National Fire Protection Association 1 Batterymarch Park, Quincy, MA 02169-7471 Phone: 617-770-3000 Fax: 617-770-0700 www.nfpa.org MEMORANDUM To: NEC Code-Making Panel 10 From: Kimberly Shea, Project Administrator Date: April 16, 2015 Subject: NEC First Draft TC FINAL Ballot Results (A2016) According to the final ballot results, all ballot items received the necessary affirmative votes to pass ballot. 12 Members Eligible to Vote 0 Members Ballots Not Returned 3 Members voted Affirmative with Comment on one or more Revision (Fredericks, Hidaka, Vance) 1 Members voted Negative on one or more Revision (Fredericks) 0 Members Abstained on one or more Revision The attached report shows the number of affirmative, negative, and abstaining votes as well as the explanation of the vote for each first revision. There are two criteria necessary for each first revision to pass ballot: (1) simple majority and (2) affirmative 2 / 3 vote. The mock examples below show how the calculations are determined. (1) Example for Simple Majority: Assuming there are 20 vote eligible committee members, 11 affirmative votes are required to pass ballot. (Sample calculation: 20 members eligible to vote 2 = 10 + 1 = 11) (2) Example for Affirmative 2 / 3 : Assuming there are 20 vote eligible committee members and 1 member did not return their ballot and 2 members abstained, the number of affirmative votes required would be 12. (Sample calculation: 20 members eligble to vote 1 not returned 2 abstentions = 17 x 0.66 = 11.22 = 12 ) As always please feel free to contact me if you have any questions.
First Revision No. 2701-NFPA 70-2015 [ Definition: Coordination (Selective). ] Coordination, Selective (Selective Coordination ). Localization of an overcurrent condition to restrict outages to the circuit or equipment affected, accomplished by the selection and installation of overcurrent protective devices and their ratings or settings for the full range of available overcurrents, from overload to the maximum available fault current, and for the full range of overcurrent protective device opening times associated with those overcurrents. Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 08:40:35 EST 2015 Committee Statement Committee Statement: Response Message: This first revision is an editorial correction for the purposes of clarity, usability and correlation with other definition titles that include a descriptor. Public Input No. 1492-NFPA 70-2014 [Definition: Coordination (Selective).] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 11 Affirmative All 1 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Fredericks, Carl Page 1
Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Hidaka, Jeffrey H. none Page 2
First Revision No. 2702-NFPA 70-2015 [ Definition: Tap Conductors. ] Tap Conductors Conductor. As used in this article, a tap conductor is defined as a conductor A conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds the value permitted for similar conductors that are protected as described elsewhere in 240.4. Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 09:32:54 EST 2015 Committee Statement Committee Statement: Response Message: This first revision is editorial in nature in compliance with the NEC style manual. Public Input No. 4025-NFPA 70-2014 [Definition: Tap Conductors.] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 11 Affirmative All 1 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Fredericks, Carl Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Page 3
Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Hidaka, Jeffrey H. none Page 4
First Revision No. 2703-NFPA 70-2015 [ Section No. 240.6(A) ] (A) Fuses and Fixed-Trip Circuit Breakers. The standard ampere ratings for fuses and inverse time circuit breakers shall be considered 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000, and 6000 amperes as shown in Table 240.6(A). Additional standard ampere ratings for fuses shall be 1, 3, 6, 10, and 601. The use of fuses and inverse time circuit breakers with nonstandard ampere ratings shall be permitted. Table 240.6(A) Standard Ampere Ratings for Fuses and Inverse Time Circuit Breakers Standard Ampere Ratings 15 20 25 30 35 40 45 50 60 70 80 90 100 110 125 150 175 200 225 250 300 350 400 450 500 600 700 800 1000 1200 1600 2000 2500 3000 4000 5000 6000 Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 10:00:33 EST 2015 Committee Statement Committee Statement: Response Message: This first revision editorially revises the standard ampere ratings for fuses and inverse time circuit breakers into a table format for clarity and usability. Public Input No. 1056-NFPA 70-2014 [Section No. 240.6(A)] Public Input No. 1441-NFPA 70-2014 [Section No. 240.6(A)] Ballot Results This item has passed ballot Page 5
