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2023 National Electrical Safety Code (NESC)

2023 National Electrical Safety Code® (NESC®)

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2023 NESC Handbook

2023 NESC Handbook

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National Electrical Safety Code Tabs

NESC Tabs

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2023 eLearning Courses

This set of courses is based on the changes to the 2023 NESC and covers:

  • Changes to the NESC 2023 edition
  • Introduction to grounding
  • Rules for installation and maintenance of electric supply stations
  • Rules for installation and maintenance of overhead electric supply
  • Safety rules for the installation and maintenance of underground electric supply
  • Work rules for the operation of electric supply and communication lines and equipment

Available in the IEEE Learning Network

NESC eLearning Courses

2023 NESC ELearning Course Banner

Supporting Documents

NESC Errata Sheets

NESC errata sheets are available for download at no charge. Errata sheets are separate pages issued after an edition of the NESC has been approved and published. The errata sheet corrects typographical or editorial errors that have been found on a particular page or section corresponding to a specific NESC edition.

Interpretations

The NESC Committee maintains an Interpretations Subcommittee to provide consensus responses regarding the intended application of the NESC. NESC Interpretations serve as the official explanation of the intention of code requirements until such time as the rules are modified. NESC subcommittees review all recent Interpretations as part of each code revision cycle to see if modifications of code language are needed.

NESC Interpretations are available for download at no charge. Interpretation requests may be submitted to the NESC Interpretations Subcommittee when the wording of a specific rule or set of rules is ambiguous or incomplete, using the NESC Interpretation Request Form (DOC).

The Interpretations Subcommittee is limited to providing an interpretation of the text of the Code in order to clarify the application or exact nature of a requirement of the Code. IEEE cannot process a request for consulting advice, including general application of the Code, design information, and/or design approval.

