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How much clearance should be provided for the distribution box

A minimum of 3 feet (36 inches) of clear working space in front, 30 inches width or the width of the equipment, and 6½ feet (2 meters) headroom is required around a distribution box.

Working Depth

The front clearance of a distribution box must be at least 3 feet (36 inches) for standard residential systems (0–150 V to ground), measured from the face of the equipment straight out. This ensures safe access for operation, maintenance, and emergency situations, allowing a worker to back away from live parts if necessary . For higher voltage systems or when live parts are on both sides, the required depth increases according to NEC 110.26 conditions: up to 4–5 feet for voltages above 600 V .

Working Width

The width of the working space must be the greater of 30 inches (762 mm) or the width of the distribution box itself. This space does not need to be centered but must allow full access to the equipment and permit doors or covers to open at least 90 degrees .

Headroom Clearance

The minimum headroom above the working space is 6½ feet (2 meters) or the height of the equipment, whichever is greater. No piping, ductwork, or other obstructions should intrude into this zone to ensure safe movement and prevent awkward working positions .

Practical Considerations
  • The working space must remain free of obstructions, including storage, shelving, or flammable materials .
  • Adequate lighting is required for safe operation and maintenance .
  • For distribution boxes integrated with modern systems like solar panels or EV chargers, maintaining these clearances ensures future-proofing and safety .
  • Minor projections like conduit or raceways may extend up to 6 inches into the working space, but nothing more .

By following these clearance requirements, you ensure compliance with NEC 110.26, safe access for electricians, and reduced risk of electrical hazards.

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(B) The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to

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(B) The space equal to the width and depth of the equipment shall be kept clear of foreign systems unless protection is provided to

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Keep the working space clear from the floor or grade up to 6 ft 6 in. (2.0 m) or the height of

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For typical residential systems operating at 120/240 volts, the minimum required depth is 3 feet, or 36 inches. This

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Technical note

This reference is intended for preliminary specialty-cable research. Compatibility, link budgets, fire performance, installation methods, test limits and applicable standards must be verified for the specific project.

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