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1、J IS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association (JEWA/JSA) Low voltage panelboards for household use ICs 29.130.20; 91.140.50 Reference number : JIS C 8328 : 2003 (E) PROTECTED BY COPYRIGHT 14 S Copyright Japanese Standards Association Provided by IHS un
2、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- C 8328 : 2003 Foreword This translation has been made based on the original Japanese Industrial Standard revised by t
3、he Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by the Japan Electrical Wiring Devices and Equipment Industries Association (JEWA)/the Japanese Standards
4、Association (JSA) with the draft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Consequently JIS C 8328 : 1995 is replaced with this Standard. Attention is drawn to the possibility
5、 that some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industria
6、l Standards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. Date of Establishment: 1978-11-
7、01 Date of Revision: 2003-05-20 Date of Public Notice in Official Gazette: 2003-05-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Electricity Technology JIS C 8328 : 2003, First English edition published in 2003-10 Translated and published by: Japa
8、nese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in a
9、ny form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wi
10、ng, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- C 8328 : 2003 Contents 1 2 3 4 5 6 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 8 . 9 Page Scope 1 Normative references 1 Definitions 1 Standard service
11、 conditions . 3 Classification 3 4 Rating and number of branch circuits Performance Temperature rise . Insulation resistance . Dielectric withstand voltage Resistance to heat . Cover retention force Mechanical strength of cabinet . Strength of terminal part Flame retardance . Opening and closing per
12、formances of door . Construction, dimensions and materials . Construction in general Main switch and branch switch Mounting part of current limiter Bus bar and branch conductor Joints of conductors External wiring terminal . Prevention of contact with live part Insulation distance Earth terminal . 5
13、 5 5 5 5 5 5 5 5 6 6 6 6 7 7 9 10 10 11 11 8.10 Branch conductor earth terminal . 11 8.11 Operating part for switching . 12 PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15
14、/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- C 8328 : 2003 8.12 8.13 8.14 8.15 8.16 8.17 8.18 8.19 8.20 8.21 9 9.1 9.2 9.3 9.4 9.5 9.6 9.7 9.8 9.9 Measures for insulation resistance measurement . Metallic cabinet Cabinet of synthetic resin Intermediate bas
15、e Metallic base plate Gutter Wiring hole . Indication of branch circuits . Indication of 200 V circuit . Materials . Test methods Test place Construction test . Temperature rise test . Insulation resistance test . Dielectric withstand voltage test Heat resistance test Cover retention force test Stre
16、ngth test of cabinet Strength test of terminal part 9.10 Flame retardance test of cabinet 9.11 Opening and closing test of door 10 Inspection 10.1 Type inspection 10.2 Acceptance inspection . 11 Designation of product . 12 Marking . 12 12 13 13 13 13 16 16 16 16 16 16 16 16 17 17 17 18 18 18 18 19 1
17、9 19 19 19 20 (ii) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTR
18、IAL STANDARD JIS C 8328 : 2003 Low voltage panelboards for household use 1 Scope This Japanese Industrial Standard specifies low voltage panelboards for household use (hereafter referred to as “household panelboards”) with the rated cur- rent not exceeding 150 A intended for use in houses or the lik
19、e, as the entrance ser- vice apparatus for electric circuit of 100 V a.c. single phase two-wire system or 100/ 200 V a.c. single-phase three-wire system at a frequency 50 Hz or 60 Hz. Remarks 1 The above-mentioned “houses or the like” includes shop, office, etc. in addition to houses. 2 Panelboards
20、of such special construction as waterproof type and ex- plosion-proof type are excluded. 2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendment
21、s) indicated below shall be applied. JIS C 3307 600 V Polyvinyl chloride insulated wires JIS C 3317 600 V Grade heat-resistant polyvinyl chloride insulated wires JIS C 8306 Testing methods for wiring devices JIS C 8370 Molded case circuit breakers (MCCB) JIS C 8371 Residual current operated circuit
22、breakers JIS C 8480 Box-type switchgear assemblies for low-voltage distribution purpose JIS Z 8703 Standard atmospheric conditions for testing 3 Definitions given in JIS C 8480, the following principal definitions apply: For the purposes of this Standard, in addition to the definitions panelboard fo
23、r household use (household panelboard) A cabinet in which the whole or a part of the main switch, branch switches, residual current oper- ated circuit breaker, etc. (hereafter referred to as “internal apparatus”) are as- sembled. There are two kinds in household panelboards, i.e. one provides and th
24、e other does not provide set up space of current limiter (hereafter referred to as uL-space7). rated current of household panelboard The current marked on a house- hold panelboard (it means the current which can be passed continuously with the temperature rise of bus bar not exceeding the specified
25、value). rated voltage of household panelboard The voltage marked on a house- hold panelboard (it means standard voltage of the electric circuit). cabinet A container which accommodates the internal apparatus. There are two kinds, i.e. one with cover and the other with door, and each composed of the
26、following articles: PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 C 8328 : 2003
27、 1) cabinet with cover: Box, cover, intermediate base (1) 2) cabinet with door: Box, front plate(11, cover(l), door(1), intermediate lidtl), intermediate base (1) Note ( 1 ) Some cabinets lack this part. Remarks : Cabinets with cover and door are included in those with door. box A part of a househol
