Canadian Electrical Code, Part I Full Impact Assessment

Transcription

1 Copyright CSA Group 2015 Canadian Electrical Code, Part I Full Impact Assessment Subject 3738 Alignment of conductor ampacity selection

2 CONTENTS 1 INTRODUCTION TO THE FULL IMPACT ASSESSMENT PURPOSE OF THE FULL IMPACT ASSESSMENT BACKGROUND OF THE CHANGE THE NATURE OF THE CHANGE The change How is it different from the status quo? PURPOSE/REASON FOR THE CHANGE What is the issue that the change is intended to address? How does the change accomplish the desired results? What are the implications/consequences if action is not taken? WHY IS ACTION REQUIRED AT THIS TIME? (14) PREVALENCE OF RULE USE IF ACCEPTED IMPACT ON KEY STAKEHOLDERS (16) Largest type of stakeholder who would benefit (24) Largest type of stakeholder who would be negatively affected (15) Other stakeholders affected on a frequent basis Is the proposed change limited to a specific group/geographic area? What is the affected stakeholders readiness to act on the change(s)? Recommended stakeholder management strategy Communication and implementation plan ANALYSIS OF ANTICIPATED ECONOMIC IMPACT (20) The jurisdiction or stakeholder s ability to compete, based on incompatibility with other standards (21) Complexity of implementation (is training required to implement the Rule?) (22) Total costs to implement (for example, cost to install, educate, manufacture, inspect, purchase additional product, and of the increased use of electricity) IMPACT ON BUSINESS: LARGE AND SMALL (IF APPLICABLE) WHAT IS THE PRACTICE/EXPERIENCE IN OTHER JURISDICTIONS? Are standards consistent with (or lesser/greater than) other jurisdictions? (23) Conflict with other Ministries or Codes Consequences for other Departments/Ministries, e.g., apprentice training... 9 Page 1 17/12/2014

3 11.4 Consequences for other Codes from other jurisdictions (US, European standards) CONSULTATION PROCESS PROPOSED EFFECTIVE DATE OF CHANGES APPENDIX 1 CODE RANKING TOOL VALUES Page 2 17/12/2014

4 1 INTRODUCTION TO THE FULL IMPACT ASSESSMENT Canadian Electrical Code, Part I Full Impact Assessment The Full Impact Assessment follows the rationale of the Canadian Electrical Code Ranking Tool (CRT) and provides supporting information to validate the rankings of the CRT. It includes all the questions of the CRT either verbatim or modified. However, the scope of the Full Impact Assessment extends beyond that of the CRT and, therefore, the assessment includes additional questions that may help to substantiate the rankings. The CRT is referenced throughout the Full Impact Assessment. The questions from the CRT are identified in the Full Impact Assessment by numbers in parentheses. Whenever applicable, chapter titles also include references to the relevant sections of the CRT. The Full Impact Assessment follows the sequence of the CRT as closely as possible but, to enhance the analytical function of the document, risk-related and benefits-related questions have not been separated in the Full Impact Assessment. 2 PURPOSE OF THE FULL IMPACT ASSESSMENT The purpose of the Full Impact Assessment is to provide the provinces and territories with an enhanced rationale and detailed assessment of a particular change to the Canadian Electrical Code, Part I (CE Code, Part I). This assessment is submitted for review to provincial and territorial regulatory authorities to aid with their adoption process for the Code. Jurisdictions may decide to conduct further analyses or to hold additional consultations. 3 BACKGROUND OF THE CHANGE Section 4 is a general Section of the Code that sets out requirements for conductors. The intent of Rule is to correlate the temperature rating of conductors where the ampacity is selected from Tables 1 to 4 with the conductor termination temperature rating of electrical equipment or any wire connector (terminal connector, lug, etc.). It is intended by this Rule that the ampacity of conductors be selected from the temperature column in Table 1, 2, 3, or 4 that corresponds to the conductor termination temperature rating marked on the electrical equipment. During the 2012 revision of the Code, changes were made to Tables 1 to 4 with respect to calculated ampacities at 90 C. This change harmonized the applicable conductor requirements in the National Electrical Code (NEC) and the CE Code, Part I. Rule has been viewed as ambiguous because it specified a 90 C conductor termination temperature for all unmarked equipment. It has now been revised to include specific requirements, thus clarifying any ambiguities. Page 3 17/12/2014

