1、 NEMA DC 10 RESIDENTIAL CONTROLS TEMPERATURE LIMIT CONTROLS FOR ELECTRICAL BASEBOARD HEATERS Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright National Electrical
2、 Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NEMA Standards Publication DC 10-2009 Residential ControlsTemperature Limit Controls for Electrical Baseboard Heaters Published by: National Electrical
3、 Manufacturers Association 1300 North 17th Street Rosslyn, Virginia 22209 www.nema.org Copyright 2009 by the National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protectio
4、n of Literary and Artistic Works, and the International and Pan American Copyright Conventions. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NOTICE AND DISCLAIMER The
5、information in this publication was considered technically sound by the consensus of persons engaged in the development 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
6、 of this document. The National Electrical Manufacturers Association (NEMA) standards and guideline publications, 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 vie
7、ws of persons who have an interest in the topic covered by this publication. While NEMA administers the process 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 completene
8、ss of any information or the soundness of any judgments contained in its standards and guideline publications. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resu
9、lting from the publication, use of, application, or reliance on this document. NEMA disclaims and makes no guaranty 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 wil
10、l fulfill any of your particular purposes or needs. NEMA does not undertake to guarantee the performance of any 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 professiona
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12、ermining the exercise of reasonable care in any given circumstances. Information and other standards on the topic 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
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14、is document shall not be attributable to NEMA and is solely the responsibility of the certifier or maker of the statement. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,
15、-DC 10-2009 Page i CONTENTS Foreword ii History of Standardsiii Section 1 GENERAL. 1 1.1 Scope 1 1.2 References 1 1.3 Definitions . 1 Section 2 RATINGS AND CLASSIFICATIONS 3 2.1 Voltage Ratings. 3 2.2 Current Ratings. 3 2.3 Functional Classifications . 3 2.3.1 Linear-Sensing Type. 3 2.3.2 Spot-Sensi
16、ng Type 3 Section 3 CONSTRUCTION . 4 3.1 Envelope Dimensions . 4 3.1.1 Linear-Sensing Type. 4 3.1.2 Spot-Sensing Type 4 3.2 Mounting . 4 3.2.1 Linear-Sensing Type. 4 3.2.2 Spot-Sensing Type 4 3.3 Connections 4 3.3.1 Terminals. 4 3.3.2 Wiring 4 3.4 Operating Mechanism. 4 3.5 Enclosure 5 3.6 Corrosion
17、 Protection . 5 3.7 Adjustments 5 Section 4 PERFORMANCE 6 4.1 Cut-out Settings 6 4.2 Cut-in Settings. 6 4.3 Determination of Cut-out and Cut-in Temperatures . 6 4.3.1 Linear-Sensing-Type Controls 6 4.3.2 Spot-Sensing-Type Controls. 7 4.4 Endurance. 7 Section 5 MARKING . 8 5.1 Marking . 8 Section 6 A
18、PPLICATION 9 6.1 Installation. 9 6.2 Wiring 9 6.2.1 Spot-Sensing Type 9 6.2.2 Linear-Sensing Type. 9 6.3 Instructions 9 6.4 Spot-Type Control Systems 9 Copyright 2009 by the National Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under l
19、icense with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 10- 2009 Page ii Foreword This Standards Publication defines the basic standards for rating, classification, construction, testing, and performance of temperature limits controls for application on
20、electric baseboard heaters. It has been developed in the public interest and is designed to promote a better understanding between the manufacturer and the user, where possible, to provide direct interchangeability through industry standardization, and to assist the user in selecting the proper cont
21、rols for his or her particular application. 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: Vice President, Technical Service
22、s National Electrical Manufacturers Association 1300 North 17th Street, Suite 1752 Rosslyn, Virginia 22209 This Standards Publication 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 part
23、icipated in its development. At the time it was approved, the group was composed of the following members: Apcom Inc.Franklin, TN Emerson Electric Company, White-Rodgers DivisionSt. Louis, MO GE Industrial SystemsMorrison, IL Honeywell, Inc.Golden Valley, MN Therm-O-DiscMansfield, OH Copyright 2009
24、by the National Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 10-2009 Page iii History of Standards The Residential Controls Se
25、ction 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, and dimensions. NEMA standards are voluntary and are designed to eliminate misunderstandings between the purchaser an
26、d 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. DC XX (followed by the year of issue). The Technical Committee of the Residential Controls Section of NEMA first formed a subcommittee t
27、o develop temperature limit control standards for electric baseboard heaters in 1960. The deliberations of this committee resulted in the NEMA Standards Publication for Temperature Limit Controls for Electric Baseboard Heaters, DC 10-1964, which was later revised and superseded first by DC 10-1971,
28、by DC 10-1977, and then by DC 10-1983. The present publication, DC 10-2009, is published in accordance with NEMAs policy of periodic review and revision to keep NEMA Standards contemporary with industry needs and technological advancement. It revises the 1983 edition. Copyright 2009 by the National