View Interpretations

NESC IR 592 (PDF)
Rule 410A3B, 28 April 2021
National Electrical Safety Code® Interpretations
NESC IR 591 (PDF)
Rule 011A1, 10 March 2021
National Electrical Safety Code® Interpretations
NESC IR 590 (PDF)
Rule 261A, 14 April 2020
National Electrical Safety Code® Interpretations
NESC IR 589 (PDF)
Rule 235C2b(1)(c), 8 April 2020
National Electrical Safety Code® Interpretations
NESC IR 588 (PDF)
Rule 224A3a, 26 May 2019
National Electrical Safety Code® Interpretations
NESC IR 587 (PDF)
Rule 250D, 10 May 2019
National Electrical Safety Code® Interpretations
NESC IR 586 (PDF)
Rule 092C3, 27 March 2019
National Electrical Safety Code® Interpretations
NESC IR 585 (PDF)
Rule 233B, 233C, 2 October 2018
National Electrical Safety Code® Interpretations
NESC IR 584 (PDF)
Rule 235C2a, 8 June 2018
National Electrical Safety Code® Interpretations
NESC IR 583 (PDF)
Rule 323B, 11 September 2017
National Electrical Safety Code® Interpretations
NESC IR 582 (PDF)
Rule 124, 4 May 2017
National Electrical Safety Code® Interpretations
NESC IR 581 (PDF)
Rule 96D and Rule 99A, 6 Dec 2016
National Electrical Safety Code® Interpretations
NESC IR 579 (PDF)
Rule 110A, 24 May 2016
National Electrical Safety Code® Interpretations
NESC IR 578 (PDF)
Rule 097B2, 29 June 2015
National Electrical Safety Code® Interpretations
NESC IR 577a (PDF)
Rule 232.A, 9 December 2014
National Electrical Safety Code® Interpretations
NESC IR 577 (PDF)
Rule 232.A, 9 December 2014
National Electrical Safety Code® Interpretations
NESC IR 576 (PDF)
Rule 235C1b, 9 September 2014
National Electrical Safety Code® Interpretations
NESC IR 575 (PDF)
Rules 224A, 238D, 5 September 2014
National Electrical Safety Code® Interpretations
NESC IR 574 (PDF)
Rule 184A4, 3 October 2013
National Electrical Safety Code® Interpretations
NESC IR 573 (PDF)
Rule 354D, 9 December 2013
National Electrical Safety Code® Interpretations
NESC IR 572 (PDF)
Rules 011 and 012, 28 May 2013
National Electrical Safety Code® Interpretations
NESC IR 571 (PDF)
Rule 235C2b., 17 December 2012
National Electrical Safety Code® Interpretations
NESC IR 570 (PDF)
Rule 094B., 17 December 2012
National Electrical Safety Code® Interpretations
NESC IR 569 (PDF)
Rule 215C4b., 2 October 2012
National Electrical Safety Code® Interpretations
NESC IR 568 (PDF)
Rule 410.A.3.b., 3 May 2012
National Electrical Safety Code® Interpretations
NESC IR 567 (PDF)
Rule 250C & 261A1c, 13 March 2012
National Electrical Safety Code® Interpretations
NESC IR 566 (PDF)
Rule 235C2b(1)(c)i, 26 March 2012
National Electrical Safety Code® Interpretations
NESC IR 565 (PDF)
Section 2: Definitions – Sag, 10 April 2012
National Electrical Safety Code® Interpretations
NESC IR 564 (PDF)
Rule 215C1, 15 November 2011
National Electrical Safety Code® Interpretations
NESC IR 563 (PDF)
Rule 236G, 15 November 2011
National Electrical Safety Code® Interpretations
NESC IR 561 (PDF)
Rule 261A2a, 11 May 2010
National Electrical Safety Code® Interpretations
NESC IR 560 (PDF)
Rule 235C1a, 235E1, 15 Nov 2011
National Electrical Safety Code® Interpretations
NESC IR 559 (PDF)
Rule 096C, 6 October 2009
National Electrical Safety Code® Interpretations
NESC IR 558 (PDF)
Rule 410A3, 14 January 2009
National Electrical Safety Code® Interpretations
NESC IR 557 (PDF)
Rule 410A3, 14 January 2009
National Electrical Safety Code® Interpretations
NESC IR 556 (PDF)
Rule 261C, 29 October 2008
National Electrical Safety Code® Interpretations
NESC IR 555 (PDF)
Rule 341B1c, 29 October 2008
National Electrical Safety Code® Interpretations
NESC IR 554 (PDF)
Rule 444D, 29 October 2008
National Electrical Safety Code® Interpretations
NESC IR 553 (PDF)
Rule 384C, 29 October 2008
National Electrical Safety Code® Interpretations
NESC IR 552 (PDF)
