Is there a way to limit the horizontal angle of a motion based indoor (occupancy) light switch to it doesn't pick up movement within, say 90 degree horizontal angle only
Motion Sensor Light Switch – How to Limit Detection Angle
lightswitch
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This type of switch requires a small amount of power to operate, and since there is not always a return path available for constant power. This switch uses the grounding conductor as a current carrying conductor, and dumps a small amount of power to the grounding conductor. It's not the best design; in my opinion, but if the standards and safety organizations approve it it must be safe.
Because of this awful design, a solid connection to earth is required for this switch to function. Which in your case, seems to be missing. It sounds like there is a grounding conductor included in the cable assembly at the switch box, so I'd start by tracing the cable back to where it originates. Follow the cable back to the nearest junction, whether that be another device or the service panel. Open up the junction point, and inspect the wiring. If everything looks good at that point, continue back down the line until you reach the service panel. You can use a tool like this Multi-Purpose Wire Tracer, to help trace the line through walls and ceilings.
If you reach the service panel, and all the connections along the way looked good. It means you likely have a break or some other damage to the grounding conductor inside the cable assembly. If this is the case, you'll have to locate the damaged section and replace it.
Depending on the device you're installing, the installation can be a bit different. Consult the installation guide that came with the device, to determine the proper wiring.
I've randomly selected installation guides from a couple available devices, and I'll show the differences. Keep in mind that your device may vary, and you should consult the documentation with your device.
Lutron
The Lutron installation guide, shows this wiring diagram.
Which seems very straight forward.
- Connect the Black (common) wire to the Black (common) wire from the device.
- Connect the Red (traveler) wire to the Blue (traveler) wire from the device.
- Connect the White (traveler) wire to the Black (traveler) wire from the device.
Leviton
The Leviton Installation Guide, shows a bit more complicated diagram.
They even provide a troubleshooting section, to help you get the thing working correctly.
NOTE:
This is just a small sample of the available devices, consult the documentation that came with the specific device you are trying to install for proper installation instructions.
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Best Answer
I did the same thing for a motion sensor in my alarm system. A window in the corner of the view was causing false alarms.
I am assuming that your sensor is similar, it has a semicircular translucent cover over the IR sensor. I disassembled mine and put black electrical tape on the back side of the translucent cover to block part of the view.
You could also put tape on the front, but it won't look as nice.