NEMA UC 2-1993 Undercarpet Power Distribution Systems《布线系统配电系统》.pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationNEMA UC 2-1993 (R2015)Undercarpet Power Distribution SystemsNEMA Standards Publication UC 2-1993 (R2000, R2005, R2010, R2015) Undercarpet Power Distribution Systems Published by: National Electrical Manufacturers Association 1300

2、 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 www.nema.org 2015 National Electrical Manufacturers Association. All rights including translation into other languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and

3、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 development and approval of the document at the time it was developed. Consensus does not necessarily mean t

4、hat there is unanimous agreement among every person participating in the development of this document. National Electrical Manufacturers Association (NEMA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards devel

5、opment 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 and establishes rules to promote fairness in the development of consensus, it does not write the document an

6、d 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. NEMA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whethe

7、r 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 guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herei

8、n, 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 individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing a

9、nd 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 by any person or entity to someone else. Anyone using this document should rely on his or her own independent

10、 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 topic covered by this publication may be available from other sources, which the user may wish to consult for ad

11、ditional 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 certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or

12、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 statement. NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page i 2015 National Electrical Manufacturers Associa

13、tion Foreword The purpose of this Standards Publication is to define the performance requirements for Type FCC systems. In the preparation of this standard, input of users and other interested parties has been sought and evaluated. Inquiries, comments, and proposed or recommended revisions should be

14、 submitted to the concerned NEMA product subdivision by contacting the: Senior Technical Director, Operations National Electrical Manufacturers Association 1300 North 17thStreet, Suite 900 Rosslyn, Virginia 22209 This Standards Publication was developed by the NEMA Undercarpet Premise Wiring Systems

15、 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 Undercarpet Premise Wiring Systems Section was composed of the following members: AMP IncorporatedHarrisburg, PA H

16、ubbell Incorporated, Wiring Device DivisionBridgeport, CT Thomas a burner suitable for the calorific value of the gas and having a bore of 3/8-inch a length of 4 inches above the primary air inlets; a 20-degree angle block for supporting the burner; a flame gauge to determine the height of the inner

17、 blue cone and the overall height of the flame; a supply of ordinary gas at normal pressure (range approximately form 3-5 inches of water); a watch or clock with a hand which makes one complete revolution each minute; and flame indicators consisting of strips of gummed Kraft paper (60 pound stock),

18、5 mils in nominal thickness and -inch in width. NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page 14 2015 National Electrical Manufacturers Association 4.4.3.2 Bottom Shield Test Requirements A bottom shield of non-metallic material, when tested as specified in 4.4.3.2.1, shall not convey flame or co

19、ntinue to flame longer than 60 seconds following any of five 15-second applications of the test flame. The period between applications shall be 15 seconds. A specimen is considered to have conveyed flame if more than 25% of the extended portion of the indicator is burned. 4.4.3.2.1 Bottom Shield Tes

20、t Procedure The test shall be conducted in a room or enclosure from which all drafts of air are excluded. A steel rod 18 inches long and 0.375 inches (9.5 mm) in diameter shall be supported. A 36 inch length of material having an approximate width of inches shall be secured by overlapping the first

21、turn of material to the rod held in a horizontal position. A weight exerting a force of 2 pounds (8N) shall then be attached to the free end of the material to provide tension. After 1 minute, under tension, the rod shall be slowly rotated, and the fixture tilted so that the material wraps with an o

22、verlap equal to one-half the width of the end of the material. After the wrapping has been completed, the lower end of the material shall be secured and the remaining length of material shall be cut off. A second wrapping shall be similarly applied with the direction of the advance of the turns of t

23、he material reversed from that of the first wrapping. Finally, a third wrapping of material shall be similarly applied with the direction of advance opposite to that of the second wrapping. This gives six thicknesses of material at each point along the wrapped mandrel. The specimen shall be held in

24、a vertical position by the support provided within the test chamber. A flame indicator shall be so applied to the specimen so that the lower edge is 10 inches above the point at which the inner blue cone of the flame is to be applied. The indicator shall be wrapped once around the specimen and the e

25、nds pasted evenly together and projecting -inch away from the specimen. The height of the test flame, with the burner vertical, shall be adjusted to 5 inches, with an inner blue cone 1-1/2 inches high. The burner shall then be tilted to an angle of 20 degrees from vertical and the tip of the inner b

26、lue cone of the test flame shall be applied to the specimen at a point approximately 6 inches above its lower end. In this position, the test flame shall be directed against the specimen for a period of 15 seconds, then removed for 15 seconds. This cycle shall be repeated until five applications of

27、the test shave been made. Following the final application of the flame, the length of time to extinction shall be measured (see Figure 4-2). 4.4.3.2.2 Type FCC Cable 4.4.3.3.1 Horizontal Test Requirements Type FCC cable when tested as specified in 4.4.3.3.2 shall not convey flame or continue to flam

28、e longer than 60 seconds following the 30 second application of the test flame. A specimen is considered to have conveyed flame if flaming of the sample progresses beyond either or both of the 2 inch indicators. 4.4.3.3.2 Horizontal Test Procedure The test shall be conducted in a room or enclosure f

29、rom which all drafts of air are excluded. A 10 inch long specimen shall be secured with its longitudinal axis horizontal in the center of the enclosure. The sample supports shall be 8 inches apart, and three metal rods or equivalent permanent means whose free ends are not closer than -inch to the sp

