What is the primary method used to test full-size poles?

The cantilever bending test is most commonly used to simulate the actual in-service loading of a pole planted in the ground.

Are minor tests required alongside full-size tests?

Yes, minor tests on small clear specimens cut from the uninjured portion of the tested pole are conducted as per IS 1708 for correlation.

How is moisture content determined?

By taking disc samples near the point of failure and oven-drying them at 103 ± 2 °C until a constant weight is achieved.

IS 1900

: 1974

Methods of tests for wood poles

CurrentSpecializedTesting MethodMaterials Science · Timber and Timber Stores

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This standard prescribes the methods for testing full-size wood poles to determine their structural strength and elastic properties. It primarily covers the cantilever bending test and machine test to evaluate poles used in overhead power and telecommunication lines.

Methods of tests for wood poles

Quick Reference Values

Oven drying temperature for moisture content103 ± 2 °C

Length of gripping for cantilever testFrom butt end to the specified ground line

Key Formulas

Modulus of Rupture (MOR) = 32 * P * L / (π * d^3) — Equivalent fibre stress at maximum load for circular poles

Practical Notes

Properly secure the pole from the butt end to the ground line during the cantilever test to accurately simulate field embedment conditions.

Timber strength is highly sensitive to moisture; accurate determination of moisture content at the time of testing is critical.

Always record visible defects such as knots, splits, or cross-grain before testing, as these are frequent initiation points for failure.