Previous Code

Main Page

Original GO 95 Startup Page

Current GO 95 Startup Page

Change List for this Rule

Search Original GO 95 Page

Section Main Page

Next Code

 

Original General Order 95

 

Section IV

 

Strength Requirements for All Classes of Lines

 

49.3      Pins and Conductor Fastenings

 

A.       Material

 

(1)       Pins: Insulator pins shall be of galvanized steel, galvanized iron or other corrosion-resisting metal or of locust or other suitable wood.

 

(2)        Fastenings:  Conductor fastenings shall be of galvanized steel, galvanized iron or other corrosion-resisting metal.

 

B.       Size

 

(1)       Wood Pins: The minimum diameter of the shank shall not be less than 1 inches.

 

(2)       Metal Pins: The minimum diameter of the shank shall not be less than inches.

 

(3)       Fastenings and Tie Wires: Fastenings and tie wires shall have no sharp edges at points of contact with conductors, and shall be applied in such a manner as not to damage the conductor.  The materials and minimum sizes of tie wires for the various sizes and types of conductors shall be as shown in Table 7.  Flat tie wire having a cross-sectional area not less than that of round wire of the gage specified for tie wires may be used.

 

Table 7

Size and Material of Tie Wires

Line conductor

Tie Wire

Material

Size

Size

Material

Copper, bronze, copper-covered steel, or composition of any of them

6 AWG and smaller

Same as line conductor

Soft copper or annealed copper-covered steel

4 AWG

6 AWG

2 AWG and larger

4 AWG

Galvanized iron or galvanized steel

10 BWG and smaller

Same as line conductor

Soft or galvanized iron or galvanized steel

9 BWG

10 BWG

8 BWG

9 BWG

4 and 6 BWG

8 BWG

Aluminum or ACSR

4 AWG and smaller

Same as line conductor

Soft aluminum

2 AWG and larger

4 AWG

 

C.       Strength

 

Insulator pins and conductor fastenings shall be able to withstand the loads to which they may be subjected with safety factors at least equal to those specified in Rule 44.

 

Note A 1 by 9 inch locust pin will usually provide cantilever strength up to 1000 pounds tension in conductor with the conductor 3 inches above the crossarm and a safety factor of unity.

 

(1)       Longitudinal Loads Normally Balanced

 

a)       Insulator Pins: Where longitudinal loads are normally balanced, insulator pins which support conductors shall have sufficient to withstand, with a safety factor of not less than unity, a load at the conductor position as follows:

 

Pins supporting supply conductors--700 pounds

Pins supporting Class C conductors--400 pounds

 

b)       Conductor Fastenings: Where longitudinal loads are normally balanced, tie wires or other conductor fastenings shall be installed in such a manner that they will securely hold the line conductor to supporting insulators and will withstand without slipping of the conductors unbalanced pulls as follows:

 

Supply conductor fastenings

           

40% of the maximum working tensions but not more than 500 pounds

Class C conductor fastenings

 

15% of the maximum working tensions but not more than 300 pounds

 

Tie wires are not required on Class C conductors at point-type transpositions in Grade F construction.

 

(2)       Longitudinal Loads Normally Unbalanced:  At unbalanced corners and dead ends in Grades A, B or C construction, where the conductor tensions are held by cantilever strength in pin-type insulators and pins, double pins and insulators shall be used and each line conductor shall be tied or fastened to both insulators so as to prevent slipping of the conductor under the maximum working tensions with a safety factor of 2 under the temperature and loading conditions specified in Rule 43.

At changes in grade of construction and at end supports in Grades A or B construction where the conductors are not dead-ended and are supported on pin-type insulators, double insulators and pins with wires, or equivalent fastenings, will be considered as meeting the strength requirements of Rules 47.4 and 47.5 for conductor tensions up to 2000 pounds per conductor.

 

D.       Replacements (see Rule 44.2)