NEC 110.26 Working Space Lookup
NEC 110.26 is the field checkpoint for access and working space around electrical equipment. Use this page to separate physical clearance review from load calculation, breaker sizing, wire sizing, ampacity, voltage drop, and raceway fill results.
| Field Item | NEC Reference | Field Meaning |
|---|---|---|
| General access | NEC 110.26 | Electrical equipment must have access and working space so it can be operated and maintained safely. |
| Likely energized work | NEC 110.26(A) | Equipment that may need examination, adjustment, service, or maintenance while energized needs clear working space and may also need NEC 110.16 Arc-Flash Hazard Marking review. |
| Depth of working space | NEC 110.26(A)(1) | Depth depends on voltage and surrounding conditions. Do not treat every installation as the same clearance case. |
| Width of working space | NEC 110.26(A)(2) | Working width is checked against the equipment width and the minimum required working width. Doors or hinged panels must be able to open. |
| Height of working space | NEC 110.26(A)(3) | Headroom and equipment height must be reviewed so the worker is not forced into an unsafe work position. |
| Clear space | NEC 110.26(B) | Required working space must stay clear. It should not become storage space for boxes, appliances, tools, or materials. |
| Entrance and egress | NEC 110.26(C) | The worker must have a way to enter and leave the working space. Large equipment may trigger additional egress review, especially where service equipment and larger overcurrent devices also require safety-boundary checks such as NEC 240.87 Arc Energy Reduction. |
| Dedicated equipment space | NEC 110.26(E) | Panelboards, switchboards, switchgear, and motor-control centers need dedicated equipment space protected from foreign systems, damage, and field conditions that may also require durable NEC 110.21(B) Field-Applied Hazard Markings. |
| Calculator boundary | TradeHub scope | TradeHub calculators can flag clearance review, but they do not measure rooms, verify access, approve egress, or override the AHJ. |
Safety Boundary
Working Space Safety Boundary
NEC 110.26 is not a math output from a calculator. It is a field condition that must be checked at the actual equipment location.
A panel can have a correct load calculation, correct breaker size, correct conductor size, and still fail the job condition if the working space is blocked, too narrow, too shallow, too low, or trapped behind storage or building equipment.
Field Translation
Do not trust the electrical result until the worker can safely stand, open the equipment, enter the space, and leave the space. A calculator result cannot confirm safe access or clear working room.
Clearance Review
Clearance Checks
Use these checks before treating a panel, service disconnect, switchgear lineup, EV charger disconnect, or HVAC equipment disconnect as serviceable in the field.
Depth: Confirm the front working depth based on equipment voltage and surrounding surfaces.
Width: Confirm the working width and make sure covers or hinged doors can open as needed.
Height: Check overhead obstructions, platforms, pads, ducts, piping, framing, and equipment height.
Clear access: Remove storage, furniture, shelving, appliances, job materials, and anything blocking safe access.
Access and Dedicated Space
Access and Dedicated Space
Access and egress: The worker must be able to get to the working space and leave the working space. Large equipment, service equipment, and tight electrical rooms need careful review before assuming one doorway or pathway is enough.
Dedicated equipment space: Do not allow unrelated piping, ductwork, storage, or building systems to crowd the required electrical equipment space where the NEC requires a dedicated zone.
Equipment-specific service access: HVAC equipment, disconnects, and service areas may also need separate field checks such as NEC 210.63 HVAC Equipment Receptacle review when the installation involves heating, air-conditioning, or refrigeration equipment.
Calculator Use
TradeHub Calculator Application
TradeHub calculators can help size or screen electrical work, but NEC 110.26 working space remains a physical clearance and access checkpoint before equipment placement is trusted.
Related TradeHub Calculators
Field Checks
Common Field Misses
Storage in front of panels: boxes, tools, appliances, shelves, or job materials occupy the required work zone.
Door swing blocked: equipment covers or hinged panels cannot open enough for safe work.
Tight equipment rooms: transformer pads, switchgear, walls, doors, and raceways reduce the working area.
Foreign systems overhead: piping, ducts, and non-electrical equipment enter dedicated space where they should not.
Large equipment egress: high-ampacity lineups may need more than a casual doorway check.
Outdoor equipment crowding: landscaping, walls, fences, bollards, or mechanical equipment reduce service access.
Related References
Related NEC Field References
Review durable warning-label requirements that often support working-space and equipment-safety communication.
NEC 110.16 Arc-Flash Hazard MarkingUse with working-space review when equipment may be serviced or maintained while energized.
NEC 240.87 Arc Energy ReductionConnects large overcurrent equipment review to arc-energy reduction and qualified-person safety checks.
NEC 210.63 HVAC Equipment ReceptacleUseful when reviewing service access, equipment location, and required receptacle placement around HVAC equipment.
Source Scope
Source Alignment and Use Scope
This TradeHub resource is a field reference based on NEC 110.26 working-space requirements and related TradeHub source alignment records. Review the TradeHub Code Citation & Source Log for source alignment records and the TradeHub Methodology page for how field references are scoped.
It supports screening and planning only. It does not reproduce proprietary NEC tables, approve physical installations, verify room geometry, confirm door swing, replace site measurement, or override adopted local code, plan review, employer safety policy, or AHJ interpretation.
Common Questions
Working Space FAQ
What is NEC 110.26 working space for?
NEC 110.26 provides access and working-space requirements around electrical equipment so operation and maintenance can be performed safely. It is a field clearance and access rule, not a load or conductor-sizing calculation.
Can storage be placed in front of an electrical panel if the panel is rarely used?
No. Required working space must be kept clear and should not be used for storage, even if the equipment is not serviced often.
Does TradeHub verify NEC 110.26 clearance dimensions?
No. TradeHub calculators can flag working-space review as a field condition, but they do not measure rooms, approve access or egress, verify dedicated equipment space, or replace inspection by the authority having jurisdiction.