1、C22.2 No. 229-M1988(reaffirmed 2014)Switching and Metering CentresGeneral Instruction No. 2 C22.2 No. 229-Mi 988 April i994 CSA Standard C22.2 No. 229-Mi 988, Switching and Metering Centres, was published in July 1 988; it consisted of 38 pages, each dated July 1988. Amendments to Clauses 4.8.1 and
2、4.12.2 and Table 5 have been formally approved and are incorporated (and identified by a vertical line in the margin) in the attached replacement pages. CSA Standard C22.2 No. 229-Mi 988 now consists of the following pages: 314, 17, 18, 2132, 37, and 38 dated July 1988; and 15, 16, 19, 20, and 3336
3、dated April 1994. These replacement pages are to be inserted into your copy of the Standard; the pages replaced should be kept for reference. 4.5 Main Switch, Circuit Breaker, Mains Terminal, or Subfeed Terminal Section 4.5.1 A main switch or circuit breaker section shall conform to the applicable r
4、equirements of CSA Standards C22.2 No. 4 or C22.2 No. 5, respectively, and the current rating shall not exceed that of the main busbars. 4.5.2 Where a main switch or circuit breaker section is intended to be used as a service box, it shall comply with the requirements for this application as specifi
5、ed in CSA Standards C22.2 No. 4 or C22.2 No. 5, respectively. 4.5.3 A mains terminal section shall be provided with wiring terminals complying with Clause 4.8 as required for the termination of the supply conductors. 4.5.4 Subfeed connections shall be permitted in a mains terminal section except the
6、y shall not be permitted in a mains switch or circuit breaker section, intended for service use. 4.5.5 A subfeed terminal section shall be permitted at the end of the main busbars remote from the supply end. 4.6 Circuit Breakers and Fusible Switches 4.6.1 Circuit breakers shall comply with CSA Stand
7、ard C22.2 No. 5 and fusible switches shall comply with CSA Standard C22.2 No. 4. 4.6.2 Circuit breakers shall be 2- or 3-pole common trip. 4.6.3 There shall be provision for locking circuit breakers and fusible switches only in the OFF position. 4.6.4 If it is intended that ci,rcuit breakers or fusi
8、ble switches be field installed, the centre shall be marked as specified in Clause 5.3(b). 4.6.5 If a circuit breaker or fusible switch is connected to a meter- mounting device by insulated wire conductors, means shall be provided to prevent the conductors from contacting bare live parts. 4.6.6 Exce
9、pt as permitted by Clauses 4.6.7 and 4.7.4, each circuit breaker shall be located in a separate compartment. C22.2 No. 229M1988 April 1994 Page 15 (Replaces p. 15, July 1988) 4.6.7 Where all circuit breakers are grouped together, they shall be located in a separate compartment. 4 . 6 . 8 The fusible
10、 switch for each subcircuit shall be located in a separate compartment with a hinged cover that can be sealed in the closed position. The separate compartments shall have no openings between adjacent switching compartments. 4.7 Meter-Mounting Devices 4.7.1 Except as permitted by Clause 4.7.4, each m
11、eter-mounting device shall be located in a separate compartment with its own cover. 4.7.2 Each meter-mounting device shall comply with the applicable requirements of CSA Standard C22.2 No. 115. 4.7.3 If a 5-terminal meter-mounting device is intended for use in a 3- phase circuit, the fifth terminal
12、shall be equivalent in size to the other terminals of the device. 4.7.4 A meter-mounting device and its associated circuit breaker shall be permitted to be located in the same compartment, if provided with its own cover. 4.8 Wiring Terminals 4.8.1 Except as permitted by Clause 4.9, metering centres
13、shall be provided with field-wiring terminals suitable for the connection of conductor sizes selected from the 75C column of Table 2 or 4 of the Canadian Electrical Code, Part I, except that for circuit breaker terminals rated 125 A or less and marked for use with 60C wire only, the conductor sizes
14、shall be selected from the 60C column of the Tables. 4.8.2 Wire connectors shall comply with the requirements for pressure type connectors as specified in CSA Standard C22.2 No. 65. 4.8.3 A separate terminal shall be provided for the connection of each circuit neutral conductor and shall be identifi
15、ed as required by CSA Standard C22.2 No. 0. 4.8.4 In a 3-phase assembly, if a circuit breaker or a fusible switch is 2-pole and is connected to a 5-terminal meter-mounting device, the neutral shall also contain a terminal for connection of the potential lead to the potential terminal of the meter-mo
16、unting device and shall accommodate a No. 12 conductor. C22.2 No. 229M1988 April 1994 Page 16 (Replaces p. 16, July 1988) as listed in column 3 of Table 10 in the Canadian Electrical Code, Part I, using the smaller of the two dimensions shown for No. 12 AWG wire. (b) Conductors connecting to a mould
17、ed-case circuit breaker I rated 125 A or less and marked as suitable for use with 60/75C wire shall be 60C wire unless a marking is provided to indicate that the use of 75C wire is intended. (c) Where terminals are marked as suitable for either copper or aluminum wire, wiring space and wire-bending
18、space suitable for aluminum wire shall be provided. Cd) Where multiple conductors in parallel are intended to be used, it shall be assumed that they will be run in separate conduits. (e) Where a terminal is suitable for use with a single conductor or two or more conductors in parallel, the arrangeme
