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35mm Dual Dry Lining Box - White PVC

£149
The RRP is the manufacturer's recommended retail price of the item.
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Minimum order for this item is 10.

Description

The Knightsbridge SN8380D is a 35mm deep dual dry lining box designed for mounting 2-gang electrical accessories into plasterboard and cavity walls. The white PVC box measures 169mm wide by 83mm high externally, with a 159x73mm cut-out requirement in the plasterboard. Two red spring-loaded grip flanges clamp the box securely to the reverse side of the plasterboard once pushed through the cut-out aperture.

Designed for residential and light commercial installations where 2-gang switches, sockets or dimmer plates are being fitted into stud walls, the box accepts standard UK wiring accessories without requiring additional back boxes. Two 20mm knockouts at the rear provide cable entry points, while moulded channels at the top and bottom edges guide cables neatly into position during installation. The 35mm depth accommodates most standard accessories and provides enough space for cable terminations behind deeper switches and dimmers.

The PVC construction is certified to BS 5733, the UK standard for electrical accessory boxes in non-metallic enclosures. The white finish blends with standard white plasterboard once the faceplate is fitted. The box ships in shrink-sealed Knightsbridge multipacks, with each unit individually protected during storage and transit. The 25-year warranty covers manufacturing defects and material failure under normal domestic use.

Specification
Height 83 mm
Width 169 mm
Recessed Depth 35 mm
Cut-out Box W/H/D 159x73 mm
Construction PVC
Finish White
Warranty 25
Downloads

Product Specification Sheet

Frequently Asked

What plasterboard thickness does this box support?

The spring-loaded grip flanges accommodate standard UK plasterboard thicknesses from 9.5mm to 12.5mm. The flanges clamp against the reverse side of the plasterboard once the box is pushed through the cut-out aperture.

What size cut-out is required?

The plasterboard requires a 159mm wide by 73mm high rectangular cut-out. Mark and cut the aperture with a padsaw or drywall saw before inserting the box.

Is this suitable for metal-clad accessories?

No. This is a non-metallic PVC box certified to BS 5733 for use with standard plastic-backed switches and sockets. For metal-clad accessories a metal back box with earthing provision is required.

How are cables routed into the box?

Two 20mm knockouts at the rear provide cable entry points. Additional moulded channels at the top and bottom edges guide cables into position during installation. Cables can enter from above, below or directly from the rear depending on the stud wall cavity route.

Shipping & Returns

Free worldwide delivery

Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

Returns

30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.

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    Description

    The Knightsbridge SN8380D is a 35mm deep dual dry lining box designed for mounting 2-gang electrical accessories into plasterboard and cavity walls. The white PVC box measures 169mm wide by 83mm high externally, with a 159x73mm cut-out requirement in the plasterboard. Two red spring-loaded grip flanges clamp the box securely to the reverse side of the plasterboard once pushed through the cut-out aperture.

    Designed for residential and light commercial installations where 2-gang switches, sockets or dimmer plates are being fitted into stud walls, the box accepts standard UK wiring accessories without requiring additional back boxes. Two 20mm knockouts at the rear provide cable entry points, while moulded channels at the top and bottom edges guide cables neatly into position during installation. The 35mm depth accommodates most standard accessories and provides enough space for cable terminations behind deeper switches and dimmers.

    The PVC construction is certified to BS 5733, the UK standard for electrical accessory boxes in non-metallic enclosures. The white finish blends with standard white plasterboard once the faceplate is fitted. The box ships in shrink-sealed Knightsbridge multipacks, with each unit individually protected during storage and transit. The 25-year warranty covers manufacturing defects and material failure under normal domestic use.

    Specification
    Height 83 mm
    Width 169 mm
    Recessed Depth 35 mm
    Cut-out Box W/H/D 159x73 mm
    Construction PVC
    Finish White
    Warranty 25
    Downloads

    Product Specification Sheet

    Frequently Asked

    What plasterboard thickness does this box support?

    The spring-loaded grip flanges accommodate standard UK plasterboard thicknesses from 9.5mm to 12.5mm. The flanges clamp against the reverse side of the plasterboard once the box is pushed through the cut-out aperture.

    What size cut-out is required?

    The plasterboard requires a 159mm wide by 73mm high rectangular cut-out. Mark and cut the aperture with a padsaw or drywall saw before inserting the box.

    Is this suitable for metal-clad accessories?

    No. This is a non-metallic PVC box certified to BS 5733 for use with standard plastic-backed switches and sockets. For metal-clad accessories a metal back box with earthing provision is required.

    How are cables routed into the box?

    Two 20mm knockouts at the rear provide cable entry points. Additional moulded channels at the top and bottom edges guide cables into position during installation. Cables can enter from above, below or directly from the rear depending on the stud wall cavity route.

    Shipping & Returns

    Free worldwide delivery

    Free worldwide delivery on all orders over £99. International orders for third-party brand products may be subject to an additional courier surcharge based on volumetric weight, particularly on larger lighting fixtures — if a surcharge applies, our team will email you with the amount before dispatch and you can proceed or cancel for a full refund. See full delivery terms.

    Returns

    30-day returns window from delivery. As all our products are electrical or lighting goods, returned items must be inspected and recertified by a qualified electrician before resale — the cost of this inspection (25–40% of the item value) is deducted from your refund. Customers pay return shipping. Made-to-order, special-order and clearance items cannot be returned. See full returns policy.