5 4 THE NATURE OF THE CHANGE 4.1 The change (A) Revise Rule as follows: Temperature limitations (see Appendix B) (1) Where equipment is marked with a maximum conductor termination temperature, the minimum size of conductor used shall be based on the allowable ampacity in the temperature column in Table 1, 2, 3, or 4, with all relevant correction factors being applied as required by Rule 4-004, corresponding to the maximum termination temperature marked on the equipment. (2) For the purpose of Subrule (1), and except as provided for by other Rules of this Code, where the maximum conductor termination temperature for equipment is not marked, the maximum conductor termination temperature shall be considered to be (a) 60 C for equipment (i) rated not more than 100 A; or (ii) marked for use with No. 1 AWG or smaller conductors; and (b) 75 C for equipment (i) rated more than 100 A; or (ii) marked for use with conductors larger than No. 1 AWG. (3) Notwithstanding Subrule (2), for high-voltage equipment where conductor termination temperatures are not marked, it shall be permitted to consult the manufacturer to establish the permitted termination temperature. (4) Subrules (1) and (2) shall apply only to the first 1.2 m of conductor length measured from the point of termination on the equipment. (5) Where a cable transition is made to meet the requirements of Subrule (1) or (2), the length of a conductor terminating on equipment shall be not less than 1.2 m. (6) Where the conductor ampacity is selected from Tables D8A to D11B or from Table 12E, Subrules (1) and (2) shall apply. (B) Revise Appendix B Note to Rule and add a Note to Rule 4-006(4) and (5) as follows: Rule In accordance with CSA product Standards (e.g., CAN/CSA-C22.2 No. 4 or CSA C22.2 No. 5), when equipment of 600 V or less is evaluated relative to the appropriate temperature characteristics of the terminations, conductors sized similar to those in the 75 C column of Table 2 or 4 are used. It is intended by this Rule that the size of conductors terminating on equipment described in Subrules (1), (2), (3), and (4) be not less than the conductor size selected Page 4 17/12/2014

6 for the maximum conductor ampacity in the corresponding temperature column of Table 1, 2, 3, or 4. This Rule is not intended to address conductor allowable ampacity (see Rule 4-004). Regardless of conductor allowable ampacities determined by other Rules in this Code (for underground conductors, flexible cords, portable power cables, DLO cables, and conductors with higher temperature ratings, etc.), it is intended that the minimum conductor size be based on the requirements of this Rule. Rules 4-006(4) and (5) The 1.2 m length is based on test requirements from equipment Standards. 4.2 How is it different from the status quo? (A) Currently, Rule reads as follows: Temperature limitations (see Appendix B) (1) Where equipment is marked with a maximum conductor termination temperature, the maximum allowable ampacity of the conductor shall be based on the corresponding temperature column from Table 1, 2, 3, or 4. (2) Where equipment is not marked with a maximum conductor termination temperature, 90 C shall be used by default. (B) Currently, the Appendix B Note to Rule reads as follows: Rule The intent of this Rule is to correlate the temperature rating of conductors where the ampacity is selected from Tables 1 to 4 with the lowest temperature rating of electrical equipment or any wire connector (terminal connector, lug, etc.). It is intended by this Rule that the ampacity of conductors be selected from the temperature column in Table 1, 2, 3, or 4 that corresponds to the temperature rating marked on the electrical equipment. As an example, where a conductor is terminated on a breaker with a 75 C rating, the maximum conductor ampacity would be based on the 75 C column of the Tables. It should be noted that the temperature rating of a wire connector (terminal connector, lug, etc.) that is connected to the equipment may be higher than that of the equipment itself; it is the equipment rating that determines the conductor size, not the lug. Page 5 17/12/2014