Rule 215C1, 11 July 2008
National Electrical Safety Code® Interpretations
NESC IR 551 (PDF)
Rule 215C5b, 20 January 2009
National Electrical Safety Code® Interpretations
NESC IR 550 (PDF)
Rule 215C1, 20 March 2008
National Electrical Safety Code® Interpretations
NESC IR 549 (PDF)
Rule 260B, 261A1b; Table 261-1A, 19 Mar 2008
National Electrical Safety Code® Interpretations
NESC IR 548 (PDF)
Rule 013B3, 26 March 2009
National Electrical Safety Code® Interpretations
NESC IR 547 (PDF)
Rule 092B1, 14 January 2008
National Electrical Safety Code® Interpretations
NESC IR 546 (PDF)
Rule 110B2, 30 March 2007
National Electrical Safety Code® Interpretations
NESC IR 545 (PDF)
Rule 232 & Table 232-1, 31 Jan 2007
National Electrical Safety Code® Interpretations
NESC IR 544 (PDF)
Rule 410A3, 24 January 2007
National Electrical Safety Code® Interpretations
NESC IR 543 (PDF)
Rule 234 & Table 234-1, 5 July 2006
National Electrical Safety Code® Interpretations
NESC IR 542 (PDF)
Rule 111A & Table 111-1, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 541 (PDF)
Rule 234C3d, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 540 (PDF)
Rule 441 & Table 441-1, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 539 (PDF)
Rule 092E, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 538 (PDF)
Rule 252A and 251A3, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 537 (PDF)
Rule 234 & Table 234-1, 16 Dec 2005
National Electrical Safety Code® Interpretations
NESC IR 536 (PDF)
Rule 017B & 094B2, 23 May 2005
National Electrical Safety Code® Interpretations
NESC IR 535 (PDF)
Rule 233 Table 233-1, 23 May 2005
National Electrical Safety Code® Interpretations
NESC IR 534 (PDF)
Rule 381G2, 23 May 2005
National Electrical Safety Code® Interpretations
NESC IR 533 (PDF)
Rule 230C1, 6 February 2004
National Electrical Safety Code® Interpretations
NESC IR 532 (PDF)
Rule 096C, 25 August 2003
National Electrical Safety Code® Interpretations
NESC IR 531 (PDF)
Rule 279A2a, 25 August 2003
National Electrical Safety Code® Interpretations
NESC IR 530 (PDF)
Rule 261D2a(2), 3 September 2002
National Electrical Safety Code® Interpretations
NESC IR 529 (PDF)
Rule 230I, 24 July 2002
National Electrical Safety Code® Interpretations
NESC IR 528 (PDF)
Rule 092E, 12 March 2002
National Electrical Safety Code® Interpretations
NESC IR 527 (PDF)
Rule 234C, 28 May 2002
National Electrical Safety Code® Interpretations
NESC IR 526 (PDF)
Rule 110A1, 21 February 2002
National Electrical Safety Code® Interpretations
NESC IR 525 (PDF)
Rule 350F, 7 January 2002
National Electrical Safety Code® Interpretations
NESC IR 524 (PDF)
Rule 351C1, 3 October 2001
National Electrical Safety Code® Interpretations
NESC IR 523 (PDF)
Rule 235G, 31 July 2001
National Electrical Safety Code® Interpretations
NESC IR 522 (PDF)
Rule 442G, 28 February 2001
National Electrical Safety Code® Interpretations
NESC IR 521 (PDF)
Table 234-3, 11 July 2000
National Electrical Safety Code® Interpretations
NESC IR 520 (PDF)
Rule 261 D4a, 7 July 2000
National Electrical Safety Code® Interpretations
NESC IR 519 (PDF)
Rule 235F, 7 July 1999
National Electrical Safety Code® Interpretations
NESC IR 518 (PDF)
Rule 234D2, 9 September 1999
National Electrical Safety Code® Interpretations
NESC IR 509-517 (PDF)
National Electrical Safety Code® Interpretations 1997-1999, Eighth Interim Collection:
NESC IR 509, Rule 217B
NESC IR 510, Rule 235 and Table 235-6
NESC IR 511, Rule 239D
NESC IR 512, Table 235-5
NESC IR 513, Rule 97
NESC IR 514, Rule 220D and 220E
NESC IR 515, Rule 235C1, Table 235-5, Rule 235E1, Table 235-6
NESC IR 516, Rule 232A and 261H
NESC IR 517, Rule 314A, Rule 96C, Rule 354D
NESC IR 500-508 (PDF)
National Electrical Safety Code® Interpretations 1994-1997, Seventh Interim Collection:
NESC IR 500, Rule 234C3b
NESC IR 501, Rule 235-5, Footnote 6
NESC IR 502, Rule 93D1 and 93D2
NESC IR 503, Rule Definition: effectively grounded
NESC IR 504, Table 235-5
NESC IR 505, Rule 125B
NESC IR 506, Rule 235C1, Exception 1
NESC IR 507, Rule 110B2
NESC IR 508, Table 124-1
NESC IR 490-499 (PDF)
National Electrical Safety Code® Interpretations 1994-1996, Sixth Interim Collection:
NESC IR 490, Rule 350F
NESC IR 491, Rule 234F2a, Exception (3)
NESC IR 492, Rule 220B2e/Table 235-5
NESC IR 493, Rule 150
NESC IR 494, Rule 161A
NESC IR 495, Rule 234C4
NESC IR 496, Rule 261C2
NESC IR 497, Rule 230F16
NESC IR 498, Definition service drop & service point
NESC IR 499, Rule 350G
NESC IR 471-489 (PDF)
National Electrical Safety Code® Interpretations 1993-1995, Fifth Interim Collection:
NESC IR 471, Rule 350G
NESC IR 472, Rule 280A 1b
NESC IR 473, Rule 441
NESC IR 474, Rule 235C 2b
NESC IR 475, Rule 354 D1f
NESC IR 476, Rule 96C
NESC IR 477, Rule 441A 2b (1)
NESC IR 478, Rule 125A 3
NESC IR 479, Rule 261A 2b (1) (a)
NESC IR 480, Rule 344 A1
NESC IR 481, Rule 442E
NESC IR 482, Rule 171 and Rule 173A
NESC IR 483, Rule 99C
NESC IR 484, Rule 239G
NESC IR 485, Definition: communication line
NESC IR 486, Rule 441 A2
NESC IR 487, Rule 235
NESC IR 488, Table 232-1
NESC IR 489, Rule 92D2
NESC IR 463-470 (PDF)
National Electrical Safety Code® Interpretations 1991-1993, Fourth Interim Collection:
NESC IR 463, Rule 442E
NESC IR 464, Rule 442E
NESC IR 465, Rule 239G
NESC IR 466, Rule 97D
NESC IR 467, Rule 127L, Table 127-5
NESC IR 468, Rule 440
NESC IR 469, Rule 381G
NESC IR 470, Rule 232D4, Table 232-1 Footnote 8
NESC IR 448-454 (PDF)
National Electrical Safety Code® Interpretations 1991-1993
NESC IR 444-466 (PDF)
National Electrical Safety Code® Interpretations 1991-1993
NESC IR 442-451 (PDF)
National Electrical Safety Code® Interpretations 1991-1997
NESC IR 11-443 (PDF)
National Electrical Safety Code® Interpretations 1988-1990
NESC IR 11-415 (PDF)
National Electrical Safety Code® Interpretations 1984-1987
NESC IR 11-212 (PDF)
National Electrical Safety Code® Interpretations 1981-1984
NESC IR 11-283 (PDF)
National Electrical Safety Code® Interpretations 1978-1980
NESC IR 92-212 (PDF)
National Electrical Safety Code® Interpretations 1961-1977
NESC IR 92-293 (PDF)
National Electrical Safety Code® Interpretations 1943-1958
NESC IR 530 (PDF)
Rule 261D2a(2), 3 September 2002
National Electrical Safety Code® Interpretations
NESC IR 529 (PDF)
Rule 230I, 24 July 2002
National Electrical Safety Code® Interpretations
NESC IR 528 (PDF)
Rule 092E, 12 March 2002
National Electrical Safety Code® Interpretations
NESC IR 527 (PDF)
Rule 234C, 28 May 2002
National Electrical Safety Code® Interpretations
NESC IR 526 (PDF)
Rule 110A1, 21 February 2002
National Electrical Safety Code® Interpretations
NESC IR 525 (PDF)
Rule 350F, 7 January 2002
National Electrical Safety Code® Interpretations
NESC IR 524 (PDF)
Rule 351C1, 3 October 2001
National Electrical Safety Code® Interpretations
NESC IR 523 (PDF)
Rule 235G, 31 July 2001
National Electrical Safety Code® Interpretations
NESC IR 522 (PDF)
Rule 442G, 28 February 2001
National Electrical Safety Code® Interpretations
NESC IR 521 (PDF)
Table 234-3, 11 July 2000
National Electrical Safety Code® Interpretations
NESC IR 520 (PDF)
Rule 261 D4a, 7 July 2000
National Electrical Safety Code® Interpretations
NESC IR 519 (PDF)
Rule 235F, 7 July 1999
National Electrical Safety Code® Interpretations
NESC IR 518 (PDF)
Rule 234D2, 9 September 1999
National Electrical Safety Code® Interpretations
NESC IR 509-517 (PDF)
National Electrical Safety Code® Interpretations 1997-1999, Eighth Interim Collection:
NESC IR 509, Rule 217B
NESC IR 510, Rule 235 and Table 235-6
NESC IR 511, Rule 239D