12 Eligible Voters 0 Not Returned 11 Affirmative All 1 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Fredericks, Carl Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Hidaka, Jeffrey H. none Page 6
First Revision No. 2704-NFPA 70-2015 [ Section No. 240.21(C)(4) ] (4) Outside Secondary Conductors. Where the conductors are located outdoors outside of a building or structure, except at the point of load termination, and comply with all of the following conditions: (1) The conductors are protected from physical damage in an approved manner. (2) The conductors terminate at a single circuit breaker or a single set of fuses that limit the load to the ampacity of the conductors. This single overcurrent device shall be permitted to supply any number of additional overcurrent devices on its load side. (3) The overcurrent device for the conductors is an integral part of a disconnecting means or shall be located immediately adjacent thereto. (4) The disconnecting means for the conductors is installed at a readily accessible location complying with one of the following: a. Outside of a building or structure b. Inside, nearest the point of entrance of the conductors c. Where installed in accordance with 230.6, nearest the point of entrance of the conductors Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 11:38:44 EST 2015 Committee Statement Committee Statement: The title of the section is "Outside Secondary Conductors". The body of the text should align. Revision is presented in the attached word file. Response Message: Public Input No. 432-NFPA 70-2014 [Section No. 240.21(C)(4)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned Page 7
11 Affirmative All 1 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Fredericks, Carl Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Hidaka, Jeffrey H. none Page 8
First Revision No. 2705-NFPA 70-2015 [ Section No. 240.24(A) ] (A) Accessibility. Overcurrent Switches containing fuses, and circuit breakers devices shall be readily accessible and shall be installed so that the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than 2.0 m (6 ft 7 in.) above the floor or working platform, unless one of the following applies: (1) For busways, as provided in 368.17(C). (2) For supplementary overcurrent protection, as described in 240.10. (3) For overcurrent devices, as described in 225.40 and 230.92. (4) For overcurrent devices adjacent to utilization equipment that they supply, access shall be permitted to be by portable means. Exception: The use of a tool shall be permitted to access overcurrent devices located within listed industrial control panels or similar enclosures. Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 13:57:32 EST 2015 Committee Statement Committee Statement: The first sentence has been revised and an exception added to clarify the requirement. This is necessary because of the change to the definition of Accessible, Readily in the 2014 NEC. This clarifies that a screwdriver (a tool) is permissible to be used to open the enclosure in order to gain access to the overcurrent device. For PI 4105, the proposed requirement for an externally operating disconnect means would be more appropriately located in Article 409. The Correlating Committee is requested to appoint a Task Group to review the definition and global usage of Accessible, Readily. Response Message: Public Input No. 2848-NFPA 70-2014 [Section No. 240.24(A)] Public Input No. 4105-NFPA 70-2014 [Section No. 240.24(A)] Ballot Results Page 9
0 This item has passed ballot 12 Eligible Voters 0 Not Returned 10 Affirmative All 2 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Fredericks, Carl I m voting affirmative on the panel action, but would suggest that in the next available revision we remove the word listed from this new exception text. Non-listed control panels that are compliant with NEC Article 409 will have the same issues that this exception addresses, and it would seem more logical for the code to have the exception text in one location. The Task Group as suggested by the panel statement to review the definition and global usage of Accessible, Readily may be the best way to completely address this issue. Hidaka, Jeffrey H. The comma after fuses and the word "devices" should be deleted. Page 10
