Sparks Electrical News March 2015

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sparks
ELECTRICAL NEWS march 2015
lighting
18
LEGRAND’S lighting andmotionman-
agement systems, which are designed
tomake industrial, commercial and do-
mestic buildings more energy efficient,
encompass switch sensors that reduce
the amount of time lighting is left on
unnecessarily.
“Lighting, together with heating and
air-conditioning, accounts for the great-
est energy consumption and electric-
ity costs of a building,”says Luk Ivens,
general manager, Legrand Southern
Africa.“With the installation of an auto-
matic lighting andmotionmanagement
system, which ensures there is exactly the
right amount of light when and where it
is needed, energy savings of up to 60%
can be achieved. Reduced lighting usage
not only lowers operating costs, but also
helps decrease Green House Gas (GHG)
emissions. Additional savings include
reduced lamp replacement andmain-
tenance requirements and lower power
demand during peak hours. Because vari-
ous areas in a building require different
lighting control strategies, we recom-
Light when you need it
Legrand’s lighting and motion
management systems reduce the
amount of time lights are left on
unnecessarily, saving hours of
wasted electricity each day. The Legrand PIR ceiling mounted lighting management sensor, with 180° infrared detection, is ideal
for passageways
mend a number of solutions tomaximise
energy savings and to ensure absolute
comfort for occupants of the building.”
Legrand’s lightingmanagement
sensors are used tomonitor the detec-
tion area for occupancy and to control
lighting and HVAC circuits. Lighting is
automatically switched on when a person
is sensed. Where sensors are equipped
with a built-in light level sensor, the
lighting will be kept off when sufficient
natural light is available. When the area
is vacated, the lighting automatically
switches off after a pre-set time delay.
Motion sensors, with an automatic
switch on/off facility, are recommended
for areas with little or no natural light, for
example in passageways, bathrooms and
equipment rooms.
Passive infrared (PIR) technology of mo-
tion sensors detects occupancy up to 8m,
by identifying the difference between
heat emitted from the human body in
motion and the background space.
Lightingmanagement sensors -
designed for shops, offices, healthcare
buildings and warehouses - have a man-
ual or automatic switch on/off, according
to whether there is anyone present and
the natural light level. These sensors have
built-in adjustable lux sensors that keep
the lighting switched off if there sufficient
natural light.
Detection of lightingmanagement
sensors is based on PIR technology and
dual technology (DT) which ensures
maximum sensitivity and coverage in
applications for optimum reliability and
energy saving. Legrand sensors work in
occupancy mode, where are lights are
automatically switched on or off accord-
ing to occupancy, or in vacancy mode for
additional energy saving, where lights are
manually switched on and automati-
cally switched off when the person
leaves the area.
For enhanced flexibility, switch
sensors can be combined with room
controllers tomanage a number of
lighting and ventilation circuits. For
example, in areas where daylight is
unevenly distributed, a sensor can be
combined with a row of luminaires to
measure motion and light levels. The
dimming controller regulates each row
of luminaires and supplements the
external light to obtain the required
pre-set light level.
Once the sensor and controls have
been selected for each installation,
Legrand offers a choice of local BUS/
SCS control or the global BUS/KNX
solution for lightingmanagement.
BUS/SCS (simplified cabling system)
wiring enables local and remote
presence and light level detection
andmanagement. Every installation,
which also includes time and scenario
management functions, is designed,
monitored and supervised on a PC, us-
ing Legrand’s advanced software.
As an addition to this local control
system, the wireless Radio/ZigBee
system can be used to install new ra-
dio control points, without damaging
walls. This system is ideal for refurbish-
ment installations or glazed surfaces.
In addition to BUS/SCS, BUS/KNX
wiring enables supervision and inte-
gration of other building applications,
including emergency lighting, HVAC
and fire alarms. This building control
system enhances energy and operat-
ing performance, also ensuring ease of
maintenance.
Enquiries: +27 11 444 7971