Electrical
Electrical working clearance field guide: NEC 110.26 working space
Hold the clear space in front of the gear: the depth by voltage and condition, the width and height, the dedicated space above, the egress, and the storage that fails the inspection.
Direct answer
Working space is the clear area the NEC requires in front of electrical equipment likely to be worked on while energized, so a worker can stand, move, and get clear without contacting live parts. Depth runs at least 3 ft and grows with voltage and condition. The adopted code edition controls the exact dimension.
Key takeaways
- NEC 110.26 working space is the clear area in front of energized gear so a worker can stand, work, and escape an arc.
- Working depth starts at 3 ft and grows with voltage and condition; for 0 to 150 V to ground it is 3 ft for all conditions.
- Width is 30 in or the equipment width, whichever is greater, with any door able to open at least 90 degrees.
- Headroom must be clear to 6.5 ft or the equipment height, measured from the face of the enclosure out into the room.
- Storing anything in the working space violates 110.26 and is the most common real-world failure; dedicated space above runs to 6 ft, free of foreign piping and duct.
Working space, and the space the code reserves
Working space is the clear area the NEC requires in front of electrical equipment that is likely to be examined, adjusted, serviced, or maintained while energized. It is room for a person to stand square to the gear, swing a tool, read a meter, and step back out without backing into something or reaching across a live bus. The space is not a courtesy. It is part of the installation, the same as the conductors and the overcurrent device, and the gear is not code-complete without it.
The rules live in NEC 110.26, Spaces About Electrical Equipment. The section sets a depth in front of the gear, a width, a height of clear headroom, an entrance and egress requirement, illumination, and a separate dedicated space above the equipment. Each one is its own dimension with its own reason, and they get measured separately at inspection.
Here is the part that gets lost. Working space is not just for the install. It exists for every time someone opens that gear for the next twenty years, usually with it energized, sometimes in a hurry. The clearance you protect on day one is the room the next person has to work in and the room they have to get out of when an arc lets go. That is why storage creeping into it, or another trade hanging a pipe through the space above it, is not a paperwork problem. It takes away the room a person needs to survive the gear.
Why the clear space is room to work and room to escape
Two things happen in front of energized gear, and the working space serves both. The first is the work itself. A worker needs to stand far enough back that no part of them and nothing they are holding contacts a live part behind or beside them, and they need width to move and height to stand up straight. Cramp that space and the work gets done leaning, twisting, and reaching, which is exactly how a tool or a forearm finds a phase.
The second is the escape. When a fault goes to an arc, the worker has a fraction of a second to get away from a blast of pressure, molten metal, and heat that can pass several thousand degrees. The depth in front and the egress out of the space are what let them move back and get to a door instead of being pinned against a wall of boxes. The clearance is the difference between a bad day and a fatality.
It is also one of the most-cited violations in the trade, and the most-failed at the same time, because the space passes at rough-in and then fills up. Other crews stage material in front of the panel. A facility stores a ladder and a mop bucket against the gear. A pipefitter runs a line through the dedicated space above. Every one of those is a 110.26 violation, and they keep happening because the space looks like empty floor to everyone who is not the electrician.
How much clearance does an electrical panel need?
The minimum depth in front of the gear starts at 3 ft and grows with the voltage and the condition across from it. For equipment operating at 0 to 150 V to ground, which covers the common 120/240 V and 120/208 V panels, the depth is 3 ft for all three conditions. Above that voltage band the required depth increases, and the worse the condition opposite the gear, the deeper it gets. Those numbers come from Table 110.26(A)(1), and that table is what controls, not the round number people carry in their head.
Read the table by two inputs: the voltage to ground of the equipment, and the condition (1, 2, or 3) that describes what is on the other side of the working space. The 3 ft figure everyone quotes is the floor for low-voltage gear with nothing grounded in front of it. A 480 V switchboard facing a concrete wall is in a different row and needs more.
