STERLING PVC TRUNKING SYSTEMS

GENERAL GUIDELINES
The properties of PVC-U (unplasticised polyvinyl chloride) make it an ideal cable trunking material. Resistant to impact and inert to atmospheric environments. The Sterling range is a ‘clip-on’ modular system ideal for the management of data, communication and power cables.

Available in Mono, Mono Plus, Compact, Sterling and Sterling XL ranges, with multi-segregated compartments for both dado and skirting, mounting in either a horizontal or vertical plane.

Fully compatible with the current range of switches, sockets and outlet units. Adaptable to accommodate future wiring alterations or additions.

EXPANSION/CONTRACTION

PVC-U expands/contracts at a uniform rate approx 5.25mm in a 3 metre length for a temperature change of 25°C.

Adequate allowance is made for thermal movement, within the fittings, which have a 10mm overlap on each side. A 3mm gap between each length of trunking base is recommended.

POSITIONING
When using as a skirting system sufficient clearance should be allowed for between the floor covering and the profile fittings which clip over the cover (5mm + floor covering).

INSTALLATION

All Sterling bases are supplied with pre-cut elongated holes at 250mm centres along its length to facilitate fastening. Internal Couplers on the base units are not required.

When fastening the base use No. 8 round head screws and washers, avoid over tightening to permit thermal movement. When aluminium screening is to be fitted the pre-cut elongated holes cannot be used. Therefore, drilling of a 6mm hole through screening and base is necessary. Fasten in the manner previously described. To cut the trunking use a fine toothed panel or
power jig-saw. The cutting does not have to be critical as the external profile fittings overlap the joints by up to 10mm and cover any inaccuracies. An electric variable angle jig-saw will aid with the cutting to length and the 45 degree mitres of the trunking base.

SINGLE LENGTHS

Where it is required to fit a single length of trunking between two inside walls (under 3 metres) it is advisable to place an additional coupler set in the centre of the trunking run to facilitate the removal of the cover if no accessory has been fitted

JOINTS AND BENDS

All joints should have a 3mm gap to allow for expansion and at corners the trunking base MUST be mitred to ensure total enclosure of trunking if no internal segregator is to be fitted. This is not critical as the fittings cover the joint and overlap the trunking covers.

MONO PLUS/XL EXTERNAL BENDS

Mono Plus and XL should be cut square at the corner and an internal segregator inserted as shown in Diagram 1 Mono Plus, Diagram 2 XL which gives additional retention to the clip-on fitting.

MONO/MONO PLUS ACCESSORY BOXES

Remove the appropriate KO or drill the box and feed the cables into the box and clip into the desired location. For the outer compartments (Mono Plus) clip the dividing segregator into position between each accessory box.

COMPACT/STERLING/XL TRUNKING ACCESSORY BOXES

Drill the main web and any Data Accessory Boxes in the desired position. For main compartment supply, remove the appropriate box knock-outs, feed the cable into box and then clip the box into trunking base. When assembled the lid is butt joined to the edge of the box (ESSB1/2/3 only) which is subsequently covered when the accessory is fitted. When boxes are installed consecutively a 14mm wide spacer (ES1) is required to cover the space between the boxes. All cut edges of lid are concealed by the accessory or external fitting.

LID REMOVAL

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. All lids peel off, although the angle and square lids should be eased from the base by inserting a terminal screwdriver between the captive legs of the lid and the base, by first removing an external fitting.