ANSI NEMA C78.30-1997 Electric Lamps - Procedure for Use in Preparation of Lamp Space Drawings (First Edition).pdf

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1、NEMA Standards PublicationNational Electrical Manufacturers AssociationANSI C278.30-1997Electric LampsProcedure for Use inPreparation of LampSpace Drawings STD-NEMA C78-30-ENGL 3777 - b470247 OS33200 3b2 m ANSI C78.30-1997 American National Standard for electric lamps: Procedure for Use in Preparati

2、on of Lamp Space Drawings Secretariat C78 National Electrical Manufacturers Association Approved August 27,1997 American National Standards Institute ANSI C78.30-1997 Approval of an American National Standard requires verification by ANSI that the requirements for due process, consensus, and other c

3、riteria for approval have been met by the standards developer. An American National Standard implies a consensus of those substantially concerned with its scope and provisions. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reache

4、d by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The existence of an American Nati

5、onal Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. It is intended as a guide to aid the manufacturer, the consumer, and the general

6、 public. American National Standard The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Sta

7、ndard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on this title page. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures of the America

8、n National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Published by National E

9、lectrical Manufacturers Association 1300 N. 17th St., Suite 1847, Rosslyn, VA 22209 Copyright O 1 997 National Electrical Manufacturers Association All rights reserved. No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without prior written pe

10、rmission of the publisher. Printed in the United States of America Copyright O 1997 by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 i First Edition May 1997 _ STD-NEMA C78.30-ENGL 1777 H b470247 0533202 335 H ANSI C78.30-1997 THIS PAGE INTENTION

11、ALLY LEFT BLANK i Copyright O 1997 by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 First Edition May 1997 - . STD-NEMA C78.30-ENGL 1997 = b470247 0533203 071 = ANSI C78.30-1997 Table of Contents Foreword . v Scope and Purpose . 1 1.2 Purpose . 1

12、 1 . 1 Scope 1 General 1 Definitions and Fundamental Considerations . 1 3.1 Lamp Space Drawing . 1 3.3 Eccentricity 2 3.4 Bulb Shape Curves . 3 3.7 Maximum Outlines of Lamps 4 3.2 Lamp Positioning 2 3.5 Drawing Category . 3 3.6 Conversion to metric and rounding 4 Procedure for Use on Lamps with A. G

13、. PS or Similar Bulb Shapes . 6 4.1 Layout of Construction Drawing . 6 4.2 Layout of Final Lamp Space Drawing 16 Procedure for Use on Lamps with PAR and R Bulb Shapes . 18 5.1 Layout of Construction Drawing . 18 5.2 Layout of Final Drawing 27 Procedure for Use on Lamps with C or Similar Bulb Shapes

14、. 27 6.2 Layout of Final Drawing 35 6.1 Layout of Construction Drawing . 27 Copyright O 1997 by National Electrical Manufacturers Association 1300 North 17th Street. Suite 1847. Rosslyn. VA 22209 iii First Edition May 1997 ANSI C78.30-1997 THIS PAGE INTENTIONALLY LEFT BLANK iv Copyright O 1997 by Na

15、tional Electrical Manufacturers Association 1300 North 17th Street, Suite 1W7, Rocslyn, VA 22209 First Edition May 1997 STD-NEMA C78.30-ENGL 1997 D b470247 0533205 944 W ANSI C78.30-1997 Foreword (This foreword is not pari of the American National Standard C78.30-1997) Accredited Standards Committee

16、 for Lamps, C78, used outline drawings for incandescent lamps which have been in existence for some time. However, these drawings were not made by a consistent technique and they suffered a severe lack of completeness. Some early drawings depicted a typical lamp without regard to the space it might

17、take up when various dimensional tolerances were considered. Others showed both long and short bulbs without regard to skewness or eccentricity but did not add the credibility that dimensions would afford. Similar drawings in standards for other types of lamps introduced additional inconsistencies.

