30 Selhurst Road, South Norwood, London SE25 5QF

Tel: 020 8683 1126 Fax: 020 8689 7896

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Underfloor, In-Screed Trunking

A range of trunking that is designed to be buried in the floor screed, with services brought out through service outlet boxes and junction boxes


Design to be laid and wired prior to screeding


Trunking available in any width, any depth, any number of compartments


Standard Junction boxes are supplied with a height adjustable 6mm recessed lid


Junction boxes can be supplied in brass or stainless steel finish, with any lid recess, to suit our 700 series range of floor boxes

- Minimum screed depth required for use with service boxes is only 55mm, (500 series and 2000 series only, 65mm minimum for 700 series)
Ranges held in Stock:
  Range U2
- 2 compartment 150 x 25mm trunking
- Junction box size 200x200mm (outer box 210x210mm)
  Range U3
- 3 compartment 225 x 25mm trunking
- Junction box size 300x300mm (outer box 310x310mm)
Ref 94 Junction box with Standard galvanised steel lid with 6mm recess. Standard depth 65mm, others to order, minimum depth 55mm   Ref 94ST Junction box with 25mm lid recess in stainless steel, shown with corner blocks on stainless stel lid and frame (also available with trim flange)
Common Accessories:
Ref 91 2m length trunking
Ref 92 Vertical Bend
Ref 93 Horizontal bend (in screed)
Ref 94 Junction box (Cross)
Ref 95 Junction box (Tee)
Ref 96 Junction box (Angle)
Ref 97 Junction box (through)
Ref 38 End cap
Ref 45 45 deg bend ( in screed)
Ref 41 Copper earth link
Ref 56/58 Additional body connectors
Ref 92 Vertical bend
Ref 93 Horizontal bend


To order quote Range and Part Reference, for example U3-91 for a 2m length of U3 profile. Please quote DEPTH OF SCREED when ordering junction boxes or service boxes as these are made to suit. Please note that ref U3-91 is sometime also referred to as ref U3-90.

Service Boxes

All ranges of floor boxes are suitable for use with underfloor trunking

Specifiers guide and ordering information

Savill Building, Windsor Great Park
A sample of U3 trunking, of increased guage material (2.0mm lid and 1.5mm body) was load tested to 5 Tonnes
Load test for U3/94-STST 700+ Junction box

Cableduct Limited, Manufacturer's of the largest range of Standard cable management products, including: Floor boxes; screed floor box, cavity floor box, screed floor boxes, cavity floor boxes, service outlet boxes, Screed floor boxes; in screed outlet box; Stainless steel floor box; brass floor box; stainless steel outlet box; brass outlet box; round stainless steel floor box; round brass floor box; screed trunking; underfloor trunking; surface trunking; dado and skirting trunking; pedestal boxes; service poles London