The National Electrical Safety Code® (NESC®)

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


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.

In accordance with Section 13 of its Procedures, the National Electrical Safety Code Committee has issued the following Tentative Interim Amendments (TIAs) for specific editions of the NESC.

TIA 2007-5 (Table 410-2) PDF format

TIA 2007-4 (Rule 215C5a) PDF format

TIA 2007-3 (Rule 261N) PDF format

TIA 2007-2 (Table 253-1 and -2) PDF format

TIA 2007-1 (Rule 110A2) PDF format

TIA 2002-2 (Table 232-2) PDF format

TIA 2002-1 (Rule 123C and 173C) PDF format

TIA 1997-2 (Table 253-2) PDF format

TIA 1997-1 (Rule 224B2 and 344A) PDF format