Bench Trunking utilises the successful Sterling compatible surface and flush clip-on accessories and can be subdivided with the use of Clip-in Divider Fillets. In both PVC-U and aluminium the option of material is available whatever the application.

MOUNTING

Secure the base in one plane only every 500mm by drilling alternate 6mm holes either side of the divider nib and fasten using No. 8 round head screws and washers. Do not over tighten to permit thermal movement and avoid distortion. See Material Data page 203 for thermal properties. Washers are not required on Aluminium Base.

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JOINTS

PVC-U base should be joined using a connector with 3mm of movement available between consecutive lengths of base. The lid part of the connector also has 10mm overlap on each side to facilitate thermal movement of the trunking due to change in temperature.
Aluminium base the consecutive lengths are aligned and butt jointed together.

FITTINGS

Dividing fillets are snapped on to the internal nibs in the base. Accessories and boxes clip direct into the trunking base and the lid cut to length and pressed into position. The lid connector is now aligned with the base connector (PVC-U only) and the end caps secured using a solvent adhesive MSC3 (PVC-U only) and the retaining screws for use with aluminium.

EARTHING (ALUMINIUM)

Covers, base and metallic fittings are to be cleaned of protective coating and earth bonded. Incoming earth connectors are made using the LBT1 Bonding Assembly installed in the earth channel of the base. In final ring or radial 32A circuits the bonding strap LBS1 may be used in the earth channel for bonding lengths of trunking. The base, cover and end caps should be bonded using the Bonding Strap LBS2.

LID REMOVAL PVC

This is best attended to at an accessory, end cap or coupler to avoid damage to the lid. Remove the fitting and applying light pressure under the lid peel off a small section (300mm) at a time.

LID REMOVAL ALUMINIUM

Remove accessory face plate cover and then gently ease lid from the base taking care to avoid damage.

DIMENSIONS AND CABLE CAPACITIES

A = 1285 sq mm total area 45% space factor = 578 sq mm. B = 2138 sq mm total area 45% space factor = 962 sq mm.

The installation should be in accordance with the latest edition of BS7671 (1992) Wiring Regulations.