A rooftop unit motor has a running amp value on the equipment submittal and a much higher starting demand. What should the GC coordinate before rough-in?
Correct Answer
C) Confirm motor starters, disconnects, conductors, and protection are coordinated with the approved equipment data
Motors affect both mechanical equipment placement and electrical distribution. Before rough-in, the GC should coordinate starters, disconnects, conductors, and protection with the approved equipment data, including starting characteristics. Ignoring starting demand or waiting until set day risks rework.
Why This Is the Correct Answer
Motors affect both mechanical equipment placement and electrical distribution. Before rough-in, the GC should coordinate starters, disconnects, conductors, and protection with the approved equipment data, including starting characteristics. Ignoring starting demand or waiting until set day risks rework.
Why the Other Options Are Wrong
Option A: Ignore motor starting because it affects only the mechanical contractor
Motor starting affects the electrical system even though the equipment is mechanical, so it cannot be left outside electrical coordination.
Option B: The coordinator should use the nameplate running amps as the only electrical coordination item
Running amps alone omit starter, disconnect, conductor, protection, and starting-demand coordination shown in the approved submittal data.
Option D: Delay electrical coordination until the unit is set on the roof
Waiting until the unit is on the roof means raceways, disconnect locations, and feeder work may already be wrong.
Memory Technique
Tag the scene with motor equipment coordination: wrong actor or wrong timing means the fix is not Confirm motor starters, disconnects, conductors, and protection are coordinated with the approved equipment data.
Reference Hint
Open Mechanical and Electrical Systems for Construction Managers, 4th Ed., 2024; use by topic index - motors / equipment coordination to confirm that Motors affect both mechanical equipment placement and electrical distribution.
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