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TECHNICAL INFORMATION
Technical information
278 |
PVC-U perimeter trunking systems
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. Fittings have a
10mm overlap on each side to allow
for thermal movement of the covers.
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.
• To increase number of compartments
to any number required, use base
extension EBE1WH and extendable
base EEB1.
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 bends
• Base joints should have a 3mm gap
to allow for expansion.
• Internal, external bends and flat
angles, the base must be mitred
45° to ensure total enclosure of
trunking, including any internal fitted
segregator.
• Flat angles, tees and crossovers are
available prefabricated.
• External moulded fittings overlap
the joints by up to 10mm to cover
cutting inaccuracies.
Covers
Covers are designed to limit
unauthorised removal and to remain
in position during normal conditions
irrespective of impact and minor
undulations of the mounting surface.
Covers – fitting
Covers are clipped into place from
front. If accessory boxes are installed,
the ETL1 cover is butt-joined to the
edge of the box. Cut edges of the cover
are subsequently concealed by the
accessory. For fittings, a gap of 25mm
is left between the two cover ends to
permit the fitting to clip to 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 ease away from
the base.
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
Sterling Profile Bio trunking, please
refer to Laboratory and Healthcare
section on page 36.
C.&C.MarshallLtd.
Sterling Profile trunking
Bend radius control
The data internal and external bend
radius control fittings for Sterling
Profile trunking provide a bend radius
of 50mm.
Accessory boxes
• For mounting an accessory box in the
alternative compartment to supply.
Fit the box and remove the closest
knockout in the main web.
• 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.
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