938326.1 Insulator 15kV Polymeric Deadend Suspension
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Revision 0
Jun 1, 2001
1. Scope
This specification applies to the District's requirements for composite, non-ceramic, polymeric suspension insulators for deadending conductors on a 12.47 Grd-Y/7.2kV electrical distribution system. The polymeric covering, including the weathersheds, shall be made of silicone rubber.
2. Material ID Number
This specification applies to the following District Material ID number: 938326
3. Reference Standard
Except as modified herein, these insulators shall meet the applicable requirements of the latest revision of ANSI C29.13.
4. Physical Characteristics
Section Length: 13.0" +/- 0.6" / Weathershed Diameter: 4.5" max. / Color: Sky Gray, ANSI No. 70 / Weight: 3 lbs max.
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. Insulators shall be similar in appearance to the insulator illustrated below in Fig. 1.
5. End-Fittings
Each insulator shall be equipped with an eye and clevis end-fitting conforming to ANSI C29.13. A 5/8" cotter bolt and stainless steel key shall be installed in each clevis fitting. End-fittings may be of high strength aluminum alloy or malleable or ductile iron, galvanized per ASTM A-153, latest revision.
6. Ratings
| Minimum Mechanical Strength Ratings | |
| Specified Mechanical Load (SML) (lbs) | 15,000 |
| Routine Test Load (RTL) (lbs) | 7,500 |
| Torsional Load (ft-lbs) | 35 |
| Minimum Electrical Specifications | |
| Leakage Distance (inches) | 14 |
| Dry Flashover 60 Hz (kV RMS) | 90 |
| Wet Flashover 60 Hz (kV RMS) | 65 |
| Positive Critical Impulse Flashover (kV peak) | 140 |
| RIV Test Voltage at 60 Hz (kV RMS to ground) | 15 |
| Max. RIV at 1000 kHz (micro volts) | 10 |
7. Markings
Each insulator shall be permanently marked with the manufacturer's name or logo and the date of manufacture. Each insulator shall also be marked with the specified mechanical load rating (SML) with appropriate units. The markings shall be legible and durable. Each carton of insulators shall be marked with the manufacturer's name, the type of insulator and the insulator part number.