28、d panelboard which forms the walls of the top, bot- tom, right and left sides as well as the rear face of the board. cover A part of the household panelboard which is so constructed that it cov- ers the front of the panelboard entirely, and the switching operation of the in- ternal apparatus can be
29、made without removing it. door A part of household panelboard which is supported by the box or the like by means of hinge so that it can be opened and closed, and covers the front of the cabinet. intermediate base A mounting plate for mounting the internal apparatus. The internal apparatus are assem
30、bled on the intermediate base and then Fixed in the box as one body. intermediate lid The plate which is prepared behind the door to cover the live parts. It is so constituted that the switching operation of the internal ap- paratus can be made without removing it. front plate The part which covers
31、the front of household panelboard, other than door, intermediate lid and cover. surface type A type of panelboard construction which allows installation with the box entirely or partly exposed from the structural surface. flush type A type of panelboard construction which allows installation with th
32、e box entirely recessed into the structure. common type for surface and flush mounting A type of panelboard con- struction which allows installation for either of surface or flush type. main switch A residual current operated circuit breaker fitted to the power side of the bus bar (in some cases a m
33、oulded case circuit breaker). branch switch A switch equipped with an overcurrent release, which is Fit- ted to each branch circuit from the bus bar. protection against lack of neutral line in single-phase three-wire sys- tem In some cases the load side apparatus may be burnt due to application of o
34、vervoltage which may appear according to the conditions of the load side cir- cuits when the neutral line in a single-phase three-wire system is lost for any reason. This system interrupts the circuit by detection of voltage imbalance to prevent damage to the apparatus. bus bar The electric conducto
35、r in a household panelboard, other than branch conductor, that supplies electric power to two or more branch switches. branch conductor The electric conductor to be connected between the bus bar and the branch switch. PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS un
36、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 C 8328 : 2003 s) gutter The space in a household panelboard that is prepared for receiving wiring from the outside.
37、 t) number of branch circuits hold panelboard. u) panelboard with additional circuit space A household panelboard wherein fitting spaces, fitting parts to install additional branch switches, and branch conductors for connection with additional branch switches are prepared. external wiring terminal T
38、his means the place where connection with ex- ternal wiring is made. Terminals of internal apparatus, connections between bus bars to each other and bus bar and branch conductors are excluded. Number of branch switches fitted in a house- v) w) x) earth terminal A terminal for connection with an eart
39、hing conductor. branch conductor earth terminal A terminal for connection with an earthed branch conductor (wiring of earthed pole to be connected to earthed plug socket or the like). instantaneous breaking function for protection against short circuit of cord Such instantaneous tripping function to
40、 be provided in a panelboard in addition to its long-term tripping characteristic that the instantaneous operat- ing characteristic falls in the effective range for protection against short circuit by arc of the cord. y) 4 Standard service conditions Unless otherwise specified, the standard service
41、conditions of household panelboards shall be as follows: a) The ambient temperature shall be within the range of highest temperature 40 O C and lowest temperature -5 O C . The average value over 24 h shall not exceed 35 OC. b) The altitude shall not exceed 2 O00 m. c) d) e) The relative humidity sha
42、ll be within the range of 45 % to 85 %. Such a state that the board will not receive abnormal vibration or shock. Such an atmosphere that there is no excess steam, oil vapour, smoke, dust, salt, or corrosive substances. 6 Classification The household panelboards are classified as follows: a) They ar
43、e classified in accordance with the materials of enclosure (box, cover, front plate and door) constituting the cabinet, as follows: 1) Made of synthetic resins. 2) Made of metals. 3) They are classified in accordance with the type of cabinets, as follows: 1) 2) With cover. Combination of above-menti
44、oned 1) and 2). b) With door (inclusive of combination of cover and door). PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 19:31:28 MDTNo reproduction or networking p
45、ermitted without license from IHS -,-,- 4 C 8328 : 2003 Rated current of household panelboard c) They are classified in accordance with the installation system, as follows: 1) Surface type. 2) Flush type. Existence Rated of main current of switch main switch 3) They are classified in accordance with
46、 existence of L-space, as follows: 1) With L-space. 2) Without L-space. They are classified in accordance with existence or non-existence of main switch, as follows: 1) Without main switch. 2) Common type for surface and flush mounting. d) e) With main switch. In this case, further classification is
47、 made in accor- dance with the name of main switch used, as follows: 2.1) Residual current operated circuit breaker (ones with protection against lack of neutral line in single-phase three-wire system). 2.2) Moulded case circuit breaker. V 6 Rating and number of branch circuits The phase, wire syste
48、m, rated volt- age, rated current of household panelboard, existence of main switch, rated current of main switch and number of branch circuits shall be as given in Table 1. A A Table 1 Rating and number of branch circuits Single-phase two-wire system 100 Single-phase three-wire system Phase, wire system and rated voltage 2, 3, 4, 5, 6 30 None - Exist 30 2, 3, 4, 5, 6, 8 4 7 5, 6 30 None - Exist 30 4, 5, 6, 8, 10, 12 60 Number of branch circuits (2) None - 75 100 150 Exist 40 50,60 75 75,100 100, 125, 150 4, 5, 6, 8, 10, 12, 14, 16, 18, 20 6, 8, 10, 12, 14, 16,