measured at the thermostat under specified operating conditions. line-voltage integrally mounted thermostat for electric heaters: A line-voltage integrally mounted thermostat for electrical heaters is a device which acts to automatic
39、ally control the temperature of the room or space in which it is installed by directly controlling the electrical load. It is factory installed or field installed within the normal wiring compartment of the heating device such as a space heater or a baseboard heater. load, electrical: The electrical
40、 load is any load expressed in volts with appropriate: a. Amperes and power factor, or b. Horsepower, or c. Motor currents, full load and inrush, or d. Volt ampere pilot duty designation, or e. Non-inductive load load, heating: The heating load is the rate of heat loss of the space being controlled.
41、 offset: Offset is the intentional difference between the cut-in point and the temperature set-point with no electrical load. operating range: Operating range is the temperature difference in C (F) from the maximum to the minimum scale setting of the thermostat. rating, electrical: The electrical ra
42、ting is the maximum specified electrical load of the thermostat. temperature set-point: The temperature set-point is the indicated temperature to which the thermostat is set. sensing element: The sensing element is the part of the thermostat that senses temperature and initiates control action. ther
43、mostat calibration: Thermostat calibration is the temperature at the cut-in point as measured at the thermostat for a specified scale setting. DC 13-1979 (R1985, R1991, R1997, R2002, R2008, R2013) Page 3 2013 National Electrical Manufacturers Association Section 2 RATINGS AND CLASSIFICATIONS 2.1 VOL
44、TAGE RATINGS Thermostats shall have voltage ratings within the range of 31 to 300 volts alternating current, inclusive. 2.2 CURRENT RATINGS Thermostats shall have the following current ratings: Volts Amperes 120 30 or less 208 30 or less 240 30 or less 277 25 or less All thermostats with an “off” po
45、sition shall open all ungrounded conductors when set in the “off” position as required by ANSI/UL 873. 2.3 FUNCTIONAL CLASSIFICATIONS Thermostats shall be described according to their switching functions, which include all connected electrical circuits as follows: 2.3.1 Single-line Break (Single-pol
46、e) Thermostat A thermostat that opens one ungrounded conductor of a single electrical load during cycling. 2.3.2 Double-line Break Disconnect Thermostat A double-line-break disconnect thermostat is a thermostat which includes two single-pole single-throw switches which open all ungrounded conductors
47、 of a single electrical load when set in the “off” position. 2.3.3 Double-line Break Cycling Thermostat A thermostat that opens all ungrounded conductors of a single electrical load during cycling. 2.3.4 Two-stage Thermostat A two-stage thermostat is a thermostat that controls two electrical loads w
48、ith separate switch actions. The calibration of each action shall be separated by an appropriate amount of temperature difference. 2.3.5 Two-circuit Thermostat A two-circuit thermostat is a thermostat that controls two separate electrical loads with one switching action. DC 13-1979 (R1985, R1991, R1
49、997, R2002, R2008, R2013) Page 4 2013 National Electrical Manufacturers Association Section 3 CONSTRUCTION 3.1 CONNECTIONS 3.1.1 Terminals Terminals shall be provided and arranged so that circuit conductors or terminals will not accidentally shorted or grounded when installed. 3.1.2 Terminal Spacings Wiring terminal spacings or external wire leads shall be in accordance with ANSI/UL 873. 3.1.3 Field Connections Terminals to which field connections are made shall provide good connections without loosening during field wiring and mounting. If a wire-binding
