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General Order 64-A

 

Section IV

 

Strength Requirements For All Classes Of Lines

 

Table 4

Minimum Safety Factors*

 

Element of Line

Grade of Construction

Grade A

Grade B

Grade C

Grade F

Conductors, splices and conductor fastenings (other than tie wires)

2

2

2

1

Pins

2

2

2

1

Pole line hardware

2

2

2

2

Line insulators (mechanical)

3

2

2

2

Guy Insulators (mechanical)

 

 

 

 

Interlocking

2

2

2

2

Noninterlocking

3

3

3

--------

Guys, except in light loading districts

2

2

2

1

Guys, in light loading rural districts

2

1

1

1

Messengers and span wires

2

2

2

2

Wood poles

4

3

2

1

Structural or tubular steel poles, towers, crossarms and steel members of foundations

1

1

1

--------

Foundations against uplift

1

1

1

--------

Foundations against depression

3

2

2

--------

Reinforced concrete poles

4

3

3

--------

Crossarms (wood)

2

2

2

1

 

*All tables covering detail specifications considered as meeting the safety factors prescribed herein.