Glossary of Terms

2-wire switch

These products don't require a neutral connection.


3-wire switch

These products require a neutral connection.


Absence detection

Requires a user to manually switch lights on. Occupancy sensors switch lights off when the room is empty.
See also: Presence and Absence Detection Explained.


BMS (building management system)

A system that controls and monitors a building's mechanical and electrical equipment.


HVAC

Heating, Ventilation & Air Conditioning.


IP Ratings

IP40: Protected from tools and small wires greater than 1mm. Not protected from liquids.
IP54: Protected from limited dust ingress. Protected from water spray from any direction.
IP55: Protected from limited dust ingress. Protected from low pressure water jets from any direction.
IP65: Protected from total dust ingress. Protected from low pressure water jets from any direction.
IP66: Protected from total dust ingress. Protected from high pressure water jets from any direction.


Motion detector

A motion detector is a device that detects moving objects, particularly people. Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area. They form a vital component of security, automated lighting control, home control, energy efficiency, and other useful systems. Motion detectors are also known as presence detectors.

Wikipedia


Lux level sensing

Lux level sensing detectors only turn lights on when natural light falls below a pre-set level.
See also: Switching Detectors with Lux Level Sensing and Direct Dimming Detectors with Lux Level Sensing.


Neon (permanent)

A permanent neon allows a switch to be easily located in the dark.


Neon (temporary)

A temporary neon indicator shows when the timer is running.


Occupancy sensor

An occupancy sensor is an indoor motion detecting devices used to detect the presence of a person to automatically control lights or temperature or ventilation systems. The sensors use infrared, ultrasonic, microwave, or other technology. The term encompasses devices as different as PIR sensors, hotel room keycard locks and smart meters. Occupancy sensors are typically used to save energy, provide automatic control, and comply with building codes. Occupancy sensors are also known as presence detectors.

Wikipedia


Passive infrared sensor

A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors.

Wikipedia


PIR presence detectors

PIR presence detectors work by detecting the movement of body heat.
See also: Presence and Absence Detection Explained.


Slave switch (timers)

Slave push button switches allow one timer to be controlled from a number of locations. Also known as a bell switch.


SELV module (safety extra low voltage)

Removes the need for mains voltage switch wires and RCD to comply with IEE 17th Edition regulations.


Timeout

The period of time set on a sensor that holds lights on after the last movement is detected.


User remote control

Pre-program light levels to recall at anytime or use simply to operate lights on/off.


Volt free contacts

The output channel comprises a mains voltage relay capable of on/off switching. The unit provides an isolated voltage free contact output.