Civil Engineering Reference
In-Depth Information
Table 19 F
OC
values [
17
]
F
oc
Area
Systems without automatic presence or absence detection
1 Manual on/off Switch
0.95 Manual on/off Switch + additional automatic sweeping extinction signal 0.95
Systems with automatic presence and/or absence detection
0.95
Auto on /dimmed
0.9
Auto on /auto off
0.9
Manual on /dimmed
0.8
Manual on /auto off
required maintained illuminance. Such schemes are known as
“
controlled
constant illuminance systems
. As the light output decays with time, the con-
trols raise input power to the luminaire to compensate.
”
occupancy dependency factor (Fo) can be:
Fo = 1 if:
the lighting is switched on
'
centrally
'
, i.e., in more than one room at once
(e.g., a single automatic system
for instance with timer or manual
switch for an entire building, or for an entire
—
floor, or for all corridors,
etc.). This applies whatever the type of
'
off-switch
'
(automatic or manual,
central or per room, etc.).
the area illuminated by a group of luminaires that are (manually or
automatically) switched together, is larger than 30 m
2
.
Fo < 1 if:
in meeting rooms1 (whatever the area covered by 1 switch and/or by 1
detector), as long as they are not switched on
'
centrally
'
, i.e., together
with luminaires in other rooms;
in other rooms, if the area illuminated by a luminaire or by a group of
luminaires that are (manually or automatically) switched together, is not
larger than 30 m
2
, and if the luminaires are all in the same room. In
addition, in the case of systems with automatic presence and/or absence
detection the area covered by the detector should closely correspond to
the area illuminated by the luminaires that are controlled by that detector.
In both cases, also the conditions with respect to timing and dimming level
outlined below should be ful
lled. In these instances, F
O
should be determined as
follows:
F
O
¼ F
OC
þ
0
:
2
F
A
ð
45
Þ
The default value of F
OC
is
fixed as a function of the lighting control system, as
given in Table
19
.
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