1000016.1 115kV Polymer Suspension Insulators
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Revision 1
Dec 31, 2014
1. Scope
This specification applies to the District's requirements for composite, non-ceramic, polymeric suspension insulators for deadending conductors on a 115kV electrical transmission system. The polymeric covering, including the weathersheds, shall be made of silicone rubber.
2. Reference Standards
Insulators shall conform to the latest revisions of the following standards.
| Industry Standards | |
| ANSI C29.11 - 2012 | Composite Insulator Test Methods |
| ANSI C29.12 - 2013 | Composite Suspension Type Insulators |
| ASTM A-153 - 09 | Standard Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware |
| District Standards | |
| Compatible Unit I0701 | Insulator, Polymer Suspension w/ Anchor Shackle |
3. Material ID Numbers
This specification applies to the following District Material ID number: 1000016
4. Ratings
| Physical Specifications | |
| Section Length | 47.5" min - 48.5" max |
| Weathershed Diameter | 3.625" min |
| Core Diameter | 0.650" min |
| Color | Sky Gray, ANSI 70 |
| Minimum Mechanical Specifications | |
| Specified Mechanical Load (SML) (lbs) | 25,000 lb |
| Routine Tension Load (RTL) | 12,500 lb |
| Minimum Electrical Specifications | |
| Arcing Distance | 32" |
| Leakage Distance (inches) | 78" |
| Dry Flashover 60 Hz (kV RMS) | 355 kV |
| Wet Flashover 60 Hz (kV RMS) | 310 kV |
5. Construction
All parts of the fiberglass rod shall be completely covered with the same silicone rubber polymeric material as the weathersheds. The entire length of the polymeric covering, including the weathersheds, shall be one continuous, seamless piece of material. Weathersheds shall retain their original shape after severe deformation. Weathersheds shall shed water whether mounted horizontally or vertically and shall be self-cleaning with rain.
6. Corona Ring
All insulators shall have the ability to be easily retrofitted with a corona ring.
7. End Fittings
Each insulator shall be equipped with a Ball and Eye end fitting as specified for ANSI Class 52-5 insulators. End-fittings shall have sealant applied to protect against moisture penetration. End-fittings may be constructed of high strength aluminum alloy or malleable or ductile iron, galvanized per ASTM A-153, latest revision.
8. Identification
Each insulator shall be permanently marked with the manufacturer's name or logo and the date of manufacture. Each insulator shall be marked with the specified mechanical load rating (SML) with appropriate units. The markings shall be legible and durable. Packages containing multiple insulators shall be marked with the manufacturer's name, the type of insulator and the insulator part number.