7 5 PURPOSE/REASON FOR THE CHANGE 5.1 What is the issue that the change is intended to address? The change is intended to increase efficiency in the application of Code requirements by ensuring proper interconnection to equipment, allowing it to operate within the manufacturer s designed specifications and the product standard specifications. Failure to do so can lead to nuisance tripping of overcurrent devices, safety hazards, and equipment and property damage. 5.2 How does the change accomplish the desired results? Rule now specifies the maximum conductor termination temperature to be used for unmarked equipment, based on the conductor size compatible with the equipment. Subrules have been added to Rule to mandate compliance based on the first 1.2 m of conductor length, measured from the point of termination on the equipment, and to provide more detailed requirements based on equipment markings and ampere ratings. Exceptions have been made for unmarked high-voltage equipment, permitting consultation with the manufacturer in order to establish the permitted termination temperature. 5.3 What are the implications/consequences if action is not taken? If this change is not implemented, equipment may not perform according to the manufacturer s and certification performance specifications. This can result in nuisance tripping of overcurrent devices, safety hazards, and equipment and property damage. 6 WHY IS ACTION REQUIRED AT THIS TIME? This initiative is not driven by a particular deadline. 7 (14) PREVALENCE OF RULE USE IF ACCEPTED The change will affect the selection of conductors for interconnection with marked and unmarked equipment and is expected to be applied very frequently. 8 IMPACT ON KEY STAKEHOLDERS 8.1 (16) Largest type of stakeholder who would benefit The largest groups of stakeholders who will benefit from the change are the general public and homeowners and residents as well as industrial and commercial facility owners. Along with increased safety, property owners will benefit from enhanced equipment reliability coupled with lower equipment maintenance costs. Page 6 17/12/2014

8 8.2 (24) Largest type of stakeholder who would be negatively affected Residential, commercial, and industrial property owners will see an increase in installation costs. In some circumstances, larger conductor sizes and cable transitions will increase labour and material costs. 8.3 (15) Other stakeholders affected on a frequent basis The change will affect a broad range of stakeholder groups, as follows: Engineers/Designers: This stakeholder group will be directly affected by the change because it is their responsibility to specify conductor sizes at the design stage. This group is interested in providing cost-effective and safe designs and installation requirements to minimize the risk of injury to personnel, damage to facilities, and insurance and legal costs. As such, engineers/designers will need to receive a communication about the change (e.g., a formal letter from the authority having jurisdiction). Electrical contractors: This group of stakeholders is responsible for the application of the Code. As such, they need to be informed about changes to it to help ensure full compliance with its requirements. The updates can be delivered through formal training or through industry literature, depending on current practices in a particular jurisdiction. It is the responsibility of individual contractors to keep themselves informed about changes to the Code. Trainers: This is a broad group that may include those providing training to other stakeholder groups, such as electrical contractors and installers of equipment as well as repair and maintenance personnel where applicable. Training programs and literature, including electronic content, will need to be updated to include the change. Other standards development organizations (SDOs): All references to the provisions of the Code that are being changed will need to be updated in documents published by other SDOs. Provincial/territorial electrical regulatory authorities: This group of stakeholders is responsible for enforcement of the Code and will, therefore, need to be informed of changes to it. Insurance: Insurance policies contingent on following the Code will need to be updated. Builders: This group will need to be informed of the change because the new requirements will have to be implemented in new construction. Inspectors: This group of stakeholders is accountable for enforcing compliance with the Code and needs, therefore, to stay informed about changes to it. It is the responsibility of Page 7 17/12/2014

9 a particular province or territory to make the information on Code changes available to electrical inspectors. Depending on the practice in a particular jurisdiction, changes can be communicated through training (provided by the jurisdiction or a third party) or through jurisdiction-specific or national industry literature. 8.4 Is the proposed change limited to a specific group/geographic area? The change will have nationwide application. 8.5 What is the affected stakeholders readiness to act on the change(s)? Research has not revealed any evidence of the market not being ready to implement this change. 8.6 Recommended stakeholder management strategy Not applicable. 8.7 Communication and implementation plan Not applicable. 9 ANALYSIS OF ANTICIPATED ECONOMIC IMPACT 9.1 (20) The jurisdiction or stakeholder s ability to compete, based on incompatibility with other standards The change should not affect a jurisdiction s competitive position. 9.2 (21) Complexity of implementation (is training required to implement the Rule?) The change can be included as an update in existing training programs. No specific training is recommended to introduce the change. 9.3 (22) Total costs to implement (for example, cost to install, educate, manufacture, inspect, purchase additional product, and of the increased use of electricity) Certain applications of the change are expected to increase installation costs. For example, where the maximum conductor termination temperature for equipment is not marked, it is to be considered to be 60 C for equipment rated not more than 100 A or marked for use with No.1 AWG or smaller conductors. Under such circumstances, the conductor connecting to the equipment will probably have to be a larger size. Subrules (4) and (5) require the length of this Page 8 17/12/2014

