Panelboard Working Space and Dedicated Equipment Space in a Garage
A 200 A panelboard is mounted in a garage on a wall beside a 50 gal electric water heater. The panel is 14 in wide and 30 in tall; its top is 6 ft above the floor. The water heater sits directly in front of the panel, leaving 30 in of clear depth from the panel face to the heater jacket. A wooden shelf is installed 5 ft 10 in above the floor and extends 12 in out from the wall directly above the panel; storage bins sit on it. The garage ceiling is 8 ft. The panel is 120/240 V single-phase. The homeowner wants to add a 60 A EV charger and asks whether the panel location is acceptable and whether the shelf can stay. The inspector has cited 110.26. The electrician proposes to move the water heater 12 in to the side and trim the shelf back to 6 in deep.
1. Determine the required working-space width, depth, and height for this panel, and compare them with the existing conditions.
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The panel is a 120/240 V single-phase panelboard, so the voltage to ground is 120 V. For this voltage, the working-space depth is 36 in. The width must be at least 30 in or the width of the equipment, whichever is greater; the panel is 14 in wide, so 30 in applies. The height must be at least 6 ft 6 in, or the height of the equipment if greater, measured from the floor. Existing conditions: the water heater leaves only 30 in of clear depth, so the 36 in depth is not met. The 30 in width may be available, but it must be clear for the full working space. The 6 ft 6 in height is obstructed by the shelf at 5 ft 10 in, which is within the required working-space height and directly above the panel. The shelf must be removed or relocated, not merely trimmed.
2. Does the 110.26(E) dedicated equipment space change the answer about the shelf and the water heater?
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Yes. The dedicated equipment space for an indoor panelboard extends from the floor to 6 ft above the top of the equipment, and it must be at least 30 in wide and 36 in deep. The shelf at 5 ft 10 in is foreign equipment installed above the panel and within the dedicated space; trimming it to 6 in deep does not cure the violation because the space must be kept clear. The water heater is also in the working space in front of the panel and prevents the required 36 in depth. Moving the water heater 12 in to the side may or may not clear the full 30 in width and 36 in depth; the electrician must field-verify the final dimensions and keep the panel's working space clear. Because the panel top is 6 ft and the ceiling is 8 ft, a shelf cannot be installed above the panel without violating the dedicated-space requirement.
3. What should the electrician do before adding the 60 A EV charger, and what would you tell the homeowner?
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The electrician should correct the panel access first: relocate the water heater so the full 36 in depth and 30 in width are clear, remove the shelf and storage from the dedicated equipment space, and verify that the panel can be accessed without standing on or reaching over equipment. Only then should the electrician evaluate the 60 A EV charger load, conductor size, breaker size, disconnect requirements, and panel capacity. The homeowner should be told that the panel location is not acceptable as-is, that trimming the shelf is not enough, and that the inspection will fail until the working space and dedicated space are clear. Moving the water heater may be part of the solution, but the final layout must be measured; if the garage cannot provide the clear space, the panel may need to be relocated.