Change List for this Rule


General Order 95


Section VIII


Detailed Construction Requirements for Communication Lines
(Class C Circuits)


86.8    Guy Insulators


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


A.    Material

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


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


C.    Voltage Requirements

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

Insulators used in guys on communication lines shall have a dry flashover voltage not less than as specified in
Table 16 when tested in accordance with the American National Standard (ANSI C29.11982) under the maximum mechanical loadings specified by this order for the guy construction involved.


Table 16:     Guy Insulator Flashover Voltages


Nominal Voltage of Circuits to Which Guy is in Proximity

Dry Flashover Voltage of Insulators

0 - 7,500 volts

15,000 volts

7,501 - 17,500 volts

Double the circuit voltage

17,501 - 22,500 volts

35,000 volts

22,501 - 35,500 volts

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 and October 9, 1996 by Resolution SU40.