Confirm the exact dimension against the edition the jurisdiction has adopted and any local amendments, because the voltage bands and the depths have been adjusted across code cycles. The values below are the common ones, listed to show the shape of the table, not as a substitute for the adopted code.
| Nominal voltage to ground | Condition 1 | Condition 2 | Condition 3 |
|---|---|---|---|
| 0 to 150 V | 3 ft | 3 ft | 3 ft |
| 151 to 600 V | 3 ft | 3.5 ft | 4 ft |
| Above 600 V | Greater, per the table | Greater, per the table | Greater, per the table |
Condition 1, 2, and 3, and what sets them apart
The condition is not about the gear. It is about what is across the working space from the gear, because that is what a worker can be pushed or thrown into. The code splits it into three.
Condition 1 is the easy one: exposed live parts on one side and nothing live or grounded on the other, or live parts on both sides that are guarded by insulation. Think of a panel on a wood-stud wall with drywall facing it, nothing grounded behind the worker. Condition 2 is exposed or enclosed live parts on one side and grounded parts on the other. The classic case is a panel facing a concrete, masonry, or tile wall, or a run of grounded pipe. Condition 3 is exposed or enclosed live parts on both sides of the space, which is two lineups facing each other across one shared aisle, or live gear on one side and a grounded condition that the code treats as live on the other.
The logic is straight: the more ways a worker can complete a circuit to ground or to another phase if they fall or get thrown, the more room the code gives them to avoid it. That is why Condition 3 is deepest. The aisle between two facing lineups is the worst place to be when one of them faults, so it gets the most space.
What counts as grounded across the space
Condition 2 turns on whether the surface across from the gear is grounded, so it pays to know what the code counts. Concrete, brick, and tile walls are treated as grounded, even though they are not bonded conductors, because a person against a damp masonry wall is a path to earth. A grounded metal surface counts. So does a run of grounded piping, a grounded enclosure, or another piece of grounded equipment sitting across the aisle.
What does not push you into Condition 2 is an ordinary insulating wall with nothing grounded behind it, like a framed and drywalled partition. That stays Condition 1, which is why an interior panel on a stud wall often gets the 3 ft minimum while the same panel facing a poured foundation wall has to be looked at as Condition 2.
The mistake here is reading the finished surface and missing what is behind it or beside it. A drywall wall with a grounded water line running its face, or a column wrapped in finish over structural steel, can be a grounded condition that the drywall hides. When the call is close, treat the masonry, the pipe, and the steel as grounded and give the deeper number. The cost of the extra room is cheap next to a re-set.
Where the depth is measured from
The depth is measured from the live parts, or from the front of the enclosure or opening if the live parts are inside a cabinet. For a normal panelboard or switchboard with a deadfront, that means you measure from the face of the enclosure out into the room, not from the wall behind the gear and not from the back of the can.
The clear space runs from the floor up to the required height, and it has to be clear the whole way, not just at waist level. A shelf at head height over the panel, a pipe at knee height in front of it, a transformer or another cabinet set into the aisle, all of those eat the depth even if the floor in front looks open.
One more that catches people: the working space of one piece of gear cannot be the body of another piece of gear. You cannot stand a second panel inside the 3 ft in front of the first and call both clear. Each piece of equipment likely to be worked on energized owns its own working space, and those spaces cannot be the same square of floor.
The width: 30 in or the equipment, whichever is more
The width of the working space is 30 in, or the width of the equipment, whichever is greater. A 24 in wide panel still gets a 30 in wide working space. A 42 in wide switchboard gets at least 42 in. The width is measured along the face of the gear, and the 30 in is a clear minimum, not a target.
The width does not have to be centered on the gear. It can run from the edge of the equipment to either side, as long as a full 30 in (or the equipment width) of clear space exists somewhere across the front. That flexibility helps when a panel sits near a corner, but it does not let you shrink the number.
The width also has to allow any hinged door or panel on the gear to open at least 90 degrees. A panel door that only opens 60 degrees because a wall or a duct is in the way fails, even if the flat clearance numbers check out. And nothing about width lets you block the path: the 30 in is room to stand and work, so a column, a pipe, or a stacked pallet inside that width is a violation the same as one in the depth.
The height of the working space
The working space has to be clear from the floor up to a height of 6.5 ft, or the height of the equipment, whichever is greater. Tall gear sets the number above 6.5 ft. The headroom is for a person to stand and work in front of the gear without ducking under a beam, a duct, or a shelf.
