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 49.5–B
)
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 C29.1–1982)
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 SU–40.