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Tel
01424 856600
Fax
01424 856611
Technical Hotline
+44 (0) 1424 856688
258 |
PVC-U Perimeter trunking systems
Technical information
Material
PVC-U is flame retardant and self-
extinguishing. It provides a 100%
recyclable material with good
sustainability.
Installation
Positioning
When used as a skirting system,
sufficient clearance should be allowed
between the floor covering and the
profile fittings that clip over the cover
i.e. 5mm + floor covering is
recommended.
Expansion/contraction
PVC-U expands and contracts at a
uniform rate of approx 5.25mm in a 3
metre length for a temperature change
of 25°C. Therefore, a 3mm gap between
each length of trunking base is
recommended.
Adequate allowance is made within
the fittings for thermal movement of
the covers, which have a 10mm
overlap on each side.
Fitting
• The base is supplied with pre-cut
elongated holes at 250mm centres.
• Internal couplers on base units are
not required.
• To fasten base, use No 8 round head
screws and washers.
• Avoid over-tightening to permit
thermal movement.
• The use of plastic caps over screw
heads is recommended to protect
installed cables.
• To cut the trunking, use a fine-
toothed panel or power jig-saw.
• External moulded fittings overlap the
joints by up to 10mm to cover
cutting inaccuracies.
• A variable angle jig-saw or chop saw
is recommended for cutting 45°
mitres.
Single lengths
Where it is required to fit a single
length of trunking (under 3 metres)
between two inside walls and no
accessory box is fitted, it is advisable to
install a coupler in the centre of the run
to facilitate the removal of the cover.
Joints and bend
• Base joints should have a 3mm gap
to allow for expansion.
• External bends: base should be cut
square and segregators inserted as
shown in drawing below.
• Internal bends and flat angles, the
base must be mitred 45° to ensure
total enclosure of trunking, including
any internal fitted segregator.
• Tees and crossovers are available
prefabricated.
• External moulded fittings overlap the
joints by up to 7mm to cover cutting
inaccuracies.
Bend radius control
For data bend radius control fittings for
XL, please contact the Technical Team
on 01424 856688.
Accessory boxes
• If accessory box main compartment
is supplied from an outer
compartment, drill the main web
adjacent to the box position.
• Remove the appropriate knock out
and clip the box into the trunking
base.
• For boxes in the same compartment
as the supply, remove the
appropriate box knock-outs and clip
the box into trunking base.
• When boxes are installed
consecutively, a 14mm wide spacer
(ES1) is required to cover the space
between the boxes.
• Part M box assemblies with
contrasting coloured faceplates are
available to meet the requirements of
DDA regulations for Visual
Impairment.
Covers
The covers have been designed to
remain in position irrespective of
impact during normal conditions,
minor undulations of the mounting
surface, and to limit unauthorised
removal.
Covers – fitting
Covers are clipped into place from the
front. If accessory boxes are installed,
the covers are butt-joined to the edge
of the box (ESSB1 and 2 only) and the
cut edges of lids are subsequently
concealed by the accessory. For fittings,
a gap of 30mm is left between the two
cover ends to permit the fitting to clip
to the base.
Covers – removal
To remove a cover, first detach a
coupler, internal or external bend
component to gain access. The main
cover can then be gently eased off the
base. To remove the outer cover, firstly
ease from the base by inserting the
blade of a terminal screwdriver
between the captive legs of the cover
and the base and then peel off.
Screening
Special conductive spray coating can
be applied to one compartment, the
cover, accessory boxes and fittings, to
screen data cables against EMI
interference.
•
For data/voice circuits only:
Warning: Owing to its relatively high
surface resistance, CS coating
SHOULD NOT be in contact with low
voltage circuits BS7671 (1992) 50
V.A.C. – 1000 V.A.C. unless additional
measures are undertaken.
Antimicrobial
For technical details of antimicrobial
XL Bio trunking, please refer to
Laboratory and Healthcare section.
Method of continuation through a
partitionwall
Continue the main lateral run of base
through the partition wall with short
lengths of cover fitted where the
trunking passes through the partition.
The partition wall trunking is then
butted up to the main run and the
joint covered by an Internal bend.
(as shown below)
INSERT SCREWDRIVER
INTO SHADED AREA
LEVER OUT
DRILL HOLE OF
SUITABLE SIZE
PARTITION WALL
COVERS TO BE FITTED
BEFORE BASE IS INSTALLED
XL trunking
5mm +
FLOOR
COVERING