19、nt requiring the larger space shall be assumed. (f) A full complement of circuit devices necessitating the largest wiring space and wire-bending space shall be assumed. (g) The largest conductor for which the equipment is marked. 4.12 .3 Uninsulated live parts shall not be located in a wiring space
20、for field-installed conductors if one or more of the conductors may be of a polarity different to that of the uninsulated live part. 4.12.4 The minimum wiring space between the bottom of an enclosure where conduit or other raceways may enter and insulated or uninsulated busbars shall be (a) 254 mm f
21、or uninsulated busbars; and (b) 114 mm for insulated busbars, busbar supports, and other obstructions. 4.13* Short-Circuit Current Rating *Effective Date-See Foreword for exception. 4.13.1 The short-circuit current rating of a centre shall be one or more of the following values: 5, 7.5, 10, 14, 18,
22、22, 25, 30, 35, 42, 50, 65, 85, 100, 125, 150, or 200 rms symmetrical kA. 4.13.2 If the maximum peak let-through current, through a meter-mounting device, exceeds 30 000 A, the device shall be connected to the secondary sides of current transformers. 4.13.3 Except as permitted by Clauses 4.13.4 to 4
23、.13.6, the short- - circuit current rating of a switching and metering section shall not exceed (a) the current interrupting or short-circuit withstand rating of any device specified to be installed therein; or (b) the current interrupting or short-circuit withstand rating of the remote overcurrent
24、protective device with which it is specified to be used. C22.2 No. 229Ml988 April 1994 Page 19 (Replaces p. 19, July 1988) 4.13.4 Circuit breakers connected to the load side of an integral main overcurrent protective device shall be permitted to have current interrupting ratings less than the short-
25、circuit current rating of the centre, if the combination is tested as specified in Clause 6.4.1.1 or the centre complies with Clause 6.4.1.2 and is marked as required by Clause 5.3. 4 .13 .5 Circuit breakers or the main circuit breaker, if provided, or both, shall be permitted to have current-interr
26、upting ratings less than the short-circuit current rating of the centre if the centre is intended for use at this short-circuit rating only when connected to the load side of a separately installed overcurrent protective device having a current-interrupting rating not less than the short-circuit cur
27、rent rating of the centre, and if the combination is tested as specified in Clause 6.4.1.1 or the centre complies with Clause 6.4.1.3 and is marked as required by Clause 5.3. 4 .13 . 6 The short-circuit current rating of a centre shall be permitted to exceed the current interrupting or short-circuit
28、 withstand rating of some of the devices specified to be installed in it if the centre is marked as specified in Clause 5.3(e). 5. Marking 5.1 A centre shall be marked, in a permanent manner, where the details can be readily seen after installation, with the following: (a) the manufacturers name, tr
29、adename, or other recognized symbol of identification; (b) the catalogue number, type designation, or other mark used for identification; (c) the maximum rated voltage; (d) the ampere rating of main busbars; (e) the ampere rating of metering secti.on busbars; (f) the ampere rating of neutral busbars
30、 if less than that of the ungrounded busbars; (g) the number of phases; (h) when tested as specified in Clause 6.4, the short-circuit current rating(s) and the maximum voltage rating for each short- circuit rating exceeding 5 kA; and (i) if suitable for service entrance equipment. 5.2 The applicable
31、 marking specified in Clause 5.1 shall appear on each terminal section, elbow, metering section, and main busbar. C22.2 No. 229M1988 April 1994 Page 20 (Replaces p. 20, July 1988) Table 3 Thickness of Sheet Metal for Covers, Fronts, and Doors (See Clause 4.2.2.2.) Maximum dimensions Minimum thicknes
32、s based on maximum dimensions, mm Steel Aluminum Linear, mm Area, mm2 Zinc coated tjncoated 178 457 610 1020 1520 1520 20 87 230 254 970 970 600 000 000 000 000 000 1.43 1.34 1.43 1.34 1.43 1.34 1.79 1.69 2.47 2.30 3.23 3.11 1.85 1.85 1.85 2.33 3.03 3.81 Table 4 Minimum Electrical Spacings (See Clau
33、se 4.11.1.) Spacing, mm Between bare live Voltage between parts involved, Between bare of different live parts polarity parts and non- current-carrying metal parts bonded to ground, through V Through air Over surface air or over surface 125 or less 12.7 19.1 12.7 126250 19.1 31.7 12.7 251600 25.4 50
34、.8 25* *A through-air spacing of not less than 12.5 mm between bare live parts and non-current-carrying metal parts bonded to ground, other than the enclosure, is acceptable at circuit breakers, switches, or neutrals. C22.2 No. 229-M1988 - April 1994 - Page 33 (Replaces p. 33, July 1988) Table 5 Max
35、imum Temperature Rises, C (See Clauses 5.4 and 6.2.1.) When tested with live or dummy synthetic circuit Materials and components fuses* fusest breakers Busbars 1. Within 152 mm of a fuseholder 30 50 along the current path 2. Unplated busbars and joints other 30 50 50 than those covered in Item 1 3.
