Final answer:
The Federal law in the U.S. stipulates that residential garage door openers produced after January 1, 1993, must have a safety feature like photo-electric eyes to auto-reverse the door if an obstruction is detected.
Step-by-step explanation:
Federal law in the U.S. mandates that all residential garage door openers manufactured after January 1, 1993, must be equipped with photo-electric eyes or some other auto-reverse safety feature. This requirement was implemented to improve consumer safety by preventing injuries from garage doors closing on individuals or property.
The photo-electric sensors are typically installed near the bottom of the garage door and create an invisible beam across the door's path. If the beam is interrupted while the door is closing, the door will automatically reverse direction to prevent potential harm.
Federal law in the U.S. requires that residential garage door openers manufactured after a certain date must be equipped with photo-electric eyes or some other auto-reverse safety feature.
The specific date is January 1, 1993. This requirement was put in place to enhance the safety of garage door operation and reduce the risk of accidents or injuries.