1 First Revision No. 2707-NFPA 70-2015 [ New Section after 240.61 ] 240.67 Arc Energy Reduction. Where the ampere rating of the fusible switch is 1200 A or higher, 240.67(A) and (B) shall apply. This requirement shall become effective January 1, 2020. (A) Documentation. Documentation shall be available to those authorized to design, install, operate, or inspect the installation as to the location of the fusible switch(es). (B) Method to Reduce Clearing Time. One of the following shall be provided: (1) Differential relaying (2) Energy-reducing maintenance switching with local status indicator (3) Energy-reducing active arc flash mitigation system (4) A fuse that would open the circuit in 0.07 seconds or less, at or below the available arcing current (5) An approved equivalent means Informational Note No. 1: An energy-reducing maintenance switch allows a worker to set a disconnect switch to reduce the clearing time while the worker is working within an arc-flash boundary as defined in NFPA 70E -2015, Standard for Electrical Safety in the Workplace, and then to set the disconnect switch back to a normal setting after the potentially hazardous work is complete. Informational Note No. 2: An energy-reducing active arc flash mitigation system helps in reducing arcing duration in the electrical distribution system. No change in the disconnect switch or the settings of other devices is required during maintenance when a worker is working within an arc flash boundary as defined in NFPA 70E -2015, Standard for Electrical Safety in the Workplace. Informational Note No. 3: IEEE 1584, IEEE Guide for performing Arc Flash Hazard Calculations, is one of the available methods that provide guidance in determining arcing current. Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 17:30:04 EST 2015 Committee Statement Committee Statement: The benefits of an arc energy reduction requirement that reduces incident energy for circuit breakers rated 1200 ampere and greater have been well established. Those same Page 11
2 methods of incident energy reduction could also be utilized with 1200 ampere and greater fusible switches. This public input is based upon the requirements in 240.87, but modified to work with fusible switches. Arc energy reduction requirements for fuses and circuit breakers must be located in the appropriate part of Article 240. The present arc energy reduction requirement is properly located in Part VII Circuit Breakers. An arc energy reduction requirement for fuse applications is properly located in Part VI Cartridge Fuses and Fuseholders. The numbering sequence of 240.67 is chosen to coincide with 240.87. Basing this proposed new requirement on the existing text in 240.87 retains the parent text modified for fusible switches. First level subdivision (A) is retained for necessary documentation. First level subdivision (B) similarly addresses methods to reduce clearing time as follows: (1) Differential relaying. (2) Energy-reducing maintenance switching with local status indicator. (3) Energy-reducing active arc flash mitigation system. (4) An available arcing current that would open the circuit in 0.07 seconds or less. Circuit breakers utilizing ZSI to meet the requirements of 240.87 can take up to 0.07 seconds to open the circuit. Therefore, a maximum fuse opening time of 0.07 seconds was also chosen in list item (4) to provide equivalent protection to that provided by circuit breakers. (5) An approved equivalent means The existing informational notes in 240.87 are retained for clarity. The delay in the effective date for this requirement is needed to ensure the electrical industry can respond with feasible solutions, available from multiple manufacturers, to meet this requirement. Informational Note No. 3 on IEEE 1584 has been added to describe at least one of the available methods to calculate incident energy. Response Message: Public Input No. 3293-NFPA 70-2014 [New Section after 240.61] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 9 Affirmative All 2 Affirmative with Comments 1 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Page 12
3 Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Kauer, Robert J. Mount, Jr., Robert W. Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Affirmative with Comment Hidaka, Jeffrey H. none Vance, Christopher R. The Informational Note 3 should be excluded as it is already covered by the work practice document NFPA 70E referenced in IN 2 Negative with Comment Fredericks, Carl I m voting against the panel action to create this new Section 240.67, because it lacks two key elements that were also proposed and rejected for 240.87: First as proposed in PI 1704 for 240.87, methods to reduce clearing time should not be required by the NEC for installations where the calculated incident energy at the working distance is 8 cal/cm2 or less. Required PPE for this energy level is consistent with the reduced PPE level that will be required after approved methods to reduce clearing time are applied to some installations, and consistent with what is needed for some installations that do not fall under 240.87 or would not fall under 240.67. It is common in many workplaces to provide 8 cal/cm2 clothing as daily wear. Second as proposed in PI 1764 for 240.87, there should be an exception to these requirements where the fusible switch serves continuous industrial processes where a lack of protective device coordination will introduce greater or other hazards. All of the measures that could be cost-effectively provided for loads served by an outgoing fusible switch would introduce some level of protective device miscoordination. Qualified industrial users should be allowed to appropriately manage the full spectrum of hazards, which they could do via the proposed exception. ACC could support the proposed new section if the above two changes were made. Page 13
