What voltage do load switches in traffic signal cabinets receive?

Answer: B — 24V DC

Load switches in traffic signal cabinets typically receive 24V DC voltage. This is primarily due to the standardized power supply systems used in traffic signal control. The 24V DC supply is common because it is reliable, safe, and effective for the operation of various low-voltage devices and systems within the traffic signal infrastructure. The use of 24V DC helps to ensure operational consistency and reduces the risk of electrical hazards. Additionally, this voltage level is less likely to cause severe harm if an accidental contact occurs, making it a preferred choice for public applications like traffic signals. Furthermore, the infrastructure designed around traffic signals often incorporates other components that operate effectively with a 24V DC supply, such as LED signal heads and controllers, ensuring uniformity and compatibility across the traffic signal system.