A builder is constructing a house where the electrical service panel will be located in a basement with a concrete floor. What is the minimum working clearance width required in front of the panel according to Michigan electrical standards?
Correct Answer
D) 36 inches
Michigan adopts the NEC requirement of 36 inches minimum working clearance width in front of electrical panels.
Why This Is the Correct Answer
Michigan adopts the NEC (Article 110.26), which requires a minimum working clearance width of 36 inches in front of electrical panels and other electrical equipment. This 36-inch (3-foot) width ensures a safe working zone for electricians to operate safely in front of energized equipment.
Why the Other Options Are Wrong
Option A: 30 inches
30 inches is a common distractor because it equals the minimum width of many doorways and passageways. However, NEC requires 36 inches of clearance width in front of electrical panels — 30 inches is not sufficient.
Option B: 24 inches
24 inches is far too narrow for the required working clearance in front of an electrical panel. This distance (2 feet) would not provide a safe working zone and does not comply with NEC Article 110.26.
Option C: 42 inches
42 inches exceeds the required minimum of 36 inches. While more space would be acceptable, 42 inches is not the NEC-specified minimum width and may reflect confusion with depth clearance requirements in higher-voltage scenarios.
Memory Technique
NEC panel clearance = '3-3-6': 3 feet deep, 3 feet wide (36 inches). Or simply remember 'Panels need 3 feet of room in front and 3 feet wide.' The concrete floor mentioned in the question is a red herring — concrete doesn't change the clearance requirement.
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