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System selection
www.emergi-lite.co.ukEMEX Power
| System selection
Choosing the right system
Design of centrally-powered emergency lighting systems is a complex process. For each system, it is imperative that
sufficient battery power is made available to operate all emergency luminaires in the event of a mains failure.
Selecting a sufficiently powerful system at the outset is key to avoiding increased costs or revised installation
requirements at a later point in the project.
Emergi-Lite’s Central Power Supply Department has substantial experience of designing Central Power Supply
Systems and of providing technical advice on all aspects of centrally-powered emergency lighting schemes. Our team
of engineers provides comprehensive support to parties involved in scheme design and is available to assess your
specific requirements and prepare a relevant quotation as required.
To discuss your requirements in detail please contact our Central Power Supply Department on +44 (0)113 281 0600.
To assist our engineers, consideration should be given to the following to help specify the level of CPS required.
Luminaire specification
To determine the size of CPS required, our engineers
will need the following information about the
luminaires intended for the emergency lighting
scheme:
l
Luminaire type & manufacturer (including
luminaire part numbers if available)
l
Quantity of luminaires in the scheme (per type)
l
Luminaire wattage for each luminaire type – note:
particular attention should be given to
low wattage luminaires not operating to unity
power factor
Central power unit specification
Emergi-Lite EMEX Central Power Supply Systems are dual rated to allow selection of an appropriate system to either
commercial or ICEL ratings. First consideration in system selection should therefore be to decide the preferred rating
for the CPS – ICEL or commercial.
ICEL rated systems are de-rated by 20% from their commercial equivalent system. In effect, these systems include
20% spare capacity to provide the system designer/installer opportunity to incorporate additional luminaires into the
emergency lighting scheme at a later date, without compromising the power supply.
Second consideration is to determine the size of central power unit required. From the luminaire data supplied,
Emergi-Lite’s CPS department can advise the most appropriate size of CPS unit from our standard range of static
inverters displayed on page 14. Note, higher rated systems require multiple cabinets to be installed and therefore
consideration should be given to the space these cabinets will require. Calculation of space requirements is
straightforward as Emergi-Lite only supply one standard size of cabinet – as shown below.
Finally, consider the additional components required. Emergi-Lite offers two types of standard unit, EMEX Power or
EMEX TS, as shown on page 13, plus a range of EMEX Test components on pages 21 & 22 for enhanced management
and monitoring of the CPS.
Cabinet size
Standard cabinet size is 750mm wide x 650mm deep
x 1800mm tall. For larger installations, cabinets
are mounted side by
side
to provide sufficient
accommodation for the batteries.
Overall depth of 725mm is required to allow a
ventilation gap of 75mm (rubber back-stop provided
ensures this distance is maintained). Cabinets may
be mounted side-by-side since no side ventilation is
required.