What is the clearance for electrical enclosures
Find out the required clearance dimensions around electrical enclosures for safe access, based on NEC and OSHA regulations.
Spacing requirements for side-by-side distribution boxes
The minimum side-to-side clearance for electrical distribution boxes is generally 30 inches, or at least the width of the equipment, to ensure safe access and maintenance.Side Clearance RequirementsFor side-by-side electrical panels or distribution boxes, the National Electrical Code (NEC) and OSHA specify that there must be a minimum of 30 inches of clearance from the sides of all electrical equipment, or at least the width of the equipment itself, whichever is greater. This ensures that personnel can safely access, operate, and maintain the equipment without risk of contact with live parts or obstruction during emergencies (NEC Article 110.26, OSHA guidelines) . The panels do not need to be centered within this space; for example, you can have 10 inches on one side and 20 inches on the other, as long as the total clearance is maintained .Front and Height ClearancesIn addition to side clearances, front clearance is required to allow safe operation and door opening. The minimum front clearance is typically 36 inches for non-electrical walls, 42 inches if facing a grounded surface, and 48 inches if facing another panel or electrical equipment . Height clearance in front of the equipment must be at least 78 inches (6′ 6″) to allow safe standing and operation .Distribution Block SpecificsFor power distribution blocks (PDBs) and terminal blocks, UL standards specify spacing between live parts. At 600V, the required spacing is 1 inch through air and 2 inches over surface for feeder circuits, ensuring safe separation between uninsulated live parts and grounded or opposite-polarity parts . Listed PDBs (UL1953) meet these spacing requirements for most OEM and field applications, while recognized terminal blocks (UL1059) must be verified for compliance with the specific application .Practical ConsiderationsEnsure panel doors can open at least 90 degrees without obstruction.Maintain unobstructed access paths to all panels for emergency and maintenance purposes.For rows of equipment with live parts on both sides, aisles must be at least 4 feet wide, increasing with higher voltages .Always check the equipment nameplate for manufacturer-specific clearance requirements, as these may exceed code minimums . Maintaining these clearances is critical for worker safety, compliance with NEC and OSHA standards, and proper equipment operation.
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