Lighting Control Relays
A lighting system designer generally has a choice of using individual lamp controls or a lighting control relay. In some cases, self-controlled luminaries are a good option. However, when the lighting system exceeds five or six separate lights, or when coordinated coverage of a larger area is required, a lighting relay should be considered. Relay panels offer several unique advantages:
- They allow a single point of maintenance for the photocell
- The main circuits are energized only when needed
- Lightning protection can be provided for both line and control circuits
- The relay serves as a safety disconnect and isolation point should circuit service be required;
- Relays provide coordinated switching of multiple lighting elements
- They allow a single control point for operation
Trinetics offers an extensive line of lighting relay panels, commonly referred to as RCOC (Remote Control of Outdoor Circuits) relays. The lighting controls are available with contact types as follows:
- Air contacts
- Sealed contacts
Lighting Relay Applications
Lighting control relays are used to control outdoor area lighting for parking lots, athletic fields, street lighting projects, DOT projects, or any application where coordinated lighting of a large area is required. Rather than using individual photocells to control each individual lighting point, lighting control relays provide a centralized single control point for all of the lights in the circuit.
Outdoor lighting relays have four main components to consider when choosing a control for a given application, which are the control, the contactor, the over-current protection for the lighting circuit, and the case. The controls vary in design and complexity and range from photocell and timer controls, to microprocessor and panel board controllers. The switching medium ranges from air-break contactors, to sealed mercury tube contactors, to solid state thyristor controlled circuits. Outdoor control cases are constructed from a range of materials including heavy duty Bakelite cases, resilient UV stable polymer cases, die cast aluminum and multiple other metal case options.