18、Subcommittee C78-1 undertook a project to remedy the shortcomings of earlier standard drawings. In addition, they set an objective to simplify the resultant space by using straight lines as much as possible and by eliminating complicated curves. Of course, this would have to be done so that no inter

19、ference between a lamp and luminaire would occur. SR30 was the result of that Subcommittees work. It was first issued in 1981. Part IV was added in 1985. It covers single-based, high intensity discharge type lamps (among others) as a result of feedback from sub- committee C78-4. It contains step-by-

20、step procedures that can be used to produce consistent, accurate, and simplified drawings. This First Edition of (278.30 capitalizes on the experience gained from applying the techniques outlined in the First and Second Editions of SR30. Although the procedures are written mainly for shapes that are

21、 usually used in incandescent and HID lamps, some minor revisions may be possible to extend the coverage to other fields. This standard is harmonized with IEC 1126. Suggestions for improvement of this standard will be welcome. They should be sent to the National Electrical Manufacturers Association,

22、 1300 N. 17th St., Suite 1847, Rosslyn, VA 22209. This standard was processed and approved for submittal to ANSI by the Accredited Standards Committee on Lamps, C78. Committee approval of this standard does not necessarily imply that all committee members voted for its approval. At the time it appro

23、ved this standard, the C78 Committee had the following members: AI Rousseau, Chairman, C78 and Technical Coordinator Randolph N. Roy, Secretariat Jeanne L. Spicer, Coordinating Editor Organization Represented: Name of Representative: Advance Transformer Company . Norman Grimshaw Duro-Test Corporatio

24、n Larry Sheinberg Edison Electric Institute . William Maguire (Delegate) General Electric Cynthia Minshall Illuminating Engineering Society . Rita M. Harrold ITS, Inc Craig Davenport OSRAM SYLVANIA INC. Peter Bleasby Philips Lighting Company Al Rousseau Underwriters Laboratories, Inc. . David Belt N

25、ational Electrical Manufacturers Association Ted Yahraus (Delegate) Copyright O 1997 by National Electrical Manufacturers Association . 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 V First Edition May 1997 STD-NEMA C78.30-ENGL 1797 b470247 051320b 880 H ANSI C78.30-1997 At the time it appro

26、ved this standard, the C78-1 Sub-Committee for Incandescent Lamps had the following members: Organization Represented: Name of Representative: Duro-Text Corporation (vacant) GE Lighting Bernard Rachel OSRAM SYLVANIA INC. David Fox Philips Lighting Company Ed Hinde Underwriters Laboratories, Inc. . D

27、avid Belt Cynthia Minshall (Alt.) Richard Fleegal (Alt.) Duane Will (Alt.) AI Rousseau (Alt.) vi Copyright O 1997 by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 First Edition May 1997 STDmNEMA C78-30-ENGL 1777 = b470247 05113207 717 AMERICAN NA

28、TIONAL STANDARD C78.30-1997 for electric lamps: Procedure for Use in Preparation of Lamp Space Drawings 1 Scopeandpurpose 1.1 scope This standard describes the procedures to be followed for the construction of lamp space drawings. 1.2 Purpose It is the purpose of this standard to provide guidelines

29、for the preparation of lamp space drawings for those specific bulb shapes and bases noted. 2 General Lamp space drawings are intended to be a guide to lamp manufacturers, luminaire manufacturers and the general public. A separate space drawing is to be provided for each category of bulb, base, and o

30、verall lamp length. The space defined in each drawing will permit the mechanical interchangeability of lamps made by different manufacturers. This document contains the procedural steps for drawing lamps employing A, G, PS, PAR, R, L, E, and BT shaped bulbs. PAR type lamps designed for rim-mounting

31、are excluded. Single-based lamps only are covered; no consideration has been given to double-based lamps. Although information is provided primarily for lamps with screw bases, consideration has been given to bayonet bases, and the procedures can be easily adopted for other types of bases. 3 Definit

32、ions and fundamental considerations 3.1 Lamp space drawing A lamp space drawing is a simplified, planar representation of a three dimensional volume. A space drawing is designed to incorporate the maximum variations in lamp overall length, bulb bowl and neck dimensions, and “eccentriciv (as defined

33、hereafter). All variations are accounted for relative to a fixed-position base. No allowances have been considered for the location of a lampholder relative to the remainder of a luminaire. No consideration has been given to special needs for ventilation, heat shielding, clearance for tools used dur

34、ing installation, etc. A lamp space drawing can be contrasted to a product drawing which shows internal technical features and dimensions of the assembled lamp itself. 3.1.1 The part of a lamp space drawing that depicts the maximum space occupied by any lamp in a particular category is shown as a so

35、lid-line outline. This outline is simplified to reduce the number of minor curved shapes of bulbs. Only major shape features are shown and straight lines are used as much as is practical. 3.1.2 Lamp space drawings are dimensioned with single-set numbers that define the required maximum space of the

