CSA C22 2 NO 295-2015 Neutral grounding devices (First Edition).pdf

1、C22.2 No. 295-15Neutral grounding devicesLegal Notice for StandardsCanadian Standards Association (operating as “CSA Group”) develops standards through a consensus standards development process approved by the Standards Council of Canada. This process brings together volunteers representing varied v

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18、ate ServiceC22.2 No. 295-15September 2015Title: Neutral grounding devicesTo register for e-mail notification about any updates to this publication go to shop.csa.ca click on CSA Update ServiceThe List ID that you will need to register for updates to this publication is 2423602.If you require assista

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21、00-463-6727 or 416-747-4044.TMA trade-mar k of the Canadian S tandards Association, operating as “CSA Group”Neutral grounding devicesC22.2 No. 295-15C22.2 No. 295-15Neutral grounding devicesSeptember 2015 2015 CSA Group 1ContentsTechnical Committee on Industrial Products 2Subcommittee on Neutral Gro

22、unding Devices 4Preface 51 Scope 62 Reference publications 63 Definitions 74 Construction requirements 74.1 General 74.2 Components 84.3 Enclosures 84.4 Bonding and grounding 104.5 Neutral and ground connections 104.6 Wiring and wire bending space 114.7 Internal wiring 134.8 Electrical spacings 134.

23、9 Low-voltage assemblies 144.10 High-voltage assemblies 155 Markings 165.1 Common markings for all assemblies 165.2 Additional marking requirements for high-voltage assemblies 186 Tests 186.1 General 186.2 Rated voltage test 196.3 Temperature rise test 196.3.1 Continuously rated devices 196.3.2 Duty

24、 rated devices 196.3.3 Testing considerations 206.4 Resistor burnout test 216.5 Dielectric strength Low-voltage assemblies 216.6 Dielectric strength High-voltage assemblies 216.7 Bonding impedance 21Annex A (normative) Requirements for components 29Annex B (informative) Method for conducting tempera

25、ture tests 30Annex C (normative) Minimum requirements for ground circuit continuity detection 32C22.2 No. 295-15Neutral grounding devicesSeptember 2015 2015 CSA Group 2Technical Committee on Industrial ProductsR.M. Bartholomew Electric Power Equipment Ltd., Vancouver, British Columbia Category: Prod

26、ucer InterestChairR.P. de Lhorbe Schneider Electric Canada, Inc., Richmond, British Columbia Category: Producer InterestVice-ChairB.M. Baldwin Saskatoon, Saskatchewan Category: Producer InterestW.J. Bryans Electro-Federation Canada, Toronto, Ontario AssociateR.B. Buckler ASCO Power Technologies Cana

27、da, Brantford, Ontario AssociateW.J. Burr Burr and Associates, Campbell River, British Columbia AssociateC.C. Cormier Alberta Municipal Affairs, Edmonton, Alberta Category: Regulatory AuthorityP.D. den Bakker Shell Global Solutions Canada, Calgary, Alberta AssociateS.W. Douglas International Associa

28、tion of Electrical Inspectors, Toronto, Ontario AssociateJ.H. Dymond Peterborough, Ontario AssociateV.V. Gagachev Eaton, Burlington, Ontario Category: Producer InterestR.J. Kelly Government of Nunavut Department of Community it is intended that future editions will incorporate requirements for other

29、 neutral grounding devices as well.For general information on the Standards of the Canadian Electrical Code, Part II, see the Preface of CAN/CSA-C22.2 No. 0.This Standard is considered suitable for use for conformity assessment within the stated scope of the Standard.This Standard was prepared by th

30、e Subcommittee on Neutral Grounding Devices, under the jurisdiction of the Technical Committee on Industrial Products and the Strategic Steering Committee on Requirements for Electrical Safety, and has been formally approved by the Technical Committee.Interpretations: The Strategic Steering Committe

31、e on Requirements for Electrical Safety has provided the following direction for the interpretation of standards under its jurisdiction: “The literal text shall be used in judging compliance of products with the safety requirements of this Standard. When the literal text cannot be applied to the pro

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39、ed change; andd) rationale for the change.C22.2 No. 295-15Neutral grounding devicesSeptember 2015 2015 CSA Group 6C22.2 No. 295-15Neutral grounding devices1 Scope1.1 This Standard applies to assemblies of resistors, enclosures, and other components that provide high impedance grounding for the purpo

40、se of controlling the ground fault current or the voltage to ground of an alternating current system, when installed in accordance with the Canadian Electrical Code, Part I.1.2 This Standard applies to neutral grounding resistor assemblies rated for use on nominal voltage systems of 72 kV and less.1

41、.3 Neutral grounding resistor assemblies may be of an open type for mounting in other equipment.1.4 Neutral grounding assemblies may contain components and circuits for sensing and signalling.1.5 In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged t

42、o satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.Notes accompanying clauses do not include requirements or alte

43、rnative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.Notes to tables and figures are considered part of the table or figure and may be written as requirements.Annexes are designated normative (mandatory) or informative (no

44、n-mandatory) to define their application.2 Reference publicationsThis Standard refers to the following publications, and where such reference is made, it shall be to the edition listed below, including all amendments published thereto.CSA GroupC22.1-15 Canadian Electrical Code, Part ICAN/CSA-C22.2 N

45、o. 0-10 (R2015) General Requirements - Canadian Electrical Code, Part IIC22.2 No. 295-15Neutral grounding devicesSeptember 2015 2015 CSA Group 7CAN/CSA-C22.2 No. 0.4-04 (R2013) Bonding of electrical equipmentC22.2 No. 0.5-1982 (R2012) Threaded conduit entriesC22.2 No. 0.12-M1985 (R2012) Wiring space

46、 and wire bending space in enclosures for equipment rated 750 V or lessC22.2 No. 14-13 Industrial control equipmentC22.2 No. 65-13 Wire connectorsCAN/CSA-C22.2 No. 94.2-07 (R2012) Enclosures for electrical equipment, environmental considerations3 DefinitionsThe following definitions shall apply in t

47、his Standard:Assemblies an integrated grouping of resistors, enclosures, and other components that provide high impedance grounding for the purpose of controlling the ground fault current or the voltage to ground of an alternating current system, when installed in accordance with the Canadian Electr

48、ical Code, Part I.Continuous rating the maximum constant current that can be carried by the resistor continuously without exceeding established temperature rise limitations under specified conditions.Non-continuous rating the time during which the resistor will carry its rated thermal current withou

49、t exceeding established temperature rise limitations under specified conditions.4 Construction requirements4.1 General4.1.1 General requirements applicable to this Standard are given in the latest edition of CAN/CSA-C22.2 No. 0.4.1.2 Neutral grounding resistor assemblies shall be rated as follows:a) Voltage: The rated voltage shall be taken equal to the line to neutral voltage.b) Current: The basis for this rating shall be the thermal current. This will be the current through the neutral device during a ground fault condition at the device locati