A common point of relief: in some editions, equipment such as a panelboard sitting above other gear within the same dedicated footprint is handled by specific allowances, and small dwelling-unit equipment has its own treatment. Check the adopted edition for the exact carve-outs rather than assuming the headroom rule never bends.
Do not confuse this 6.5 ft of clear working headroom with the dedicated space above the gear, which is a separate rule with a different purpose. The headroom is room for the worker. The dedicated space is room reserved for the electrical system itself. They overlap on the floor plan but they answer different questions, and the next two sections keep them apart.
Dedicated equipment space above the gear, 110.26(E)
The dedicated equipment space is the volume directly above the footprint of the gear, reserved for the electrical installation and kept free of foreign systems. For indoor equipment, it runs from the floor up to a height of 6 ft above the equipment, or to the structural ceiling if that is lower. Inside that space, you keep out piping, ducts, and other systems that are not part of the electrical installation.
The reason is access and risk. Conductors and conduit have to be able to enter and leave the gear from above, and a leaking pipe or a sweating duct over a panel is a fault waiting to drip into it. So the code says the space above the equipment, up to that height, belongs to the electrical work. Sprinkler protection for the room is generally allowed, and a drip-protection apron can be required where systems pass above the dedicated space, but a sanitary line or an HVAC duct running through the dedicated zone is a violation.
Above that 6 ft (or above the ceiling), foreign systems can run, provided they do not create a condition that could damage the gear. The dedicated space is a column, not the whole room. Know where it ends so you can argue the point when the mechanical trade wants the ceiling space, and so you do not give away space the gear is owed.
What is the difference between dedicated and working space?
These are two separate requirements that people merge into one and then get wrong. The working space is in front of the gear and it is about the worker: depth, width, and headroom so a person can stand, work, and escape. The dedicated equipment space is above the gear and it is about the system: a reserved column over the footprint, kept clear of foreign piping and ducts so the electrical installation has room and is not put at risk from above.
Different location, different purpose, different rule. The working space can be used as a passageway and has to stay clear for work and exit. The dedicated space is not about a person standing there at all. It is about keeping a sprinkler main, a chilled-water line, or a grease duct from being routed over the panel.
Where it bites is in coordination. The mechanical and plumbing trades read the floor plan and see open space above the electrical room as theirs. It is not, up to the dedicated-space height. And the facility sees the open floor in front of the gear as storage, which it is not. Hold both lines, because losing either one is a separate violation.
Can you store things in front of an electrical panel?
No. The working space in front of electrical equipment has to stay clear and usable, and storing anything in it is a violation, not a gray area. Boxes, a ladder, a mop bucket, a stack of filters, shelving, a parked piece of equipment, all of it is prohibited in the space the code reserves for working on the gear. This is the single most common real-world failure of 110.26, by a wide margin.
It happens because the space looks like floor. The panel passed inspection, the room got turned over, and the facility filled the open square in front of the gear because it was the only open square in the room. Then an electrician shows up to work the panel hot and has to clear a storage rack first, in the dark, before they can even reach the deadfront.
You also cannot park other electrical equipment in the working space, and you cannot let one panel's required space be filled by a transformer or a second cabinet. The rule is plain: keep it clear, keep it usable, and keep it clear permanently, not just for the inspection. A photo of the clear space at turnover, and a painted or taped boundary on the floor, are cheap ways to keep it that way after the crew leaves.
Entrance and egress on large gear, 110.26(C)
Working space needs at least one entrance large enough to get in and out of. For large gear the code gets stricter, because a worker caught by an arc has to be able to leave from either direction. Where equipment is rated 1200 A or more and is over 6 ft wide and contains overcurrent, switching, or control devices, the working space generally needs an entrance at each end, so a person is never trapped at a dead end with the faulting gear between them and the only door.
The two-entrance rule has reductions. A single entrance can be acceptable if the working space depth is doubled and the entrance is positioned so a worker is never more than a set distance from it, or if there is a continuous, unobstructed exit path out of the space. Those reliefs are spelled out in the section, and the exact ampere threshold, width, and distances vary by edition, so check the adopted code.