30、ecimen, shall be used to indicate three points on the specimenthe point midway between the specimen supports and points 2 inches to each side of the specimen midpoint. The height of the test flame, with the burner vertical, shall be adjusted to 5 inches, with an inner blue core 1-1/2 inches high. Th

31、e burner shall then be tilted to an angle of 20 degrees from vertical and the tip of the inner blue core of the test flame shall be applied to the center of one of the central conductors of the specimen (see Figure 4-3). NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page 15 2015 National Electrical Ma

32、nufacturers Association 4.4.3.3.3 Vertical Test Requirements The insulation on the Type FCC cable shall be such that it will not convey flame or continue to burn for more than 1 minute after five 15-second applications of a standard test flame, the period between applications of such flame being 15

33、seconds when specified according to the method in 4.4.3.4.2. A specimen is considered to have conveyed flame if more than 25% of the extended portion of the indicator is burned or if flaming of the sample continues longer than 60 seconds. 4.4.3.3.4 Vertical Test Procedure The test shall be conducted

34、 in a room or enclosure from which all drafts of air are excluded. A 24-inch long specimen shall be held in a vertical position by the support provided within the test shield. A flame indicator shall be so applied to the specimen that the lower edge is 10 inches above the point at which the inner bl

35、ue cone of the flame is to be applied. The indicator shall be wrapped once around the specimen with the gummed side toward the conductor and the ends pasted evenly together and projecting -inch away from the wire on the back side of the wire. The height of the test flame, with the burner vertical, s

36、hall be adjusted to 5 inches, with an inner blue cone 1-1/2 inches high. The burner shall then be tilted to an angle of 20 degrees from vertical and the tip of the inner blue cone of the test flame shall be applied to the center of one of the central conductors of the specimen at a point approximate

37、ly 6 inches above its lower end. In this position, the test flame shall be directed against the specimen for a period of 15 seconds, then removed for 15 seconds. This cycle shall be repeated until five applications of the test flame have been made. Following the final application of the flame, the l

38、ength of time to extinction shall be measured (see Figure 4-4). 4.4.4 Dielectric Withstand The center 10 feet of a sample with a minimum length of 11 feet shall be immersed in tap water for 6 hours and while still immersed shall be capable of withstanding for a period of 1 minute, a voltage of 1500

39、VAC, 60 Hz applied at a rate not to exceed 500 volts per second. The test potential shall be applied between each insulated conductor(s) and all other conductors and ground (water). In all cases, the ends of the conductor of the specimen shall be spaced from the grounded electrode a sufficient dista

40、nce to prevent flashover at the ends during application of the test potential. 4.4.4.1 Apparatus The apparatus shall be capable of supplying 1500 VAC, 60 Hz at a rate of 500 volts per second. The output capacity shall be sufficient to maintain 1500 VAC, 60 Hz across the specimen insulation for 1 min

41、ute under “no fault” conditions, and to actuate the fault indicator under “fault” conditions. A tank is needed in which the specimen shall be completely covered, except for the ends. A grounding electrode shall be immersed in the water and connected to the grounded side of the test potential apparat

42、us. NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page 16 2015 National Electrical Manufacturers Association Figure 4-2 BOTTOM SHIELD FLAME TEST NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page 17 2015 National Electrical Manufacturers Association Figure 4-3 HORIZONTAL FLAME TEST NEMA UC 2-1993 (R2000

43、, R2005, R2010, R2015) Page 18 2015 National Electrical Manufacturers Association Figure 4-4 VERTICAL FLAME TEST NEMA UC 2-1993 (R2000, R2005, R2010, R2015) Page 19 2015 National Electrical Manufacturers Association 4.4.4.2 Temperature The test shall be conducted with the water at any convenient tem

44、perature. 4.4.5 Insulation Resistance at 15.6C The insulated conductors, when tested for insulation resistance immediately following the dielectric withstand test specified in 4.4.4.1 and while still immersed, shall have an insulation resistance of not less than 200 megohms based on 1000 feet when t

45、ested in tap water at 15.6 1C. 4.4.5.1 Apparatus The following apparatus shall be used. A suitable tank shall be capable of maintaining the water within the required temperature range. The tank, if metal, shall be grounded or, if non-metallic, shall contain a grounded electrode. Where a galvanometer

46、 method is used, a sensitive galvanometer, a constant potential source of 100-500 volts dc (open circuit), a standard resistance, and necessary shunts, all connected as illustrated in Figure 4-5, are required. The instruments shall be mounted so that they will be reasonably free from vibration and w

47、ill not be affected adversely by local conditions. The means for indicating the degree of deflection shall be such as to produce a sharply outlined indicator on the scale and the deflection shall be not less than 6 inches, measured from zero, when the variable shunt has been set to determine the con

48、stant of the galvanometer (if the constant is of the order of 50,000). The resistance and shunts shall be calibrated. A megohmeter shall be permitted to be used which is suitable for indicating the insulation resistance directly when a dc potential of 100-500 volts has been impressed on the insulati

49、on for 3 minutes. 4.4.5.2 Preparation for Test The preparation of the cable for IR testing shall be the same as for dielectric withstand testing as outlined in 4.4.4 and, in the case of IR at 15.6C, the test will normally be carried out immediately following the dielectric withstand test. The IR test shall be carried out with a water temperature of 15.6 1C for at least 30 minutes prior to testing. 4.4.5.3 Determination Using Galvanometer Method The insulated conductor under test, conditioned as outline in 4.4.5.1, shall be connected to switch SW2, together wi