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TECHNICAL INFORMATION
Technical information
294 |
Aluminium trunking systems
Material
Aluminium trunking is manufactured
from high precision extruded
aluminium with a powder coat finish.
White RAL 9016
Silver Grey RAL 9006
Accessory boxes are supplied in PVC-U
or polycarbonate both of which are
100% recyclable.
Installation
Positioning
Suitable for dado and skirting
installation. 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.
Fitting
• Secure trunking base every 750mm.
• Secure using No 8 round head screws
and washers using the grooves in the
outer compartments of the base to
facilitate drilling Ø6mm holes.
• 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 tooth
blade (32/36tpi) or, preferably,a
circular saw with a 350mm fine
tungsten blade (90/108tpi). This will
produce an edge requiring minimal
de-burring.
• Consecutive lengths of base are
aligned and butt jointed together.
Earthing
• Clean protective coating from base,
covers and metallic fittings and then
earth bond.
• Incoming earth connection is made
using LTB1 bonding assembly
installed in the earth channel of the
base.
• Bonding base to base: in final ring or
radial 32Amp circuits, bonding strap
LBS1 can be used.
• Bonding covers and end caps to
base: use bonding strap LBS2.
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
• Moulded from colour-matching
polycarbonate. External bends: base
should be cut square at the corner
and the internal segregator inserted
into the web of each base.
• Internal bends: base must be mitred
45° to ensure total enclosure of
trunking, including any internal fitted
segregator.
• External moulded fittings overlap
the joints by up to 10mm to cover
cutting inaccuracies.
Bend radius control
The bend radius control fittings for
Twin Plus provide a bend radius of
50mm
Accessory boxes
• If the accessory box is to be mounted
in the alternative compartment to the
supply, 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. For the fitting of couplers to
conceal the cover joint, a gap of 25mm
is left between the two cover ends.
Covers – removal
To remove a cover, first detach a
coupler, internal or external bend
component to gain access. Both covers
can then be gently eased off the base.
Screening
Aluminium containment will protect
all internal circuits from external
electromagnetic interference. For
internal segregation and screening, use
a screened dividing fillet.
Method of continuation through
a partition wall
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.
Offset dimensions
The minimum set that can be
accommodated in the same plane
(from internal to external bend), is
shown below.
169mm
Twin Plus aluminium
210
210
244
227
17
17
17