I have a High School customer that is putting up a new marquee sign. It is approximately 100' from the building across the parking lot. They really don't want a disconnect on the sign. Could I put a single pole light switch on the sign that operates a lighting contactor back at the building? The sign requires (3) seperate 20a, 120v circuits. The closest panel is 1ph. Do I have to simultaneous disconnect the branch circuits ahead of the contactor?