St. Clair County, IL Building Safety: Electrical Permits (2026)

St. Clair County adopted the National Electrical Code, 2011 edition, published by the National Fire Protection Association, as the Electrical Code of St. Clair County under Ordinance No. 06-868 (June 27, 2005), covering the design, construction, installation and maintenance of electrical systems and equipment countywide (Sec. 7-7-1). Before any electrical work begins on a structure regulated by the code, the owner or an authorized agent must apply to the Building Official and obtain a permit; that permit requirement (IBC Sec. 105.1, adopted as County Building Regulations Sec. 7-1-27) covers building, gas, mechanical and plumbing work performed alongside electrical work. Contractors who alter or maintain already-approved systems can apply for an annual permit instead of one permit per job, but must keep detailed alteration records the Building Official can inspect at any time.

The county layered several local amendments onto the 2011 NEC (Sec. 7-7-13, adopted by Ord. No. 10-1029, September 27, 2010). Every dwelling service panel needs a single main disconnect, three spare breaker spaces on new construction, and no half-size breakers; the minimum service size countywide is 100 amps, and aluminum conductors must carry at least 100 amps of ampacity. Ground wire from the meter socket to the ground rod must run in PVC conduit, and accessory structures other than dwellings need conduit-protected wiring approved by the County Electrical Inspector. Bedroom circuits require arc-fault circuit-interrupter protection.

An Electrical Inspector, appointed by the County Board Chairman with the Board's consent, administers the program under the Building and Zoning Department and must hold at least five years as a journeyman electrician or three years of electrical-engineering training plus two years of field experience. The Electrical Board of Appeals hears disputes over the inspector's rulings.