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Electrical Equipment Working Clearance Space Calculator

Calculate the required clear floor space in front of electrical equipment per NEC 110.26 working clearance rules.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax
1.97 ft
Schematic, drawn to the proportions you entered — not to scale on screen.

Required minimum working clearance area

7.27 ft²

Check your inputs

Required depth depends on the equipment's nominal voltage-to-ground and the installation condition (0/1/2, based on what's opposite the equipment) per NEC Table 110.26(A)(1) — look up the correct depth for your specific installation rather than assuming a default. Height clearance (2.0m/6.5ft minimum) is a separate NEC 110.26(E) requirement not covered by this floor-area calculation.

Clear width used
29.53 in

At the values currently entered, the required minimum working clearance area works out to 0.68 m². Confidence is moderate: the method is sound, but real materials and site conditions vary. Figures are shown for United States, where IRC 2024 is the governing residential reference; switch the market above if you are building elsewhere.

Estimated cost — your price

This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • NEC 110.26(A) requires a minimum clear working space in front of electrical equipment, with depth determined by voltage-to-ground and condition (typically 900mm/3ft, 1050mm/3.5ft, or 1200mm/4ft), and width the greater of the equipment width or 750mm/2.5ft

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Frequently asked questions

Why is the clear width sometimes larger than the equipment itself?
NEC 110.26(A) sets the required working space width as the greater of the equipment's own width or 750mm (2.5ft). For equipment narrower than 750mm, the code still requires the full 750mm of clear width in front of it.
How do I know which required depth to use?
The required depth (900mm/3ft, 1050mm/3.5ft, or 1200mm/4ft) depends on the equipment's nominal voltage-to-ground and the installation condition (0, 1, or 2, based on what's opposite the equipment) per NEC Table 110.26(A)(1) — this calculator does not look that value up for you, so enter the depth that applies to your specific installation.
Does this calculator cover the required height clearance too?
No — this only calculates the required clear floor area (width × depth) in front of the equipment. NEC 110.26(E) separately requires a minimum headroom clearance of 2.0m (6.5ft) above the working space, which is not part of this floor-area calculation.