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

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Guys, except in light loading districts

2

2

2

1 ½

Guys, in light loading rural districts

2

1 ½

1 ½

1 ½

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 ½

1 ¼

1 ¼

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Foundations against uplift

1 ½

1 ½

1 ½

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Foundations against depression

3

2

2

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Reinforced concrete poles

4

3

3

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Crossarms (wood)

2

2

2

1