Collapse Tester For Rigid Non - Metallic Conduit
Non-metallic conduits used in electric wiring shall be sufficiently sturdy so as not to collapse when bent during laying. The ability of these conduits to bend without causing excessive deformation in their cross section or reduction in their cross-sectional area is determined by bending a portion of the conduit through an angle of 90°, maintaining it under bent condition for a period 24 hours inside a hot air oven maintained at a temperature of 60 ± 2°C, and subsequently passing a barrel shaped go-gauge through it. The gauge shall pass through the bent conduit under its own weight without any restriction.
This test is applicable to conduits of 16, 20, and 25 mm nominal sizes only.
The Collapse Tester for electrical conduits consists of a jig for firmly holding a test specimen taken from the conduit under test in a bent state and a stand to mount the jig in a vertical plane such that a barrel shaped gauge can be passed through the conduit under its own weight under the effect of gravity.
IS 9537 (Part 1) - 1980 : Specification for Conduits for Electrical Installations
Part 1 : General Requirements
IS 9537 (Part 3) - 1983 : Specification for Conduits for Electrical Installations
Part 3 : Rigid Plain Conduits of Insulating Materials
IS 9537 (Part 4) - 1983 : Specification for Conduits for Electrical Installations
Part 4 : Pliable Self-recovering Conduits of Insulating Materials