1、 6 February 2012 STDPT97085 Accredited Standards Committee C2-2012 Errata to 2012 Edition National Electrical Safety CodeCorrection Sheet Issued 6 February 2012 Copyright 2012 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 2012 Printed in the United Sta
2、tes of America. This correction sheet may be freely reproduced and distributed in order to maintain the utility and currency of the underlying Standard. This correction sheet may not be sold, licensed or otherwise distributed for any commercial purposes whatsoever. The content of this correction she
3、et may not be modified. 6 February 2012 STDPT97085 Page 2: There is a typographical error in Rule 011A4. The sentence should contain a closing parenthesis. 4. Street and area lights that provide a supply of lumens where these facilities are supplied by underground or overhead conductors installed an
4、d/or maintained under the exclusive control of utilities (including their authorized contractors or other qualified persons). Page 96: There is an error in item (f) of Footnote 10 that appears at the end of Table 232-1 (m). Item (f) should contain “215C4 or.” (f) Grounded guys, guys meeting Rules 27
5、9A1 and 215C4 or 215C5 exposed to 0 to 300 V 2.9 Page 96: There is an error in Footnote 15 that appears at the end of Table 232-1 (m). The word “215C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as
6、grounded guys. Page 97: There are errors that appear at the end of Table 232-1 (m). Although Footnote 25 was deleted from the previous version, it should have been listed as follows. Therefore, the inserted footnote should have been shown as Footnote 26. This footnote not used in this edition. When
7、designing a line to accommodate oversized vehicles, these clearance values shall be increased by the difference between the known height of the oversized vehicle and 4.3 m. Pages 97, 98, and 99: There is an error in Table 232-1 (ft). The cells in columns 2 and 5 of the header row should state “(ft)”
8、 for feet and not “(m)” for meters. Nature of surface underneath wires, conductors, or cables Insulatedcommunication conductors and cable; messengers; overhead shield/ surge-protection wires; grounded guys; ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to 0 to 300 V; neut
9、ral conductors meeting Rule 230E1; supply cables meeting Rule 230C1 (ft) Noninsulated communication conductors; supply cables of 0 to 750 V meeting Rule 230C2 or 230C3 (ft) Supply cables over 750 V meeting Rule 230C2 or 230C3; open supply conductors, 0 to 750 V; ungrounded portions of guys meeting R
10、ules 215C4, 215C5, and 279A1 exposed to over 300 V to 750 V(ft) Open supply conductors, over 750 V to 22 kV; unground -ed portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to 750 V to 22 kV(ft) Trolley and electrified railroad contact conductors and associated span or messenger wires0 t
11、o 750 V to ground (ft) Over 750 V to 22 kV to ground (ft) Page 100: There is an error in item (f) of Footnote 10 that appears at the end of Table 232-1 (ft). Item (f) should contain “215C4 or.” (f) Grounded guys, guys meeting Rules 279A1 and 215C4 or 215C5 exposed to 0 to 300 V 9.5 6 February 2012 S
12、TDPT97085 Page 100: There is an error in Footnote 15 that appears at the end of Table 232-1 (ft). The word “215C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as grounded guys. Although Footnote 25 w
13、as deleted from the previous version, it should have been listed as follows. Therefore, the inserted footnote should have been shown as Footnote 26. This footnote not used in this edition. When designing a line to accommodate oversized vehicles, these clearance values shall be increased by the diffe
14、rence between the known height of the oversized vehicle and 14 ft. Page 129: There are three errors in Figure 234-4(b). At the top of the figure, the two instances of “H” should read “A.” The text associated with “A” in the legend should read “B + 5.5 m (18 ft)” and not “V + 5.5 m (18 ft).” Figure 2
15、34-4(b)Clearance envelope for grain bins filled by portable augers, conveyors, or elevators 6 February 2012 STDPT97085 Pages 130, 131, and 132: There is an error in Table 234-1 (m). The cell in column 6 of the header row should contain “ungrounded equipment cases, 750 V to 22 kV.” Clearance of Insul
16、ated communication conductors and cables; messengers; overhead shield/ surge-protection wires; grounded guys; ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to 0 to 300 Vneutral conductors meeting Rule 230E1; supply cables meeting Rule 230C1 (m) Supply cables of 0 to 750 V
