Change List for this Rule


Original Version

Rule 86.8 (Table 16)

 

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 the 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 and 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.

Insulation 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 Standards (No. 41, March, 1930) of the American Institute of Electrical Engineers under the maximum mechanical loadings specified by this Order for the guy construction involved.

 

Table 16

Guy Insulator Flashover Voltage

Nominal voltage of circuits nearest point of attachments

Dry flashover voltage of insulators

0-7500 volts

15,000 volts

7500-17,500 volts

Double the circuit voltage

Over 17,500 volts

35,000 volts

 

Strikeout and Underline Version

Rule 86.8 (Table 16)

 

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 the 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 and Rule 49.5-B)

 

C.    Voltage Requirements

 

Insulatorsused 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.

Insulation 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 Standards (No. 41, March, 1930) of the American Institute of Electrical Engineers under the maximum mechanical loadings specified by this Order for the guy construction involved.

 

Table 16

Guy Insulator Flashover Voltage

Nominal voltage of circuits nearest point of attachments Circuit to Which Guy

Is in Proximity

Dry flashover voltage of insulators

0-7500 volts

15,000 volts

7501-17,500 volts

Double the circuit voltage

Over 17,5001 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


Final Version

Rule 86.8 (Table 16)

 

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 the 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 and 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.

Insulation 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 Standards (No. 41, March, 1930) of the American Institute of Electrical Engineers under the maximum mechanical loadings specified by this Order for the guy construction involved.

 

Table 16

Guy Insulator Flashover Voltage

Nominal voltage of Circuit to Which Guy

Is in Proximity

Dry flashover voltage of insulators

0-7500 volts

15,000 volts

7501-17,500 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