What types of joints are specified in this standard?

The standard specifies two main types: the scarf joint and the fish-plated butt joint.

Does this standard specify the type of wood to be used?

It refers to other Indian Standards like IS 2190 for the selection, storing and seasoning of timber for electrical poles.

Is preservative treatment for the wood poles mandatory?

Yes, preservative treatment in accordance with standards like IS 401 is essential for durability and to protect against decay and insects.

IS 6056

: 1970

jointed wood poles for overhead power and telecommunication lines

CurrentRareSpecificationStructural Engineering · Timber and Timber Stores

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This standard provides specifications for the materials, dimensions, and construction of jointed wood poles used for supporting overhead power and telecommunication lines. It covers types of joints, such as scarf joints and butt joints with fish plates, and the requirements for timber selection and preservative treatment.

jointed wood poles for overhead power and telecommunication lines

Quick Reference Values

Specified joint type 1Scarf Joint

Specified joint type 2Fish-plated Butt Joint

Minimum length of scarf joint1.5 m

Minimum bolt diameter for fish plates16 mm

Practical Notes

This standard is largely obsolete for new projects, as single-piece poles made of concrete, steel, or composite materials are now preferred for reliability and longevity.

It may be referenced for the assessment, repair, or maintenance of existing older electrical or telecommunication networks, particularly in rural or remote areas.

Proper preservative treatment of the wood, especially at the joint and ground line, is critical to the performance and safety of these poles.