A minimum of 3 feet (approximately 0.9 meters) of clear space must be maintained in front of all distribution boxes, panelboards, switchgear, and transformers to allow safe access for maintenance, inspection, and emergency operations. Doors and panels must be able to open at least 90 degrees without obstruction, ensuring personnel can safely work or move away in case of an incident .
The side-to-side working space should be at least 30 inches (0.76 meters) or the width of the equipment, whichever is greater. This ensures safe lateral access for adjustments, inspections, and emergency interventions .
The minimum headroom in front of the equipment should be 6½ feet (2 meters) or the height of the equipment, whichever is greater. This clearance prevents personnel from being trapped and allows safe movement around the equipment .
| Clearance Type | Minimum Requirement |
|---|---|
| Front | 3 ft (0.9 m) |
| Side | 30 in (0.76 m) or equipment width |
| Height | 6½ ft (2 m) or equipment height |
| Aisle (live parts both sides) | 4 ft (1.2 m) minimum |
| High-voltage / high-amp equipment | 1.5 m (5 ft) front, additional exits |
Maintaining these clearances ensures safe operation, inspection, and maintenance of distribution boxes while complying with NEC, IEC, and local building codes .
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