Electrical Service Upgrade and Accessibility in a Renovated Clinic
A 4,000 sq ft medical clinic renovation adds imaging equipment that raises the connected load beyond the existing 200 A, 120/240 V single-phase service. The electrical contractor proposes a new 400 A service with a panel located in a converted storage room. The room is 6 ft by 8 ft, accessed through a 30 in. door with a 24 in. clear opening, and the panel is mounted with its centerline at 6 ft 8 in. above the floor, with a 30 in. wide by 36 in. deep clear working space that is partly blocked by a water heater. The clinic also adds an accessible exam room and a new accessible route from the parking lot. The building official flags the electrical room and the accessible route for review.
1. Evaluate the electrical working space and panel accessibility. What corrections are required?
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The working space is deficient on several counts. The clear working space in front of the panel must be at least 30 in. wide, 36 in. deep, and 6 ft 6 in. high, and it must be dedicated to the electrical equipment; the water heater intrudes into that space, so it must be relocated or the panel moved. The panel centerline at 6 ft 8 in. is too high: the highest breaker handle should be no more than 6 ft 7 in. above the floor, and the panel should be mounted so the top of the highest breaker is within reach; a centerline at 6 ft 8 in. likely puts the top breakers above the limit. The panel should be lowered.
Accessibility also applies because the room serves a public accommodation. The 24 in. clear door opening is below the 32 in. clear width required for an accessible route, so the door and frame must be widened or replaced. The room must have a level, firm, slip-resistant floor and adequate maneuvering clearance at the door. The designer should revise the plan to relocate the water heater, lower and reposition the panel, widen the door, and show the working space dimensions and door clearances on the electrical and architectural drawings.
2. What must be shown for the new accessible route and exam room, and how does the service upgrade interact with it?
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The accessible route from the parking lot must be an exterior route at least 36 in. wide (44 in. where the route serves as an accessible means of egress or where required), with a maximum running slope of 1:20 and cross slope of 1:48, level landings at doors, and a firm, stable, slip-resistant surface. Accessible parking spaces must connect to the route without a curb step; curb ramps, detectable warnings at the street, and signage are required. At the building entrance, the door must provide 32 in. clear width, a level landing, and compliant hardware and thresholds.
The exam room must have a 36 in. clear turning space or a compliant clear floor space at the exam table, an accessible door with 32 in. clear width, and accessible controls and outlets within reach ranges (typically 15 to 48 in. above the floor). The new imaging equipment and service upgrade must not block the route or the clear floor spaces. The designer should coordinate the electrical room relocation and the accessible route on a single plan set, showing dimensions, slopes, and clearances, and should confirm that the new service equipment does not encroach on required accessible parking or the route.