The personnel doors that serve these spaces have their own rule. Where the gear is at or above the threshold the code sets, 800 A or more in recent editions and 1200 A in older ones, and the door is within a set distance of the working space, that door has to swing in the direction of egress and be equipped with listed panic hardware or fire-exit hardware. A worker on fire and backing away from an arc cannot stop to turn a knob and pull a door inward. Verify the threshold and distance against the adopted edition.
Illumination of the working space, 110.26(D)
Indoor working spaces about service equipment, switchboards, switchgear, panelboards, and motor control centers have to be illuminated. You cannot place that gear in a closet with no light and expect a worker to service it by flashlight held in their teeth. The code does not fix a specific light level for general cases, but it requires illumination, and it does not allow the lighting control to be only an automatic occupancy sensor that could leave a worker in the dark mid-task.
The practical reading: put a light fixture in the electrical room or over the gear, on a switch the worker controls, so the space is lit when someone is working the panel. It is a small line item that gets skipped in tight mechanical rooms and back corners, and it is an easy inspection catch.
Which equipment this applies to
Working space applies to equipment likely to be examined, adjusted, serviced, or maintained while energized. In practice that is most of the distribution system: panelboards and load centers, switchboards and switchgear, motor control centers, transfer switches, transformers with accessible energized parts, disconnects, and motor controllers. If a person will open it and work it live, it gets the clearance.
Panelboards are the most common case and the one most often crowded, since they end up in mechanical rooms, corridors, and closets where space is tight and other trades compete for it. The detail on selecting and installing the panel itself, the bus and main sizing, the AIC and fault rating, and the directory, sits in the companion panelboard installation guide. The hierarchy of switchgear, switchboards, panelboards, and motor control centers, and which gear belongs at which level, sits in the distribution equipment guide. This guide is the clearance those all share.
What usually does not require dedicated working space under this rule is equipment that is not worked on energized in normal practice, like a hardwired junction box or a sealed device. But the line is whether it is likely to be serviced live, so when in doubt, give it the space. An inspector would rather see clearance that turned out to be optional than gear jammed against a wall.
Outdoor pads, electrical rooms, and data centers
Outdoor equipment gets the same working space as indoor equipment of the same voltage and condition. A pad-mounted switch or an outdoor disconnect needs its depth, width, and height held clear, and the ground in front of it has to be a stable working surface, not a slope or a planting bed that nobody can stand on. The space being outside does not relax the dimension.
In a dedicated electrical room, the working space and the dedicated space frame the whole room layout. Lay out the lineups so their working spaces do not overlap, the aisles meet the depth for the condition, and the entrances satisfy the egress rule for the largest gear in the room. Crowding two lineups face to face turns the aisle into Condition 3 and drives the depth up, which is a layout decision that has to be made on the drawing, not discovered at rough-in.
Data centers stress the same rules harder, because the room is packed with power equipment and the pressure to fit more is constant. The working space in front of every PDU, switchboard, and panel still has to be clear and the dedicated space above still has to stay free of the cooling and piping that a dense room wants to run everywhere. The high equipment density is exactly the condition under which 110.26 gets squeezed, so it is the room where holding the line matters most.
Plan the clearance at design, not after the room fills
Working space is won or lost on the drawing, long before anyone pulls a wire. The clearance has to be coordinated at design, against the architectural walls, the structural columns, the mechanical ducts, the plumbing risers, and the door swings, because every one of those wants the same space the gear needs. Lay the gear out last and you will find the room already spoken for.
The failure pattern is familiar. The electrical room shows enough space on the single-line, but the mechanical drawings route a chilled-water main through the dedicated space above the switchboard, the architectural set swings a door into the working space, and the structural set drops a column three inches into the depth. Each trade drew its own sheet and nobody overlaid them. The conflict surfaces in the field, where moving the gear costs real money and moving the duct is somebody else's change order.
Catch it in coordination. Overlay the electrical working space and dedicated space on the composite model with the other trades, flag every encroachment, and resolve it on paper. A field coordination tool that lets you log the clearance as a checklist item per piece of gear, with a photo of the clear space at turnover, keeps the space from quietly filling between rough-in and the final. Use the layout phase to protect the room. It is the cheapest place to fix it.
