ANSI C29.9:2017 pdf free download – American National Standard for Wet Process Porcelain Insulators – Apparatus, Post Type
8.2.5 Thermal Shock One insulator shall be selected at random and tested for 1 0 complete cycles in accordance with Clause 5.5 of ANSI C29.1 , Thermal Test. For multiunit insulators, one of each type of unit in the stack shall be tested. The temperature of the hot water bath shall be approximately 1 50°F (66°C), and the temperature of the cold water bath shall be approximately 39°F (4°C). At the end of the tenth cycle, the test specimens shall be checked for electrical soundness. If the insulator or one of the insulator units fails to meet the requirements for electrical soundness, the retest procedure of Clause 4.4 shall apply.
8.2.6 Compression Strength Three insulators shall be selected at random and tested in accordance with Clause 5.1 .4.4 of ANSI C29.1 , Compression Strength. For multiunit insulators, three of each type of unit in the stack shall be tested. If any insulator or any insulator unit fails to equal or exceed the strength requirement in Table 1 or Table 2 as appropriate (or a higher strength requirement if so indicated on the manufacturer’s drawing), the retest procedure of Clause 4.4 shall apply.
8.2.7 Torsional Strength Three insulators shall be selected at random and tested in accordance with Clause 5.1 .4.2 of ANSI C29.1 , Torsional Strength. For multiunit insulators, one of each type of unit in the stack shall be tested. If any insulator or any insulator unit fails to equal or exceed the strength requirement in Table 1 or Table 2 as appropriate (or a higher strength requirement if so indicated on the manufacturer’s drawing), the retest procedure of Clause 4.4 shall apply.
8.3.1 Visual and Dimensional Tests Conformity with 5.2 may be determined by visual inspection. All insulators not conforming to 5.2 fail to meet the requirements of this standard. The required number (n) of sample insulators shall be selected at random from the lot and the dimensions checked against the dimensions on the manufacturer’s drawing. Failure of the insulators to conform, within manufacturing tolerances, to the dimensions on this drawing shall constitute failure of the lot to meet the requirements of this standard.
8.3.4 Cantilever Strength The sample insulator(s) shall be selected at random and tested in accordance with Clause 5.1 .4.1 of ANSI C29.1 , Cantilever Strength. Failure of the strength of more than one of the insulators to meet the strength requirement given in Table 1 or Table 2 shall constitute failure of the lot to meet the requirements of this standard. If one insulator fails to meet the strength requirement, the retest procedure of Clause 4.4 shall apply.
8.3.5 Tensile Strength The sample insulator(s) shall be selected at random and tested in accordance with Clause 5.1 .4.3 of ANSI C29.1 , Tensile Strength. Failure of the strength of more than one of the insulator(s) to meet the strength requirement given in Table 1 or Table 2 shall constitute failure of the lot to meet the requirements of this standard. If one insulator fails to meet the strength requirement, the retest procedure of Clause 4.4 shall apply.