36、Plated busbars at point of 55Th connection to a circuit breaker 4. Plated busbars other than as 45 65 65 covered in Items 1 and 3 Wiring terminals 5. Field-wiring terminals except as 30 50 50 covered in Items 6, 7, and 8 6. For field wiring to switches and 45 50 50 circuit breakers except as covered
37、 in Item 7 7. For field wiring to circuit 65* breakers rated 125 A or less and marked for use with 75C wire 8. For field wiring to switches 65 rated 100 A or less and tested with T fuses 9. For field wiring terminals on 50 50 50 meter-mounting devices 10. For internal wiring 45tt 60tt 60ThTh Insulat
38、ing materialgS 11. Wiring insulation or insulating 15 35 35 tubing 12. Electrical tape 35 55 55 13. Varnished cloth insulation 40 60 60 14. Fibre employed as electrical 45 65 65 insulation 15. Sealing compound* 30 50 50 16. Phenolic composition employed as 105 125 125 electrical insulation *Duy fuse
39、s shall be as specified in CSA Standard C22.2 No. 39. tSynthetic fuses shall be as specified in CSA Standard C22.2 No. 29. ThA temperature rise of 65C shall be permitted at the point of connection to a circuit breaker (a) marked as suitable for continuous operation at 100% of its rating and loaded a
40、t 100% rating in the test; or (Continued) C22.2 No. 229-Ml988 - April 1994 - Page 34 (Replaces p. 34, July 1988) (b) rated 125 A or less, marked as suitable for operation with 75C wire, and connected with 75C wire for the test. A temperature rise of 60C shall be permitted when tested in accordance w
41、ith Clause 6.2.3.4(b) or 6.2.3.4(d) if marked as specified in Clause 5.4. *Applicable to a connector for copper wire. Also applicable to a connector for aluminum wire or to an aluminumbodied connector, provided that these connectors have a 90C temperature rating. ttlf aluminum wire is used and the t
42、emperature rise exceeds 30C, connectors suitable for the higher temperature shall be used. ttlf aluminum wire is used and the temperature rise exceeds 50C, connectors suitable for the higher temperature shall be used. These limitations do not apply to insulated conductors or other materials that hav
43、e been investigated and found acceptable for higher temperatures. The softening point shall be at least 40C higher than the temperature rise at the point where the compound is used, but not less than 90C. Table 6 Power Factor (See Clause 6.4.2.24.) Short-circuit current symmetrical amperes Maximum p
44、ower factor 010 000 0.5 10 00120 000 0 .3 20 001 and higher 0 .2 C22.2 No. 229M1988 - April 1994 Page 35 (Replaces p. 35, July 1988) Enclosure Supply rated voltage, 3 phase 60 Hertz Legend: 1 = closing switch 2 = variable tap air core reactors 3 = variable resistors 4 = test station terminals 5 = li
45、ne leads 6 = externally mounted fuseholder (see Clause 6.4.2.6) 7 = separate main overcurrent protective device 8 centre line terminals 9 = main circuit breaker or fusible switch (for locations of main fuses see Clause 6.4.2.6) 10 = circuit breaker 11 = circuit fusible switch with dummy fuses 12 = f
46、uses (see Clause 6.4.2.6) 13 instrument shunts, if needed 14 grounding connection 15 = see Clause 6.4.2.9 16 = watt hour meter Figure 1 Test Circuit Wiring Diagram (See Clause 6.4.2.13.) C22.2 No. 229M1988 April 1994 Page 36 (Replaces p. 36, July 1988) General Instruction No. 1C22.2 No. 229-M1988Jul
47、y 1988Title: Switching and Metering CentresPagination: 38 pages, each dated July 1988To register for e-mail notification about any updates to this publicationgo to shop.csa.caclick on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2002328.If you requi
48、re assistance, please e-mail techsupportcsagroup.org or call 416-747-2233.Visit CSA Groups policy on privacy at csagroup.org/legal to find out how we protect your personal information.Blank pageC22.2 No. 229-M1988 Switching and Metering Centres Industrial Products Forming Part of Canadian Electrical
49、 Code, Part II Safety Standards for Electrical Equipment ISSN 0317-5669 Published in July 1988 by Canadian Standards Association (Incorporated 1919) 178 Rexdale Boulevard Rexdale (Toronto), Ontario Canada M9WIR3 Canadian Standards Association Contents Technical Committee on Industrial Products 4 Subcommittee on C22.2 No. 229 5 Preface 6 Foreword 7 1. Scope 9 2. Definitions 9 3. General Requirements 10 4. Construction 11 4.1 General 11 4.2 Enclosures (General) 11 4.3 Busbars 14 4.4 Supports for Bare Live Parts 14 4.5 Main Switch