14 First Revision No. 2706-NFPA 70-2015 [ Section No. 240.87(B) ] (B) Method to Reduce Clearing Time. One of the following or approved equivalent means shall be provided: (1) Zone-selective interlocking (2) Differential relaying (3) Energy-reducing maintenance switching with local status indicator (4) Energy-reducing active arc flash mitigation system (5) An approved equivalent means An instantaneous trip setting that is less than the available arcing current (6) An instantaneous override that is less than the available arcing current (7) An approved equivalent means Informational Note No. 1: An energy-reducing maintenance switch allows a worker to set a circuit breaker trip unit to no intentional delay to reduce the clearing time while the worker is working within an arc-flash boundary as defined in NFPA 70E-2012 2015, Standard for Electrical Safety in the Workplace, and then to set the trip unit back to a normal setting after the potentially hazardous work is complete. Informational Note No. 2: An energy-reducing active arc flash mitigation system helps in reducing arcing duration in the electrical distribution system. No change in the circuit breaker or the settings of other devices is required during maintenance when a worker is working within an arc flash boundary as defined in NFPA 70E-2012 2015, Standard for Electrical Safety in the Workplace. Informational Note No. 3: An instantaneous trip is a function that causes a circuit breaker to trip with no intentional delay when currents exceed the instantaneous trip setting or current level. If arcing currents are above the instantaneous trip level, the circuit breaker will trip in the minimum possible time. Informational Note No. 4: IEEE 1584 2002, IEEE Guide for Performing Arc Flash Hazard Calculations, is one of the available methods that provide guidance in determining arcing current. Submitter Information Verification Submitter Full Name: CMP 10 Organization: [ Not Specified ] Street Address: City: State: Zip: Submittal Date: Mon Jan 12 15:06:04 EST 2015 Committee Statement Committee Statement: The phrase or an approved equivalent means is removed from the parent text of 240.87(B) editorially as it exists in present list item (5). Page 14
5 This proposed revision creates new list items (5) and (6) for clarity and usability. These new list items will now clearly describe specific permitted methods of achieving the arc energy reduction required in this section. It is critical that the available arcing current exceeds the instantaneous trip or instantaneous override in order for the circuit breaker to open as quickly as possible during an arcing fault, and that is the whole purpose of Section 240.87(B), to open as quickly as possible during an arcing fault. It is not enough to just require an instantaneous trip or an instantaneous override, because the arcing current could be low enough that it takes the circuit breaker many cycles to many seconds to open. If the arcing current is greater than the instantaneous trip or instantaneous override, most circuit breakers will clear somewhere between ½ cycle (smaller molded case type) and 3 cycles (power or air-frame type), providing the increased protection that 240.87 intends. This addresses the concerns that Mr. Kauer raised in the balloting stage on comment 10-24 in the 2014 NEC revision cycle. Existing list item (5) is editorially relocated as list item (7) and continues to permit other approved methods which may include new technologies. Informational Note No. 3 on Instantaneous Trip from PI 1640 has been added to explain the relationship between an instantaneous trip and incident energy. Informational Note No. 4 on IEEE 1584 has been added to describe at least one of the available methods to calculate incident energy. Response Message: Public Input No. 567-NFPA 70-2014 [Section No. 240.87(B)] Public Input No. 1384-NFPA 70-2014 [Section No. 240.87(B)] Public Input No. 1385-NFPA 70-2014 [Section No. 240.87(B)] Public Input No. 1443-NFPA 70-2014 [Section No. 240.87(B)] Public Input No. 1640-NFPA 70-2014 [Section No. 240.87(B)] Public Input No. 2243-NFPA 70-2014 [Section No. 240.87(B)] Ballot Results This item has passed ballot 12 Eligible Voters 0 Not Returned 11 Affirmative All 1 Affirmative with Comments 0 Negative with Comments 0 Abstention Affirmative All Blizard, Scott A. Burns, Julian R. Darling, Dennis M. Dollard, Jr., James T. Fredericks, Carl Kauer, Robert J. Mount, Jr., Robert W. Page 15
6 Rempe, Kenneth J. Saporita, Vincent J. Sobel, Richard Vance, Christopher R. Affirmative with Comment Hidaka, Jeffrey H. none Page 16