Join Date: Dec 2001
Location: Belleville, Illinois
Thanked 22 Times in 17 Posts
Yeah, for a residential gate operator to meet UL standards it has to keep track of its problems. If it bumps into something as it closes it has to reverse to open, and can apply no more than some small force on the object it hits. After some period of time it can try again. If it again bumps into something it has to reverse to open and then shut itself down until a reset button is pressed on the operator. And it has to have at least two methods of determining that it has bumped into something. The operators I sell use a bump strip on the ends of the gate and a pressure switch in the hydraulic circuit, and some installations also use one or more photo eyes.
The rules are the same if it bumps into something when opening, except that it has to reverse itself for two feet and then stop. I might be off on the details, since it's been several years since I went through a class on that, but they're at least that complicated. That's to receive a UL listing, but if someone gets hurt by a homemade operator that isn't up to those standards there's going to be a mess of lawyers involved.