NEC Article 110 — Working Space, Identification, and the General Rules NJ Inspectors Cite Most

NEC Article 110 is the foundation — the general rules that apply to every electrical install regardless of equipment type. NJ inspectors cite Article 110 more than any other on residential rough-in failures.

Working space (110.26(A)): every panel, disconnect, and motor controller needs at least:

• 30 inches of width, centered on the equipment
• 36 inches of depth in front (live parts to any obstruction)
• 6.5 ft of vertical headroom

The depth rule is the killer in Hudson County renovations — basement panels often end up behind a workbench or near plumbing, both of which fail. Shelving and cabinetry must be removable or out of the 36-inch zone.

Dedicated equipment space (110.26(E)): the space DIRECTLY ABOVE a panel up to the structural ceiling (or 6 ft above the panel, whichever is less) must be clear of foreign systems — no plumbing, no ductwork, no unrelated equipment. Sprinklers above are allowed if they're 6 ft+ above the panel.

Identification (110.22): every disconnect must be permanently marked to identify what it controls. Sharpie on the door isn't permanent — the AHJ wants engraved or labeled with a label-maker. "Main," "Range," "EV Charger," etc.

Arc-flash labeling (110.16): service equipment and panelboards rated 1,000 V or less in non-dwelling occupancies must carry an arc-flash warning label. Pure residential is generally exempt, but mixed-use buildings (Hoboken brownstones with a ground-floor commercial space, for example) need them on any panel serving the commercial portion.

Conductors for high-leg systems (110.15): in 240 V delta systems with a high-leg (rare in residential, more common in older NJ commercial), the high leg is identified with orange. Not relevant to most single-phase residential service work.

For real install, verify every working-space dimension with a tape measure before you set the can — it's the most common rough-in failure point in Hudson and Essex County.