LARGE SYSTEM (CENTRALLY SUPPLIED SYSTEMS)
In large systems, loss of supply on a sensing circuit connected to the normal fittings will automatically energize emergency luminaires and exit signs in the area served by the normal lighting subcircuit. Figure 1, shows how multiple Emergency Test Switches are wired to sense multiple normal fitting subcircuits in a large system. On a large system the manual test facility only tests the emergency fittings on the unit the devices are connected to and not on the interlinking units.
FIGURE 1: Wiring diagram for sensing and control of a large emergency lighting system.
SMALL SYSTEM (SINGLE-POINT SYSTEMS)
In small systems, the self-contained emergency luminaires and exit signs are configured in such a way that if the power fails on the normal lighting subcircuit, the emergency devices will be powered by the emergency power source. Figure 2 shows how the Emergency Test Switch is wired in a small point system. There are no monitored inputs on a small system and the loss of power will automatically make the emergency fittings switch into emergency mode.
NOTE: As the emergency circuit is connected to the same protective device as the normal light fitting, no sensing is required, as if the protective device is triggered the emergency lighting will turn on.
FIGURE 2: Self-contained emergency luminaire with a manual test facility in the monitored supply (typical single lighting circuit buildings).
The Emergency Test Switch uses a 1DIN size contactor (NOT provided). Recommended contactors to be used with the product include CLIPSAL 4CNT1/1NC or HAGER ESC227.
FIGURE 3: Wiring diagram of the Emergency Test Switch Assembly.
WIRING AND INTERLINKING
Multiple Emergency Test Switches can be interlinked so that multiple emergency systems can be triggered at the same time when one or more lighting circuits fail. Up to 6x units can be connected together, allowing up to 30 mains circuits to be monitored. The units being interlinked need to have a common neutral connection as shown in the figure below. The EM-TIMER-INTERLINK Cable (6122) shall be used to interlink the units.
NOTE: The interlink cable is only used to trigger an emergency condition. The setting of prolong and relay mode will need to be set on each Emergency Test Switch.
FIGURE 4: Emergency Test Switch connecting diagram.