What does the inspector check on working space?
The inspector checks the working space before the wiring, because if the space is wrong the gear has to move and the wiring is moot. They measure the depth in front against the table for the voltage and the condition, the width against the 30 in or the equipment, and the headroom against 6.5 ft or the equipment height. They look up at the dedicated space for any foreign pipe or duct in the column over the gear. On large equipment they check the entrances and the door swing and hardware.
Most of all they check that the space is clear and stays clear. A panel that measured fine at rough-in and now has a storage rack in front of it fails the final. So the smart move is to walk the gear with a tape before you call the inspection: measure your own depth, width, and height, sight the dedicated space, confirm the door opens 90 degrees and swings out where required, and clear anything that crept in.
Because working space is one of the most-cited items in the code, it is one of the first things a sharp inspector looks at, and one of the easiest to fail by neglect rather than ignorance. The gear was set right. The room got crowded. Catch it before the inspector does.
What to document
Record the clearance the way you would record any other code item, because the space is the part most likely to be lost after turnover and the record is what proves it was right when you left. Capture the measured depth, width, and height for each piece of gear, the voltage and the condition you sized the depth to, and a note that the dedicated space above is clear of foreign systems.
A photo of the clear working space at turnover is worth more than a checkbox, because it shows the space empty on the day the gear was accepted, before the facility filled it. The table below is the short version of what to log. Hedge every dimension to the adopted edition and Table 110.26(A)(1), since the exact numbers depend on the code the jurisdiction enforces.
| Dimension | Requirement | Note |
|---|---|---|
| Depth (front) | Per Table 110.26(A)(1) by voltage and condition; 3 ft minimum at 0 to 150 V | Verify against the adopted edition |
| Width | 30 in or the equipment width, whichever is greater | Need not be centered; door opens 90 degrees |
| Height (headroom) | 6.5 ft or the equipment height, whichever is greater | Clear floor to that height |
| Dedicated space (above) | Footprint up to 6 ft above the gear, or to the ceiling | No foreign piping or duct, per 110.26(E) |
| Entrance and egress | Per 110.26(C); large gear may need two | Door swing and panic hardware where required |
| Illumination | Working space illuminated, per 110.26(D) | Not on occupancy-sensor-only control |
Common mistakes
- Storing anything in the working space, the number-one real-world violation, after the room is turned over.
- Setting the gear too close to a wall to make the required depth for the voltage and condition.
- Calling a panel facing concrete, masonry, or grounded pipe Condition 1 when it is Condition 2.
- Running piping or duct through the dedicated equipment space above the gear.
- Leaving no second entrance or egress on large gear that the code says needs one.
- A personnel door that swings into the space, or no panic hardware where the gear rating requires it.
- Measuring depth from the wall or the back of the can instead of the face of the enclosure.
- Not coordinating the clearance at design, so other trades fill the room before the gear is set.
Field checklist
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Standards and references
The rules live in NEC 110.26, Spaces About Electrical Equipment, in NFPA 70. The depth in front comes from Table 110.26(A)(1), keyed to the voltage to ground and the condition. The width and height are in 110.26(A). The entrance and egress requirements for working space, including the two-entrance rule on large gear and the panic-hardware and door-swing requirements, are in 110.26(C). The dedicated equipment space above the gear is in 110.26(E), and the illumination requirement is in 110.26(D).
The 3 ft minimum depth, the 30 in width, the 6.5 ft height, the 6 ft dedicated space, the Condition 1, 2, and 3 definitions, and the ampere thresholds for two entrances and for panic hardware have all been adjusted across code cycles. Confirm every one of them against the edition the jurisdiction has adopted and any local amendments before you cite a number on a submittal or set the gear. The AHJ is the final word on which edition applies and how it reads it.
NFPA 70E, the standard for electrical safety in the workplace, is the companion on the safety side: it governs how a worker is allowed to interact with energized gear, the arc-flash boundary, and the personal protective equipment, which is the human half of the reason the working space exists. Cite 110.26 for the installed clearance and 70E for the work practice. The two reinforce each other, and the working space is where they meet.
