Centrally Supplied (Emergency Lighting) System

What is a Centrally Supplied System?

An emergency lighting system in which a number of exit signs, or emergency luminaires, or both, are supplied from a common power source.

Centrally supplied luminaires are a light source with its emergency power source and associated charging and control equipment located in a remote room or enclosure. The emergency power source may be located in a room with battery systems associated with building monitoring, fire safety or evacuation systems.

A central battery system differs from the conventional SPU (single point unit) fittings in that the battery to power the fitting in emergency mode is physically removed from the fitting itself.

What types of Centrally Supplied Systems are available?

Central battery systems are custom designed with common configurations. Whilst 110VDC is the most common voltage used in central battery systems, many other variants have been created using other voltages such as 24 or 36VDC. For new installations, 240VAC is often the more desirable solution.


Dual Supply

240VAC mains running maintained fittings with the central battery system supplying the backup emergency power

  • The 110VDC supply from the central battery system could be either maintained or non-maintained.

110VDC Slave

A fitting (slave) is powered solely by the central battery system

  • Maintained – The 110VDC supply from the central battery system is always ‘live’, resulting in slave fittings being maintained.
  • Non-maintained – The 110VDC supply from the central battery system is only powered on loss of mains, slave fittings are non-maintained.

Contact BARDIC for a tailored solution.