What are the standard nominal sizes (DN) available for these ducts?

Nominal sizes range from 32 mm to 160 mm as specified in Table 1.

What is the standard length of a duct?

The standard effective length is 6 meters, unless otherwise agreed upon (Clause 5.4).

What is the minimum required Vicat Softening Temperature?

The Vicat Softening Temperature must be a minimum of 79°C when tested according to IS 10148 (Table 3).

What type of material is specified for the ducts?

The material shall be a rigid (unplasticized) PVC compound conforming to the requirements of Designation PVC-U-D of IS 10151 (Clause 4.1).

IS 14735

: 1999

Unplasticized PVC Pipes (Ducts) and Fittings for Underground Telecommunications Cable Installation

CurrentSpecializedSpecificationMaterials Science · Plastic Piping System

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This standard specifies the requirements for unplasticized PVC (uPVC) ducts and their fittings intended for use in underground installations for telecommunication cables. It covers material composition, dimensions, physical and mechanical properties, and testing methods to ensure the protection and integrity of the cable network.

Unplasticized PVC Pipes (Ducts) and Fittings for Underground Telecommunications Cable Installation

Quick Reference Values

Standard duct length6.0 metres

Minimum Vicat softening temperature79 °C

Minimum tensile strength at 27°C45 MPa

Maximum Reversion5 %

Impact test temperature0 ± 1 °C

Standard colourGrey or White

Practical Notes

Proper jointing using solvent cement (as per IS 14182) is critical for maintaining the integrity of the duct line and preventing ingress of soil or water.

The standard specifies grey or white as standard colors, but other colors can be used by agreement, which is useful for utility identification.

The impact strength test is performed at 0°C, reflecting the need for toughness during handling and installation in colder conditions.