Change List for this Rule

 

General Order 95

 

Section V

 

Detailed Construction Requirements for Supply Lines
(Class H, L and T Circuits)

 

56.8    Guy Insulators

 

Insulators which sectionalize guys shall conform to the following specifications based on the highest voltage carried at the level on the pole, tower, structure or crossarm nearest which the guy is attached and also based on the voltage of higher voltage circuits through which the guy passes.

 

A.    Material

Insulators used in guys on supply lines shall be porcelain, glass, fiberglass or other suitable material.

 

Note:    Revised January 21, 1992, by Resolution SU–10.

 

B.    Strength (See Rule 44 , Table 4 and Rule 49.5–B )

 

C.    Voltage Requirements

Insulators used in guys on supply lines shall be so designed that their dry flashover voltage is not more than 75% of the puncture voltage at operating frequencies.

Insulators used in guys on supply lines shall have a dry flashover voltage not less than as specified in
Table 13 when tested in accordance with the American National Standard (ANSI C29.1–1982) under the maximum mechanical loadings specified by this Order for the guy construction involved.

 

Note:    Revised January 21, 1992, by Resolution SU–10.

 

Table 13: Guy Insulator Flashover Voltages

Nominal Voltage of Circuit to Which Guy Is in Proximity (Volts)

Dry Flashover Voltageof Insulators

0 - 7,500

15,000 Volts

7,501 - 17,500

Double the Circuit Voltage

17,500 - 22,500

35,000 Volts

22,501 - 35,500

Double the Circuit Voltage

 

Note:    To meet dry flashover requirements, use of multiple insulators in series is permissible.

 

Note:    Revised November 20, 1979 by Decision No. 91030.