IEEE C135.20-1998 pdf download IEEE Standard for Zinc-Coated Ferrous Insulator Clevises for Overhead Line Construction
1. Overview
1.1 Scope
This standard covers Zinc-coated ferrous clevises for spool-type insulators commonly used for supporting ordead-ending conductors in line construction.
The standards for spool-type insulators used with these clevises are covered in ANSI C29.3-1986
1.2 Application
Clevises and clevis pins conforming to this standard shall meet in all respects the dimensional and performance requirements hereinafter stated. The text, specifications. references to other standards, and associatedfigures supplement each other and shall be considered as part of this standard.
2.References
This standard shall be used in conjunction with the following publications. When the following standards aresuperseded by an approved revision, the revision shall apply.
ANSI C29.3-1986 (Reaff 1995), Wet-Process Porcelain Insulators (Spool Type).
ASTM A153/A153M-95, Zinc Coating (Hot-Dip) on Iron and Steel Hardware.
3. Materials
3.1 Clevises and clevis pins
Clevises and clevis pins for spool-type insulators shall be made from one of the following materials:
a) Hot rolled open-hearth steel;
b) Basic oxygen steel;
c) Electric furnace steel.
Materials shall be of a grade and quality suitable to meet the strength and performance requirements of this standard.
3.2 Cotters
Cotters for clevis pins shall be self-locking and made from corrosion-resistant materials.
4. Strength
4.1 Dead-end loading
Refer to Figures 1 through 5 for specific ultimate strengths.
Dead-end load shall be applied in a direction in line with the mounting bolt and perpendicular to the clevis pin. The clevis shall be capable of withstanding the specified ultimate strength loading without any permaent deformation.
4.2 Side loading
Items 5, 6, and 7 in Figure 3 shall be capable of withstanding a side pull loading of 4.5 kN (1000 lb) applied at 90 to the axis of both the mounting bolt and the clevis pin, without exceeding a test deflection of 10 mm (3/8 in) and a permanent deflection of 6 mm (1/4 in), measured at the center of the clevis pin.
5. Dimensions
Dimensions and tolerances shall be in accordance with Figures 1 through 6.
6. Testing
6.1 Porcelain spool insulators Appropriate porcelain spool insulators meeting the requirements of ANSI C29.3-1986 shall be used in test- ing. The load shall be applied by means of a loop of flexible stranded cable, the diameter of which shall not exceed the radius of the wire grooves of the spool insulators. The failure of the spool insulator, if such failure is related to the deformation of the clevis, shall also constitute a failure of the clevis.
6.2 Clevises
For testing, the clevises shall be attached to a steel block, and where applicable, the steel block shall have a radius conforming to the radius of the clevis.
IEEE C135.20-1998 pdf download
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