(a) Except as provided by Subsection (c), the National Electrical Code, as it existed on May 1, 2001, is adopted as the municipal electrical construction code in this state and applies to all residential and commercial electrical construction applications.
(b) A municipality may establish procedures:
(1) to adopt local amendments to the National Electrical Code; and
(2) for the administration and enforcement of the National Electrical Code.

(c) The National Electrical Code applies to all commercial buildings in a municipality for which construction begins on or after January 1, 2006, and to any alteration, remodeling, enlargement, or repair of those commercial buildings.