Michigan Compiled Laws, Chapter 339. Occupational Code § 339.5703

(i) Except as otherwise provided in subparagraphs (i), (ii), (iii), and (iv), that portion of the electric sign wiring that originates at the load-side terminals of a disconnecting means located in the vicinity of the electric sign involved but does not include the installation of the disconnecting means, complete with line-side connections.

(ii) In the case of electric sign installations that have sign transformers installed physically apart from the electric sign, that portion of the electric sign wiring that originates at the load-side terminals of a disconnecting means located in the vicinity of the electric sign involved but does not include the installation of the disconnecting means, complete with line-side connections.

(iii) In the case of free-standing electric sign installations supplied through underground circuit conductors, that portion of the electric sign wiring that originates at a wiring termination point adjacent to, within, or immediately above the permanent base for the electric sign but does not include, if the base of the sign structure is suitable for use as a raceway, the installation of bushing, complete with free-length circuit conductors extending through to accommodate the connection of the related wiring within the sign structure raceway.

(iv) In the case of electric signs specifically designed to be connected directly to the building wiring raceway or cable supply, that portion of the electric sign wiring that originates at the point where the free-length circuit conductors extend through the building wiring raceway or cable at the specifically designed supply location for the electric sign involved but does not include the installation of the building wiring raceway or cable system to the specifically designated point of supply for the electric sign involved, complete with free-length circuit conductors extending through the building wiring raceway or cable to accommodate the connection of the related wiring.