Units and terms
The same clearance shows up in both unit systems, since the NEC carries metric and inch-pound values side by side, and the rounded inch-pound figures are what most crews work to.
The depth minimum of 3 ft is 900 mm in the metric column. The 30 in width is 762 mm. The 6.5 ft height is 2.0 m, written as 6 ft 6 in. The dedicated-space height of 6 ft is 1.8 m. Voltage to ground, not phase-to-phase voltage, is what selects the row in Table 110.26(A)(1), which trips people on three-phase systems where the two numbers differ.
- Working space
- The clear depth, width, and height the code reserves in front of gear worked on energized, for access and escape
- Dedicated equipment space
- The reserved volume above the gear footprint, kept free of foreign piping and duct, per 110.26(E)
- Condition 1 / 2 / 3
- How the depth is set by what is across the space: nothing grounded, a grounded surface, or live parts on both sides
- Voltage to ground
- The voltage between a conductor and ground, the value that selects the depth row, not phase-to-phase voltage
- Egress
- The path and door out of the working space, with two entrances and panic hardware required on large gear
- AHJ
- Authority having jurisdiction, the inspector or office that adopts the code edition and makes the final call
FAQ
What is NEC 110.26 working space?
NEC 110.26 working space is the clear area required in front of electrical equipment likely to be worked on energized, so a person can stand, work, and escape an arc without contacting live parts. It sets a depth, width, height, entrance, illumination, and a dedicated space above. The adopted edition controls the dimensions.
How much clearance does an electrical panel need?
A common 120/240 V or 120/208 V panel needs at least 3 ft of clear depth in front, 30 in of width or the panel width if wider, and 6.5 ft of headroom. The depth grows with higher voltage and worse condition per Table 110.26(A)(1). Verify against the adopted code edition.
Can you store things in front of an electrical panel?
No. The working space in front of a panel must stay clear and usable, and storing boxes, ladders, mop buckets, or equipment in it violates NEC 110.26. It is the most common real-world failure of the rule. The space exists so a worker can reach the gear and escape an arc, so keep it permanently clear.
What is the difference between dedicated and working space?
Working space is in front of the gear and is for the worker: depth, width, and headroom to work and escape. Dedicated equipment space is above the gear and is for the system: a reserved column up to 6 ft or the ceiling, kept free of foreign piping and duct. Two separate rules, different location and purpose.
What are Condition 1, 2, and 3 in Table 110.26(A)(1)?
The condition describes what is across the working space. Condition 1 is nothing grounded opposite, or guarded live parts. Condition 2 is a grounded surface opposite, such as concrete, masonry, or pipe. Condition 3 is live parts on both sides. The depth increases from 1 to 3 because more ground paths mean more room is needed to escape.
Does an electrical panel door need to swing out?
On large gear it can. Where equipment is at the ampere threshold the code sets, 800 A or more in recent editions, and the personnel door is within a set distance of the working space, the door must swing in the direction of egress and have listed panic hardware. Confirm the threshold and distance against the adopted NEC edition.
Can a pipe run above an electrical panel?
Not within the dedicated equipment space. NEC 110.26(E) reserves the column above the gear footprint, up to 6 ft above the equipment or to the ceiling, and foreign piping and duct are not allowed in it. Above that height they can run if they do not put the gear at risk. Sprinkler protection for the room is generally allowed.
When does electrical equipment need two exits?
Under NEC 110.26(C), large gear, commonly rated 1200 A or more and over 6 ft wide with overcurrent or switching devices, generally needs an entrance at each end of the working space. A single entrance can work if the depth is doubled or an unobstructed exit path exists. Verify the threshold and reliefs against the adopted edition.
Is working space measured from the wall or the panel?
From the panel. The depth is measured from the live parts, or from the face of the enclosure or opening if the live parts are inside a cabinet, out into the room. It is not measured from the wall behind the gear or the back of the can. The full depth stays clear floor to ceiling height.
People also ask
Codes cited in this guide
This guide is written and reviewed against the published standards below. Always confirm the current adopted edition with the authority having jurisdiction.