Electrical Service & Specialty Cabinets — service pedestals and custom enclosures

Traffic signal cabinets are typically rectangular, base-mounted aluminum enclosures (often 0.125" or 5052-H32 aluminum) standing several feet tall with one or more lockable doors, ventilation louvers, and mounting for an EIA 19-inch equipment rack. Exteriors are commonly gray or beige, with labeling and special police-access panels depending on the model.

Traffic signal wiring connects the controller, load switches, detector inputs, and signal heads through termination panels inside the cabinet, following NEMA TS1/TS2 or ATC wiring diagrams. Because this involves high-voltage AC and safety-critical timing, wiring should be performed by licensed electricians or certified technicians following manufacturer schematics and DOT specifications.

NEMA cabinets follow National Electrical Manufacturers Association TS1/TS2 standards using traditional parallel wiring, while ATC (Advanced Transportation Controller) cabinets use high-speed serial communications for simplified wiring, smaller footprints, and advanced diagnostics, supporting up to 32 signal outputs and 120 detection inputs.

A traffic UPS enclosure houses battery backup modules, transfer switches, and battery management systems in a rugged Type 3R aluminum cabinet, automatically switching intersections to battery power during outages, sags, or brownouts to prevent signal downtime and reduce costly emergency service calls.

Yes. Enclosures can be configured with different door counts, mounting styles (pole, pad, or base), materials, ventilation, locking hardware, and rack layouts to match specific utility, ITS, or agency requirements, including hybrid designs that transition legacy cabinets to modern serial-based technology.

Look for cabinets that are UL 508 approved, ISO quality-assured, and compliant with Caltrans, NEMA TS1/TS2, or ATC 5301 standards depending on your jurisdiction. These certifications confirm the enclosure has been tested for electrical safety, weatherproofing, and interoperability with standardized traffic control equipment.