National Electrical Safety Code (NESC®)

The one-stop resource for the National Electrical Safety Code®.

NESC INTERPRETATIONS

NESC Interpretations are available for download at no charge. If you do not see the interpretation you need, fill out the NESC Interpretation Request Form. (.doc)

NESC IR 571 PDF format Rule 235C2b., 17 December 2012
National Electrical Safety Code® Interpretations

NESC IR 570 PDF format Rule 094B., 17 December 2012
National Electrical Safety Code® Interpretations

NESC IR 569 PDF format Rule 215C4b., 2 October 2012
National Electrical Safety Code® Interpretations

NESC IR 568 PDF format Rule 410.A.3.b., 3 May 2012
National Electrical Safety Code® Interpretations

NESC IR 567 PDF format Rule 250C & 261A1c, 13 March 2012
National Electrical Safety Code® Interpretations

NESC IR 566 PDF format Rule 235C2b(1)(c)i, 26 March 2012
National Electrical Safety Code® Interpretations

NESC IR565 PDF format Section 2: Definitions - Sag, 10 April 2012
National Electrical Safety Code® Interpretations

NESC IR564 PDF format Rule 215C1, 15 November 2011
National Electrical Safety Code® Interpretations

NESC IR563 PDF format Rule 236G, 15 November 2011
National Electrical Safety Code® Interpretations

NESCIR561 PDF format Rule 261A2a, 11 May 2010
National Electrical Safety Code® Interpretations

NESC IR560 PDF format Rule 235C1a, 235E1, 15 Nov 2011
National Electrical Safety Code® Interpretations

NESCIR559 PDF format Rule 096C, 6 October 2009
National Electrical Safety Code® Interpretations

NESCIR558 PDF format Rule 410A3, 14 January 2009
National Electrical Safety Code® Interpretations

NESCIR557 PDF format Rule 410A3, 14 January 2009
National Electrical Safety Code® Interpretations

NESCIR556 PDF format Rule 261C, 29 October 2008
National Electrical Safety Code® Interpretations

NESCIR555 PDF format Rule 341B1c, 29 October 2008
National Electrical Safety Code® Interpretations

NESCIR554 PDF format Rule 444D, 29 October 2008
National Electrical Safety Code® Interpretations

NESCIR553 PDF format Rule 384C, 29 October 2008
National Electrical Safety Code® Interpretations

NESCIR552 PDF format Rule 215C1, 11 July 2008
National Electrical Safety Code® Interpretations

NESCIR551 PDF format Rule 215C5b, 20 January 2009
National Electrical Safety Code® Interpretations

NESCIR550 PDF format Rule 215C1, 20 March 2008
National Electrical Safety Code® Interpretations

NESCIR549 PDF format Rule 260B, 261A1b; Table 261-1A, 19 Mar 2008
National Electrical Safety Code® Interpretations

NESCIR548 PDF format Rule 013B3, 26 March 2009
National Electrical Safety Code® Interpretations

NESCIR547 PDF format Rule 092B1, 14 January 2008
National Electrical Safety Code® Interpretations

NESCIR546 PDF format Rule 110B2, 30 March 2007
National Electrical Safety Code® Interpretations

NESCIR545 PDF format Rule 232 & Table 232-1, 31 Jan 2007
National Electrical Safety Code® Interpretations

NESCIR544 PDF format Rule 410A3, 24 January 2007
National Electrical Safety Code® Interpretations

NESCIR543 PDF format Rule 234 & Table 234-1, 5 July 2006
National Electrical Safety Code® Interpretations

NESCIR542 PDF format Rule 111A & Table 111-1, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR541 PDF format Rule 234C3d, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR540 PDF format Rule 441 & Table 441-1, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR539 PDF format Rule 092E, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR538 PDF format Rule 252A and 251A3, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR537 PDF format Rule 234 & Table 234-1, 16 Dec 2005
National Electrical Safety Code® Interpretations

NESCIR536 PDF format Rule 017B & 094B2, 23 May 2005
National Electrical Safety Code® Interpretations

NESCIR535 PDF format Rule 233 Table 233-1, 23 May 2005
National Electrical Safety Code® Interpretations

NESCIR534 PDF format Rule 381G2, 23 May 2005
National Electrical Safety Code® Interpretations

NESCIR533 PDF format Rule 230C1, 6 February 2004
National Electrical Safety Code® Interpretations

NESCIR532 PDF format Rule 096C, 25 August 2003
National Electrical Safety Code® Interpretations

NESCIR531 PDF format Rule 279A2a, 25 August 2003
National Electrical Safety Code® Interpretations

NESCIR530 PDF format Rule 261D2a(2), 3 September 2002
National Electrical Safety Code® Interpretations

NESCIR529 PDF format Rule 230I, 24 July 2002
National Electrical Safety Code® Interpretations

NESCIR528 PDF format Rule 092E, 12 March 2002
National Electrical Safety Code® Interpretations

NESCIR527 PDF format Rule 234C, 28 May 2002
National Electrical Safety Code® Interpretations

NESCIR526 PDF format Rule 110A1, 21 February 2002
National Electrical Safety Code® Interpretations

NESCIR525 PDF format Rule 350F, 7 January 2002
National Electrical Safety Code® Interpretations

NESCIR524 PDF format Rule 351C1, 3 October 2001
National Electrical Safety Code® Interpretations

NESCIR523 PDF format Rule 235G, 31 July 2001
National Electrical Safety Code® Interpretations

NESCIR522 PDF format Rule 442G, 28 February 2001
National Electrical Safety Code® Interpretations

NESCIR521 PDF format Table 234-3, 11 July 2000
National Electrical Safety Code® Interpretations

NESCIR520 PDF format Rule 261 D4a, 7 July 2000
National Electrical Safety Code® Interpretations

NESCIR519 PDF format Rule 235F, 7 July 1999
National Electrical Safety Code® Interpretations

NESCIR518 PDF format Rule 234D2, 9 September 1999
National Electrical Safety Code® Interpretations

NESCIR509-517 PDF format
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

NESCIR500-508 PDF format
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

NESCIR490-499 PDF format
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

NESCIR471-489 PDF format
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

NESCIR463-470 PDF format
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