17、 meeting Rule 230C2 or 230C3 (m) Unguarded rigid live parts, 0 to 750 V; noninsulated communication conductors; ungrounded equipment cases, 0 to 750 V; and ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to open supply conductors of over 300 V to 750 V(m) Supply cables over
18、 750 V meeting Rule 230C2 or 230C3; open supply conductors, 0 to 750 V(m) Unguarded rigid live parts, over 750 V to 22 kV; ungrounded equipment cases, 750 V to 22 kV; ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to over 750 V to 22 kV(m) Open supply conductors, over 750
19、V to 22 kV (m) Page 133: There is an error in Footnote 11 that appears at the end of Table 234-1 (m). The word “215C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as grounded guys. Although Footnotes
20、 12 and 13 were deleted from the previous version, the remaining footnotes should not have been renumbered. They should be listed as follows: This footnote not used in this edition. This footnote not used in this edition. For clearances above railings, walls, or parapets around balconies, decks, or
21、roofs, use the clearances required for row 1b(1). For such clearances where an outside stairway exists to provide access to such balconies, decks, or roofs, use the clearances required for row 2b(2). Does not include neutral conductors meeting Rule 230E1. These clearance values also apply to guy ins
22、ulators. It is presumed that a flag or banner is fully extended but that there is no deflection or displacement of the flagpole or other supporting structure due to wind and that the conductors, cables, or rigid live parts are not displaced by the wind. The specified clearance is measured to the poi
23、nt of maximum displacement of the banner or flag towards the overhead utility facility. When designing a line to accommodate oversized vehicles, these clearance values shall be increased by the difference between the known height of the oversized vehicle and 4.3 m. 6 February 2012 STDPT97085 Pages 1
24、34, 135, and 136: There is an error in Table 234-1 (ft). The cell in column 6 of the header row should contain “ungrounded equipment cases, 750 V to 22 kV.” Clearance of Insulated communication conductors and cables; messengers; overhead shield/ surge- protection wires; grounded guys; ungrounded por
25、tions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to 0 to 300 Vneutral conductors meeting Rule 230E1; supply cables meeting Rule 230C1 (ft) Supply cables of 0 to 750 V meeting Rule 230C2 or 230C3 (ft) Unguarded rigid live parts, 0 to 750 V; noninsulated communication conductors; ungrounded
26、 equipment cases, 0 to 750 V; and ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to open supply conductors of over 300 V to 750 V(ft) Supply cables over 750 V meeting Rule 230C2 or 230C3; open supply conduc- tors, 0 to 750 V(ft) Unguarded rigid live parts, over 750 V to 22
27、 kV; ungrounded equipment cases, 750 V to 22 kV; ungrounded portions of guys meeting Rules 215C4, 215C5, and 279A1 exposed to over 750 V to 22 kV(ft) Open supply conduc- tors, over 750 V to 22 kV (ft) Page 137: There is an error in Footnote 11 that appears at the end of Table 234-1 (ft). The word “2
28、15C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as grounded guys. Although Footnotes 12 and 13 were deleted from the previous version, the remaining footnotes should not have been renumbered. They
29、should be listed as follows: This footnote not used in this edition. This footnote not used in this edition. For clearances above railings, walls, or parapets around balconies, decks, or roofs, use the clearances required for row 1b(1). For such clearances where an outside stairway exists to provide
30、 access to such balconies, decks, or roofs, use the clearances required for row 2b(2). Does not include neutral conductors meeting Rule 230E1. These clearance values also apply to guy insulators. It is presumed that a flag or banner is fully extended but that there is no deflection or displacement o
31、f the flagpole or other supporting structure due to wind and that the conductors, cables, or rigid live parts are not displaced by the wind. The specified clearance is measured to the point of maximum displacement of the banner or flag towards the overhead utility facility. When designing a line to
32、accommodate oversized vehicles, these clearance values shall be increased by the difference between the known height of the oversized vehicle and 14 ft. 6 February 2012 STDPT97085 Page 138: There is a typographical error in Table 234-2 (m). The underscore should be removed from the comma in the last
