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Common NEC Violations on Electrical Drawings

Helonic is an AI construction drawing analysis platform for teams researching code compliance during drawing review.

The NEC misses on electrical sheets: working clearance, GFCI and AFCI, disconnects, and panel schedules that disagree with the plan.

Code ComplianceSeptember 24, 2026

The NEC violations that show up on electrical drawings are working clearance in front of panels, missing GFCI or AFCI where the occupancy requires it, disconnects that are not within sight of the equipment, and panel schedules that do not match the plan. Helonic flags those on the PDF so the reviewer is not hunting article numbers from memory.

Which NEC rules fail on the sheets?

Most of these are visible without opening the codebook if you know where to look. The plan either shows the clearance or it shows a door, duct, or column in that zone.

  • NEC 110.26 working space blocked by a door swing, column, or duct.
  • NEC 210.8 GFCI missing in kitchens, bathrooms, rooftops, and outdoors.
  • NEC 210.12 AFCI missing on dwelling-unit branch circuits the code requires.
  • NEC 430.102 disconnect not within sight of the motor.
  • A panel schedule circuit that the floor plan never shows.

How do you check them without rereading the code?

Start at each panel and walk the clearance box on the plan. Then sample the wet and dwelling locations for GFCI and AFCI notes. Then match the ten largest loads on the schedule to equipment on the plan.

Helonic runs that comparison across the electrical set and marks the sheet where the clearance or the circuit breaks.

Frequently Asked Questions

What are common NEC violations on construction drawings?
Blocked panel working space, missing GFCI or AFCI, disconnects that are not within sight, and panel schedules that do not match the plan. These are drawing problems, not just field problems.
How much working clearance does a panel need?
NEC 110.26 requires a clear working space in front of the equipment. Depth depends on voltage and what is across from the panel. A door swing into that box is a common miss on the plan.
Where do drawings miss GFCI protection?
Kitchens, bathrooms, rooftop receptacles, and outdoor outlets under NEC 210.8. The plan shows a receptacle symbol and no GFCI note, or the panel schedule omits the GFCI breaker.
Does an electrical checklist replace an NEC review?
The checklist is the order of sheets. This list is the code failures to look for on those sheets. Use both. The checklist link is the procedure, and this page is the violation set.
MG

Manas Gandhi

Co-founder & CTO, Helonic

Manas is the co-founder and CTO of Helonic, where he leads engineering and AI research for construction drawing analysis. He works directly with structural, MEP, civil, and fire protection engineers to translate the way they review drawings into AI systems that flag the issues that actually matter in the field. Before Helonic, he built machine learning pipelines for technical document understanding and has spent the last several years interviewing licensed design engineers and discipline leads to ground product decisions in real practice rather than industry assumptions.

Areas of focus
  • AI for technical document understanding
  • Cross-discipline coordination workflows
  • Code compliance automation (IBC, NEC, NFPA, IPC, IMC, ASCE)
  • Structural and MEP drawing review systems

How this page was researched: Violation examples were checked against NEC 110.26 working space, 210.8 GFCI, 210.12 AFCI, and 430.102 disconnect location. The review sequence matches the conflicts Helonic flags on electrical plans and panel schedules.

Last reviewed by Manas Gandhi · September 24, 2026

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