36、lamp occupancy. Any negative tolerances fall within this maximum space. Dimensions are in millimeters unless otherwise noted. 3.1.3 Within the maximum space outline a typical bulb outline may be shown. If shown, a dashed line shall be used. It should be based on nominal dimensions, although there sh

37、all be no attempt to show dimensions Copyright O 1997 by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rosslyn, VA 22209 1 First Edition May 1997 ANSI C78.30-1997 for the typical bulb. Delineation of any parts inside a lamp is not appropriate unless all possible l

38、ocations of these parts are considered. 3.1.4 A lamp in these space drawings shall be oriented in the base-down position. Thus the base is located at the bottom of the page. 3.1.5 In order to emphasize that the fixed-position base forms a reference for the remainder of the lamp, it shall be shown as

39、 a solid, not dashed, line. If contact-making gauge dimensions per section 3.2 are shown, it should be made obvious that the base is not defined by the width and height constants but lies within that area. Use of the shortest rim location from Table 2 or 3 as a typical base rim will help clanfy that

40、 point. 3.2 Lamp positioning Lamp positioning and space allotment in the base-rim to bulb-seal area are defined by the size of the appropriate base “contact-making gauge“. This gauge insures that the dimensions in this area are not such that they would prevent a lamp from entering a socket properly

41、and making electrical contact. The base width constant, height constant, first and second angles are parameters of certain gauges. 3.2.1 Unless otherwise indicated on a lamp space drawing, lamps are compatible with the appropriate contact-making gauge. Although ready reference numbers are given in T

42、ables 2 and 3 it may be necessary to refer to the particular gauge Standard Sheet in question. Gauge numbers are also shown in the table. 3.22 The primary purpose of the width and height constants is to locate fwed positions from which the bulbs seal slope limiting angles can be drawn. Certain gauge

43、 complications can be neglected as long as the slope limits can be defined. 3.3 Eccentricity “Eccentricity“, as used in this standard, relates to the angular displacement of the bulb relative to the fixed- position base. It includes two conditions of physical displacement. Angular displacement from

44、the axis of the base is termed skewness. A second condition is true eccentricity or off centeredness. Skewness occurs from the center at the rim of the base as a reference. The eccentric condition throws this center off from the base axis. By the use of the ID/2 point, see Figure 1, as the apex of t

45、he angular displacement, both conditions are acknowledged; the skewness angle plus lateral displacement at the base rim. 3.3.1 The ID/2 method was chosen some time ago and has appeared as a notation on standards published since 1966. This ID12 distance is one-half the inside diameter of the particul

46、ar base type. Constant values have been agreed upon and are noted in Tables 2 and 3. The ID12 point is related to the rim of the base and not necessarily to a specific dimension of a contact-making gauge. 3.3.2 The worst case occurs with the shortest base and this also is shown in Table 2 and 3 as a

47、n aid in locating the desired point. As a simplification, the Apex Point can be used. It is derived from the Eyelet to Skirt Rim (ESR) dimension of the shortest base and the IDE value: AP = ESR-ID/2 This distance is shown in Tables 2 and 3, also. 3.3.3 An “eccentricity“ angle of 3“ is generally appr

48、opriate for most household incandescent lamps, but other values may be necessary for long slender lamps. For special situations an Ud ratio shall be calculated. IL“ is the greatest distance from the base rim to the bulbs major diameter or upper minor diameter. The “d“ As an example, see American Nat

49、ional Standard Specifications for EMc Lamp Gauges, ANSI c81.631991, Std. Sheet 3-165. 2 Copyright Q 1997 by National Electrical Manufacturers Association 1300 North 17th Street, Suite 1847, Rossiyn, VA 22209 First Edition May 1997 STD-NEMA C7B.30-ENGL 1797 b470247 0513207 57T m Ud Ratio LE STD-NEMA C78.30-ENGL 1997 b4702Li7 0513225 732 D ANSI C78.30-1997 R MAX o AMP TH CL-2 GAGE UPPER ANGLE(S) t EASE HEIGHT CONSTAN1 i!. CL-2 REFERENCE PLANE BASE ID/2 FROM BASE RIM I APEX POINT d EBP!SE WIDTH 4 CONSTANT Figure 6 - Location of reference p