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Description & Commissioning
'C' and 'O' Category Visual Alarm Coverage
What is 'C' Category (Ceiling-mounted) coverage volume
Surface Minimum
illumination
2
of 0.4Lm/m
Example
A C-3-14 could be mounted at 3m and have a square spacing of 9.9m; however the recommendations of CoP 0001 must be applied.
40
35
30
25
20
15
10
5
0
o
o
o
o
-90
-75
-45
-60
What is 'O' Category (Open category) coverage volume
The open 'O' category allows coverage volume to be specified, to remove the limitations on the mounting height of a 'C' category
Visual Alarm Device (VAD). Gent by Honeywell 'O' category specification has exactly the same cylindrical shape, however the
mounting height 'x' allows more flexibility, being specified between 3m and 6m.
"
All S-Quad VADs have a defined 'C' Category for each power setting and an 'O' category to allow it to meet
the needs of building applications.
Example
An O-5-14 could be mounted at 5m and have a square spacing of 10m. It should become apparent why the enhanced mounting
height may become critical when the recommendation of CoP 0001 are applied.
4
1.414
o
o
o
o
-15
0
15
-30
30
y
x
y
Typical plot that shows the
performance of the White
VAD on medium power setting
o
o
o
o
60
75
45
90
A ceiling-mounted Visual
Alarm Device (VAD) covers a
cylindrical volume with a
minimum effective illuminance
of 0.4 Lux.
The coverage volume is stated
as
C-x-y
¨
where C is the ceiling
mounted category
¨
'x' is the maximum
mounting height in
metres and
¨
'y' is the maximum
diameter in metres.
The 'C' category is currently
restrictive and only allows
mounting heights to be
specified as 3, 6 or 9 metres.
This diagram shows how to
relate the cylindrical volume to
a square spacing volume.
Note the diameter 'y' is divided
by 1.414.
C-5-14
Actual
4188-1073 issue 3_2-17_P2_S-Quad
S-Quad
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