NESC IR 512, Table 235-5
NESC IR 513, Rule 97
NESC IR 514, Rule 220D and 220E
NESC IR 515, Rule 235C1, Table 235-5, Rule 235E1, Table 235-6
NESC IR 516, Rule 232A and 261H
NESC IR 517, Rule 314A, Rule 96C, Rule 354D
NESC IR 500-508 (PDF)
National Electrical Safety Code® Interpretations 1994-1997, Seventh Interim Collection:
NESC IR 500, Rule 234C3b
NESC IR 501, Rule 235-5, Footnote 6
NESC IR 502, Rule 93D1 and 93D2
NESC IR 503, Rule Definition: effectively grounded
NESC IR 504, Table 235-5
NESC IR 505, Rule 125B
NESC IR 506, Rule 235C1, Exception 1
NESC IR 507, Rule 110B2
NESC IR 508, Table 124-1
NESC IR 490-499 (PDF)
National Electrical Safety Code® Interpretations 1994-1996, Sixth Interim Collection:
NESC IR 490, Rule 350F
NESC IR 491, Rule 234F2a, Exception (3)
NESC IR 492, Rule 220B2e/Table 235-5
NESC IR 493, Rule 150
NESC IR 494, Rule 161A
NESC IR 495, Rule 234C4
NESC IR 496, Rule 261C2
NESC IR 497, Rule 230F16
NESC IR 498, Definition service drop & service point
NESC IR 499, Rule 350G
NESC IR 471-489 (PDF)
National Electrical Safety Code® Interpretations 1993-1995, Fifth Interim Collection:
NESC IR 471, Rule 350G
NESC IR 472, Rule 280A 1b
NESC IR 473, Rule 441
NESC IR 474, Rule 235C 2b
NESC IR 475, Rule 354 D1f
NESC IR 476, Rule 96C
NESC IR 477, Rule 441A 2b (1)
NESC IR 478, Rule 125A 3
NESC IR 479, Rule 261A 2b (1) (a)
NESC IR 480, Rule 344 A1
NESC IR 481, Rule 442E
NESC IR 482, Rule 171 and Rule 173A
NESC IR 483, Rule 99C
NESC IR 484, Rule 239G
NESC IR 485, Definition: communication line
NESC IR 486, Rule 441 A2
NESC IR 487, Rule 235
NESC IR 488, Table 232-1
NESC IR 489, Rule 92D2
NESC IR 463-470 (PDF)
National Electrical Safety Code® Interpretations 1991-1993, Fourth Interim Collection:
NESC IR 463, Rule 442E
NESC IR 464, Rule 442E
NESC IR 465, Rule 239G
NESC IR 466, Rule 97D
NESC IR 467, Rule 127L, Table 127-5
NESC IR 468, Rule 440
NESC IR 469, Rule 381G
NESC IR 470, Rule 232D4, Table 232-1 Footnote 8
NESC IR 448-454 (PDF)
National Electrical Safety Code® Interpretations 1991-1993
NESC IR 444-466 (PDF)
National Electrical Safety Code® Interpretations 1991-1993
NESC IR 442-451 (PDF)
National Electrical Safety Code® Interpretations 1991-1997
NESCIR11-443 (PDF)
National Electrical Safety Code® Interpretations 1988-1990
NESCIR11-415 (PDF)
National Electrical Safety Code® Interpretations 1984-1987
NESCIR11-212 (PDF)
National Electrical Safety Code® Interpretations 1981-1984
NESCIR11-283 (PDF)
National Electrical Safety Code® Interpretations 1978-1980
NESCIR92-212 (PDF)
National Electrical Safety Code® Interpretations 1961-1977
NESCIR92-293 (PDF)
National Electrical Safety Code® Interpretations 1943-1958

Tentative Interim Amendments

A Tentative Interim Amendment (TIA) process allows interim changes to a particular NESC edition if they are deemed sufficiently critical. Tentative Interim Amendments are in effect through the conclusion of that specific edition and will be reconsidered for inclusion in the subsequent edition, during the next revision cycle process.

To submit a Proposal for a Tentative Interim Amendment (TIA), download (PDF) and email the completed form to: [email protected] for review.

In accordance with Section 10 of its procedures, the National Electrical Safety Code Committee has issued the following Tentative Interim Amendments (TIAs) for specific editions of the NESC.

View Tentative Interim Amendments

TIA 2017-1 (PDF)
Section 14
TIA 2007-5 (PDF)
Table 410-2
TIA 2007-4 (PDF)
Rule 215C5a
TIA 2007-3 (PDF)
Rule 261N
TIA 2007-2 (PDF)
Table 253-1 and -2
TIA 2007-1 (PDF)
Rule 110A2
TIA 2002-2 (PDF)
Table 232-2
TIA 2002-1 (PDF)
Rule 123C and 173C
TIA 1997-2 (PDF)
Table 253-2
TIA 1997-1 (PDF)
Rule 224B2 and 344A

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