During construction, a builder needs to install temporary electrical service. According to Michigan electrical requirements, what is the minimum height above grade for overhead service conductors crossing a driveway?
Correct Answer
C) 12 feet
Michigan adopts NEC requirements for 12 feet minimum clearance over driveways for overhead service conductors.
Why This Is the Correct Answer
Michigan adopts the National Electrical Code (NEC), which specifies a minimum clearance of 12 feet above grade for overhead service conductors crossing driveways and areas accessible only to pedestrians and passenger vehicles. This height provides adequate clearance for standard vehicles.
Why the Other Options Are Wrong
Option A: 10 feet
10 feet is the NEC minimum clearance for areas accessible only to pedestrians — not driveways. Applying the pedestrian clearance to a driveway would create a hazard for vehicles.
Option B: 15 feet
15 feet is not a standard NEC clearance threshold. This number may be confused with the 15-foot clearance required for certain public roads or with other utility clearance requirements.
Option D: 18 feet
18 feet is the NEC minimum clearance for conductors over public streets, alleys, roads, and parking areas subject to truck traffic — not for private driveways. Using 18 feet for a driveway overapplies the requirement for heavy vehicle areas.
Memory Technique
Match height to vehicle type: pedestrians = 10 ft, cars on driveways = 12 ft (think: a pickup truck is about 6.5 ft tall, and 12 ft gives double clearance), trucks on public roads = 18 ft. '12 for the drive, 18 for the highway.'
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A homeowner wants to install a gas fireplace in their living room. The contractor notices the existing gas line is 1/2 inch black iron pipe. For a 40,000 BTU fireplace with a 25-foot run, is this pipe size adequate according to Michigan gas code?
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