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.