29、Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 10- 2009 Page iv Copyright 2009 by the National Electrical Manufacturers Associat
30、ion. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 10-2009 Page 1 Section 1 GENERAL 1.1 SCOPE This Standards Publication describes constructional details, classifica
31、tions, ratings, and other characteristics of temperature limit controls and control systems of the linear-sensing or spot types, which are suitable for mounting inside electric baseboard heaters for the purpose of disconnecting the electrical load when the heater reaches abnormally high temperatures
32、. The controls and control systems described in this Standards Publication are nonadjustable, operate at factory preset temperatures, and may be of the automatic- or manual-reset type. 1.2 REFERENCES The following normative documents contain provisions, which through reference in this text, constitu
33、te provisions of this Standards Publication. By reference herein these publications are adopted, in whole or in part as indicated, in this Standards Publication. Underwriters Laboratories Inc. 333 Pfingsten Road Northbrook, IL 60062 ANSI UL 873 Standard for Temperature-Indicating and -Regulating Equ
34、ipment 1.3 DEFINITIONS automatic-reset control: A control that opens and recloses the circuit automatically. cut-in temperature: The temperature in degrees C (degrees F) at which the circuit to the electrical load is restored automatically or can be restored by manual resetting action. cut-out tempe
35、rature: The factory preset temperature in degrees C (degrees F) at which the control opens the circuit to the electrical load. cut-out temperature drift: The change in degrees C (degrees F) in the cut-out temperature as a result of a continuous cycling of the temperature limit control. differential:
36、 The difference between the cut-out and the cut-in temperatures. hot spot: The portion of the sensing element that causes the control to cut-out when it is subjected to the abnormally high temperature that it is intended to limit. It is stated in terms of a specific length. (See Table 4-1.) load, el
37、ectrical: The resistive noninductive controlled load expressed in volts and amperes or watts; or the inductive controlled load expressed in volts and amperes. manual-reset control: A control that opens the circuit automatically and is reclosed manually. pilot duty: A class of operation in which the
38、ultimate electrical load is controlled by auxiliary means. rating, electrical: The maximum specified electrical load capability of the control. Copyright 2009 by the National Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under license w
39、ith NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 10-2009 Page 2 sensing element: A continuous temperature-sensing element of the control, generally mounted horizontally inside the baseboard heater in a protected location and in a manner that enables it to
40、 sense abnormally high temperatures. temperature limit controls: linear-sensing type: A control body and a sensing element no less than 355 mm (14 in.) long, capable of sensing and reacting to temperature changes along its length. spot-sensing type: A control body with an integral sensing element ca
41、pable of sensing and reacting to temperature changes at a particular location. Copyright 2009 by the National Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted wit
42、hout license from IHS-,-,-DC 10-2009 Page 3 Section 2 RATINGS AND CLASSIFICATIONS 2.1 VOLTAGE RATINGS Temperature limit controls shall have voltage ratings within the range of 120 to 600 volts, AC, inclusive. 2.2 CURRENT RATINGS Temperature limit controls shall have at least one of the following cur
43、rent ratings: Voltage Current (V) Resistive (A) Pilot Duty (VA) 120 25 480 240 25 480277 25 480 480 12.5 -600 - 125 2.3 FUNCTIONAL CLASSIFICATIONS 2.3.1 Linear-Sensing Type A control that incorporates a linear sensing element that opens the control switch as a function of a hot spot at any point alo
44、ng the entire length of the sensing element. The sensing element is not connected into the electrical circuit. 2.3.2 Spot-Sensing Type A control having an integral sensing element that opens the control switch as a function of a hot spot at the control location. The sensing element may or may not be
45、 connected directly into the electrical circuit. Copyright 2009 by the National Electrical Manufacturers Association. Copyright National Electrical Manufacturers Association Provided by IHS under license with NEMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-DC 1
46、0-2009 Page 4 Section 3 CONSTRUCTION 3.1 ENVELOPE DIMENSIONS 3.1.1 Linear-Sensing Type The sensing element is generally a sensing tube (capillary) containing a temperature-sensing fluid. Generally, the outside diameter of the tube-type sensing element does not exceed 3 mm (1/8 in.), and its length i
47、s no less than 355 mm (14 in.) and no more than 3,660 mm (12 ft). The control body is generally of such a size as to be suitable for mounting in a space of 57 mm (2 in.) deep behind the mounting face. 3.1.2 Spot-Sensing Type These controls are generally tubular or round and are supplied with or with
48、out mounting means by the manufacturer. The envelope dimensions depend on the type of configuration but should be within 70 mm x 25 mm x 16 mm (2 in. x 1 in. x in.) 3.2 MOUNTING Temperature limit controls shall be suitable for mounting inside a baseboard heater. 3.2.1 Linear-Sensing Type Provision should be made for mounting the control with two No. 6 or No. 8 screws or equivalent means. The distance between the centerline of mounting holes should be 42 mm (1 in.) or 50 mm (2 in). 3.2.2 Spot-Sensing Type If mounting means are not provided
