OSHA electrical panel clearance requirements, set out in 29 CFR 1910.303, require at least 3 feet of clear working space in front of every panel, with wider minimums at higher voltages and in riskier layouts. The rule also fixes the width, headroom, lighting, and exit paths around the panel, and those minimums must be maintained at all times, not just when someone is working on the equipment.
Depth of Working Space at 600 Volts or Less
OSHA measures depth from the front of the enclosure, or from any exposed live parts if the equipment is open. For systems at 600 volts or less, the required depth turns on what sits opposite the live parts. OSHA calls these Condition A, B, and C.1eCFR. 29 CFR Part 1910 Subpart S – Electrical
Condition A covers the safest layout: exposed live parts on one side and no live or grounded parts on the other, or live parts on both sides that are effectively insulated. The minimum depth is 3 feet at any voltage up to 600.
Condition B applies when the opposite surface is grounded, such as a concrete, brick, or tile wall. At 150 volts or less, the minimum is still 3 feet. Between 151 and 600 volts, it rises to 3 feet 6 inches.
Condition C is the worst case: exposed live parts on both sides of the worker. At 150 volts or less, 3 feet is enough. Between 151 and 600 volts, the minimum is 4 feet so a worker can move away from either side without contact.
Depth of Working Space Above 600 Volts
High-voltage equipment uses the same three-condition framework, with the numbers climbing sharply as voltage rises.2Occupational Safety and Health Administration. 1910.303 – General
- 601 to 2,500 volts: 3 feet (A), 4 feet (B), 5 feet (C)
- 2,501 to 9,000 volts: 4 feet, 5 feet, 6 feet
- 9,001 to 25,000 volts: 5 feet, 6 feet, 9 feet
- Over 25,000 to 75,000 volts: 6 feet, 8 feet, 10 feet
- Above 75,000 volts: 8 feet, 10 feet, 12 feet
Width, Headroom, and Door Swing
The clear space in front of a panel has to be at least 30 inches wide, or as wide as the equipment itself if the equipment is wider.2Occupational Safety and Health Administration. 1910.303 – General That width has to run the full face of the equipment, with no shelving, carts, or tool racks encroaching from the sides.
Every hinged panel and door must be able to swing to at least 90 degrees without hitting a wall, cabinet, or another obstruction. This is one of the most commonly missed clearance rules because a nearby fixture can silently block a door for years.
Headroom above the working space must be at least 6 feet 6 inches, or the height of the equipment if it stands taller. Conduit, cable trays, and ductwork cannot intrude into that vertical envelope.
Dedicated Space Around the Equipment
Separate from the working clearance in front, OSHA requires a dedicated electrical space around switchboards, panelboards, distribution boards, and motor control centers. This space has two zones with different rules.2Occupational Safety and Health Administration. 1910.303 – General
The lower zone runs from the floor to a point 6 feet above the equipment, or to the structural ceiling if that is lower. It must stay completely clear of piping, ducts, storage, and anything else not part of the electrical installation.
The upper zone runs from the top of the equipment to the structural ceiling. Foreign systems such as piping and ductwork are allowed there only if they are protected against condensation, leaks, or breaks that could damage the electrical equipment below. A suspended or dropped ceiling does not count as the structural ceiling, so the dedicated space keeps going past it to the actual building structure.3GovInfo. 29 CFR 1910.303 – General
Two exceptions matter in practice. Sprinkler protection piping is permitted within the dedicated space. And equipment that is itself part of the electrical installation can extend up to 6 inches beyond the front of the panel into the working space.
Lighting
Every indoor working space around service equipment, switchboards, panelboards, and motor control centers must be illuminated. A dedicated fixture directly over the panel is not required; an adjacent light that adequately illuminates the working area satisfies the rule.2Occupational Safety and Health Administration. 1910.303 – General
Illumination in electrical equipment rooms cannot be controlled solely by automatic means. A motion sensor that shuts the lights off when it stops detecting movement is not compliant on its own, because a worker could be left in the dark while working on energized equipment. There has to be a manual switch or override.
For equipment operating above 600 volts, lighting fixtures have to be positioned so that changing a lamp or repairing the light does not expose the worker to live parts, and switches must be located where a person cannot accidentally contact live or moving parts while turning them on.
Entrances and Exits
The working space around electrical equipment needs at least one entrance sized for a person to move through safely. The minimum entrance opening is 24 inches wide and 6 feet 6 inches tall, and the path in and out must stay clear.1eCFR. 29 CFR Part 1910 Subpart S – Electrical
Larger installations trigger a two-exit rule. Where equipment is rated at 1,200 amperes or more and is over 6 feet wide, OSHA generally requires an entrance at each end of the working space so an arc flash or fire at one end does not trap the worker.2Occupational Safety and Health Administration. 1910.303 – General The second entrance can be omitted in two cases: when the layout gives a continuous unobstructed exit path that does not require passing in front of the equipment, or when the depth of the working space is doubled beyond the Table S-1 minimum.
Doors serving equipment rated at 1,200 amperes or more must swing outward, in the direction of egress, so a worker can push through in an emergency. OSHA’s exit route standards separately allow panic bar hardware on exit discharge doors.4Occupational Safety and Health Administration. 1910.36 – Design and Construction Requirements for Exit Routes
Penalties for Blocked or Non-Compliant Panels
Blocked electrical panels are among the most commonly cited electrical hazards in OSHA inspections, and clearance violations are usually classified as serious because an obstructed panel directly raises the risk of electrocution or arc flash injury. As of January 2025, the maximum penalties are:5Occupational Safety and Health Administration. OSHA Penalties
- Serious violation: up to $16,550 per violation where there is a substantial probability of death or serious physical harm.
- Willful or repeated violation: up to $165,514 per violation for employers who knowingly disregard the requirement or have been cited for the same hazard before.
- Failure to abate: up to $16,550 per day for each day the violation continues past the correction deadline.
These are per-violation figures. A facility with four blocked panels can be cited four separate times.
A Note on Construction Sites
Everything above comes from the general industry standard at 29 CFR 1910.303. Construction work is governed instead by 29 CFR 1926 Subpart K, which uses the same 3-foot baseline and the same three-condition framework but differs in some details, including a minimum headroom of 6 feet 3 inches around panelboards and additional protection rules for damp or wet locations.6eCFR. 29 CFR Part 1926 Subpart K – Electrical If your work is on a construction site, check that standard rather than 1910.