I'm currently doing multiple aircraft hangars that have everything below 18" as class 1 area. Each hangar has a bifold door that has a receiver and transmitter just like most common garage door systems. They each are fed with SO cord and terminate above in Controller that isn't in class 1 zone. Since the operating voltage is 24V does cords have to be run in raceway? The transmitter and receiver are both sealed units. They are both shown mounted to floor.