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EN54-23 Coverage Data & Explanation of Terminology
Ceiling Mounted Devices- C-x-y
C - Ceiling mounted Device
x - The maximum height of 3, 6 or 9m at which the VAD may be mounted.
y - The diameter in metres of the cylindrical volume covered (to a minimum level of 0.4 lux) when the device is
mounted to the ceiling at a height of 3, 6, or 9 m.
Example:
C-3-32 corresponds to a ceiling mounted device giving a coverage cylindrical volume of 32 m, when mounted
at 3 m.
Note: The projected space sits within the cylindrical volume and ensures that all areas meet the required
illumination of 0.4 lux.
Tip: To convert the coverage diameter y to the width of a square room.
Width of square room = y/1.414 m.
Wall Mounted Devices- W-x-y
W - Wall mounted Device
x - The maximum height of the device on the wall in metres, with a minimum value of 2.4.m
y – The width in metres of the square volume covered (to a minimum level of 0.4 lux) when the device is
mounted at a height x
Example:
W-8-13 corresponds to a wall mounted device giving a coverage cuboid volume of 8 m x 13 m x 13 m, when
mounted at a height of 8 m.
Tip: if the area to be covered is not square, use the larger of either the length or width to ensure that the
whole area is covered
Further information is available via the Code of practice (CoP 0001.)
CoP 0001 provides detailed guidance and recommendations on the planning, design, installation,
commissioning and maintenance of VAD's. A copy is available at the following website:
http://www.redbooklive.com/pdf/CoP-0001-1-0.pdf
03/16
MEDC VAD Coverage Data
Ceiling Mounted
Red lens
White lens
Wall Mounted
C-3-16
W-3-5
C-6-6
C-3-32
C-6-31
W-8-13
C-9-12
© MEDC 2016
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