10 larger conductor to be not less than 1.2 m, and allow for a cable transition to be made to meet the requirements. The increased size of the conductor, coupled with the extra labour required to make cable transitions, will increase installation and material costs. With regard to training, while it is important that the change be communicated to all the relevant stakeholder groups, this can be done in the course of routine training on changes to the Code. No dedicated training is necessary. 10 IMPACT ON BUSINESS: LARGE AND SMALL (IF APPLICABLE) Compliance costs: Compliance will increase project costs, but there are several installation methods that can be used to implement this change, allowing costs to be optimized. Ultimately, the costs are transferred to the property owner. Change of investment: Not applicable. Job creation/job loss: Not applicable. Labour mobility: Not applicable. Impact on import/export of goods: Not applicable. Certification and licensing: Not applicable. Insurance: Not applicable. 11 WHAT IS THE PRACTICE/EXPERIENCE IN OTHER JURISDICTIONS? 11.1 Are standards consistent with (or lesser/greater than) other jurisdictions? Currently, there are no deviations from this requirement of the national Code in provincial electrical codes. Input from other jurisdictions is pending (23) Conflict with other Ministries or Codes No conflict has been observed Consequences for other Departments/Ministries, e.g., apprentice training Not applicable Consequences for other Codes from other jurisdictions (US, European standards) Not applicable. Page 9 17/12/2014

11 12 CONSULTATION PROCESS Canadian Electrical Code, Part I Full Impact Assessment Representatives from the following groups of stakeholders were involved in the consensus approval of this change as part of CSA Group s standards development process: Note: For details about the standards development process as it applies to the CE Code, Part I, please refer to Appendix C of the Code. Regulatory authorities from various provincial, territorial, and municipal electrical inspection authorities Owners/Operators/Producers from groups with national stature, representing the viewpoints of electrical equipment manufacturers, electrical installation designers and installers, and electrical installation users General interest groups with national stature, representing the viewpoints of (a) fire chiefs; (b) electric utilities; (c) committees responsible for related electrical codes and standards; (d) fire insurers; (e) labour; (f) issuers of building codes; and (g) educators. A regulatory/legislative body may want to hold additional consultations with all or some of these groups within its jurisdiction to clarify issues specific to the jurisdiction. 13 PROPOSED EFFECTIVE DATE OF CHANGES The change will be included in the 2015 edition of the CE Code, Part I, to be published in January Page 10 17/12/2014

12 APPENDIX 1 CODE RANKING TOOL VALUES Reason for Change Safety consideration (Severity) Subject # Safety consideration (Frequency) 10 For clarity 8 Crucial to harmonize Purely administrative 8 0 Community's desire to change - Environment, Health, Safety 7 Technological change/new Rule 8 Total Score for Reason for Change Extent of Use & Value Add Prevalence of rule use if accepted Number of stakeholders affected on frequent basis 9 Largest type of stakeholder who would benefit 10 Benefit to society Total Score for Extent of Use Risk for Changing Rule/Staying Status The jurisdiction or stakeholder's ability to compete based on incompatibility with other standards Complexity of implementation 5 Total costs to implement, e.g. cost to install, to educate, to manufacture,or inspect, increased product cost, increased cost of electricity. 3 Conflict with other Ministries or Code 0 Largest type of stakeholder who would be negatively affected 9 Total Score for Risk of Changing Rule/ Staying Status Quo 18 Total 107 Page 11 17/12/2014