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mkelectric.co.uk
692
FLOOR SYSTEMS
SCREEDED
Cablelink Plus Screed
Technical
6
Ratchet Release
Unlock Position
7
Plug
Clearance
Wiring
Space
Screed
Depth
Installation Guide for Underfloor Duct System
The structural floor slabs on which the underfloor ducts and boxes
are to be laid must be reasonably level and smooth. Humps and
protruding cement must be levelled to ensure the ducts being
laid will maintain the minimum screed thickness of 25mm over
the ducts. It is recommended that a layer of green screed be laid
on the structural slab beneath the underfloor ducts to prevent air
gaps and vacuum while screeding.
1
The floor slab where junction and service outlet boxes are to
be laid should be marked out. The appropriate duct entry plates
should be fastened to the boxes.
Ducts should be laid in straight lines between points of junction
boxes and parallel to known base lines on each floor. Changes in
direction of ducts should be made with junction boxes.
Use steel fixing clips to secure the ducts on to the floor slab
prior to screeding. The intervals between two saddles should not
exceed a maximum of 2 metres.
All joints in ducts and terminations of ducts in junction boxes /
vertical access boxes should be made water tight with approved
type sealing compound. Precaution should be exercised during
construction to prevent damage to the ducts system and to ensure
that the ducts and vertical boxes are free of water, dirt, debris or
any other obstruction which may impede and / or damage the
cables during pulling in.
2
Junction and service outlet boxes should be properly covered
with the disposable lids and taped to ensure no cement gets into
the boxes during screeding.
After screeding the disposable screed cover is removed and the
cable installation can begin.
3
If extra space is required under the accessory mounting tray
then height adjuster kits can be used. The cables can now be
installed and the services terminated.
Note:
The bases are supplied with 35mm wiring space, with the option to
reduce to 25mm or increase to 45mm with a height adjustment kit – part
number CUBA-1 see page 417.
4
The frame and lid assembly can now be fitted. Ensure the
ratchet release is set to the lock position and align these with the
ratchets in the accessory tray.
5
Apply gentle pressure until the frame is securely seated in the
box and against the finished floor e.g. carpet or vinyl.
6
If the frame and lid assembly requires to be removed or
rotated to ease cable egress then the ratchet releases should be
rotated to the unlock position and the frame can be lifted out of the
floorbox. The assembly can then be rotated and fixed as before.
Note:
The lid should be completely removed from the frame before
attempting to release the frame.
7
Attention must be paid to ensure there is both sufficient wiring
depth and plug top clearance for the particular cables / plugs
being used in each installation.
1
2
3
A
B
5
4
Ratchet Release
Lock Position
Cablelink Plus Screed System