33、 sentence of the parenthetical statement below the table caption. Table 234-2 Clearance of wires, conductors, cables, and unguarded rigid live parts from bridges (Voltages are phase to ground for effectively grounded circuits and those other circuits where all ground faults are cleared by promptly d
34、e-energizing the faulted section, both initially and following subsequent breaker operations. See the definitions section for voltages of other systems. Clearances are with no wind displace- ment except where stated in the footnotes below. See Rules 234A, 234D1a, and 234H4.) Page 142: There is an er
35、ror in Footnote 2 that appears at the end of Table 234-3 (m). The word “215C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as grounded guys. Page 143: There is an error in Footnote 2 that appears at
36、the end of Table 234-3 (ft). The word “215C5” should be replaced with “215C4.” The portion of anchor guys below the lowest insulator meeting Rules 279A1 and 215C4 may have the same clearance as grounded guys. Page 166: There is an error in Table 235-6 (mm). The cell in column 2 of row 2c should read
37、 “75” and not “3.” c. All other 75150 150 150 150 plus 10 per kV in excess of 8.7 kV 580 plus 10 per kV in excess of 50 kV Page 222: There is a typographical error in Footnote 3 that appears at the end of Table 261-1. Delete the strikethrough (“R”) in the last sentence of the footnote. Wood and rein
38、forced structures shall be replaced or rehabilitated when deterioration reduces the structure strength to 3/4 of that required when installed. When new or changed facilities modify loads on existing structures, the re-quired strength shall be based on the revised loadings. If a structure or componen
39、t is replaced, it shall meet the strength required by Table 261-1. If a structure or component is rehabilitated, the rehabilitated portions of the structures shall have strength greater than 3/4 of that required when installed. Page 230: There is an error in Rule 279A2b(1). The sentence should conta
40、in “215C4 or.” (1) The guy is otherwise insulated to meet the requirements of Rules 215C4 or 215C5 and 279A1. Page 262: There is a typographical error in Rule 410A3b. The exception and notes are applicable to Rule 410A3 and not Rule 410A3b. 6 February 2012 STDPT97085 410. General requirements A. Gen
41、eral 3. The employer shall ensure that an assessment is performed to determine potential exposure to an electric arc for employees who work on or near energized lines, parts, or equipment. If the assessment determines potential employee exposure, clothing made from acetate, nylon, polyester, or poly
42、propylene shall not be worn, unless arc rated. If the assessment determines a potential employee exposure greater than 2 cal/cm2 exists (see Neal, Bingham, and Doughty B63), the employer shall: a. Perform a detailed arc hazard analysis, or use Table 410-1, 410-2, or 410-3 to determine the effective
43、arc rating of clothing or a clothing system to be worn by employees working on or near energized lines, parts, or equipment at voltages 50 V to 800 000 V. The arc hazard analysis shall include a calculation of the estimated arc energy based on the available fault current, the duration of the arc (cy
44、cles), and the distance from the arc to the employee. b. Require employees to wear clothing or a clothing system with an effective arc rating not less than the anticipated level of arc energy. EXCEPTION: If the clothing or clothing system required by this rule has the potential to create additional
45、or greater hazards than the possible exposure to the heat energy of the electric arc, then clothing or a clothing system with an effective arc rating less than that required by the this rule may be worn. NOTE 1: Assessments performed to determine potential exposure to an electric arc consider the af
46、fected employees assigned tasks and/or work activities. NOTE 2: A clothing system (multiple layers) that includes an outer layer of flame resistant material and an inner layer of non-flame resistant natural fiber material has been shown to block more heat than a single layer. The effect of the combination of these multiple layers may be referred to as the effective arc rating (e.g., EBT, ATPV). NOTE 3: Engineering controls can be utilized to reduce arc energy levels and work practices can be utilized to reduce exposure levels.
