NEMA Cabinets

NEMA TS1 cabinets use a hardwired connector interface between the controller and cabinet, while TS2 cabinets use a serial communications bus (either TS2-1 or TS2-2), reducing wiring complexity and enabling advanced diagnostics. TS2 is the newer, more widely adopted standard for modern intersection control equipment.

Most NEMA traffic cabinets are constructed from weatherproof 5052-H32 aluminum or 0.125-inch thick aluminum, chosen for its corrosion resistance, durability, and lightweight properties. This construction protects internal electronics from moisture, dust, and temperature extremes in outdoor roadside environments.

NEMA cabinets themselves do not include battery backup by default, but they are commonly paired with separate Battery Backup Systems (BBS) or UPS enclosures, such as Type 3R rated units, that maintain intersection power during outages, sags, and brownouts, ensuring continuous traffic signal operation.

NEMA cabinets are available with single or double door configurations, and some models offer a special access police door for restricted maintenance access. Door openings typically cover up to 80 percent of the front surface to allow easy access to internal components.

Yes, many NEMA-based cabinets are designed to also meet Caltrans specifications and the ATC 5301 Advanced Transportation Controller Cabinet Standard. This allows agencies to select cabinets that satisfy multiple regulatory requirements, simplifying procurement across different state and municipal DOT projects.

Depending on the model and configuration, NEMA cabinets can support up to 16 movement phases, 64 detection channels, and in advanced ATC-compatible designs, up to 32 signal outputs and 120 detection inputs, accommodating complex, high-traffic intersection configurations.