Change List for this Rule

 

Original Version

Rule 44.1-Table 4

 

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

1

1

Pole line hardware

 2

 2

2

2

Line insulators (mechanical)

3

2

2

2

Guy Insulators (mechanical)

Interlocking

 2

2

2

2

Noninterlocking wood

 3

3

3

--

Noninterlocking glass fiber

3

2(a)

2(b)

--

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

Metallic Service and Meter Poles

-

2

2

--

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

1 ½ (c)

1 ¼ (c)

1 ¼(c)

--

Foundations against uplift

1 ½

1 ½

1 ½

--

Foundations against depression

3

2

2

--

Reinforced concrete poles

4

3

3

--

Crossarms (wood)

2

2

2

1

Prestressed Concrete Poles, Structures, and Crossarms

1.8

1.5

1.5

--

 

(a)    Insulators are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement or other conditions subsequent to installation) to less than 95 percent of the safety factor specified in Rule 44.1.

 

(b)    Insulator are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement, or other conditions subsequent to installation) to less than 75 percent of the safety factor specified in Rule 44.1.

 

(c)    For aluminum members subject to tension caused by one or more estimated loads and where the critical load combination for the tension member would not endanger adjacent compression members, the factor of safety on ultimate tension shall be 2 for Grade “A” construction and 1.67 for Grades “B” and “C” construction

 

Strikeout and Underline Version

Rule 44.1-Table 4

 

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

1

1

Pole line hardware

 2

 2

2

2

Line insulators (mechanical)

3

2

2

2

Guy Insulators (mechanical)

Interlocking

 2

2

2

2

Noninterlocking wood

 3

3

3

--

Noninterlocking glass fiber

3

2(a)

2(b)

--

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

Foundations against uplift

1 ½

1 ½

1 ½

--

Foundations against depression

3

2

2

--

Wood poles

4

3

2

1

Metallic Service and Meter Poles

-

2

2

--

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

1 ½ (c)

1 ¼ (c)

1 ¼(c)

--

Foundations against uplift

1 ½

1 ½

1 ½

--

Foundations against depression

3

2

2

--

Reinforced concrete poles

4

3

3

--

Crossarms (wood)

2

2

2

1

Prestressed Concrete Poles, Structures, and Crossarms

1.8

1.5

1.5

--

Poles Towers and Structures

Wood poles

4

3

2

1

Metallic service and meter poles

-

2

2

-

Structural or tubular metallic poles, towers, structures, crossarms and metallic members of foundations

1.5(c)

1.25(c)

1.25(c)

-

Reinforced concrete poles

4

3

3

-

Prestressed concrete poles, structures and crossarms

1.8

1.5

1.5

-

Other structural materials

1.5

1.25

1.25

-

Crossarms

 

 

 

 

Wood

2

2

2

1

Steel

1.5

1.25

-

-

Concrete

1.8

1.5

1.5

-

Other structural material

1.5

1.25

1.25

-

 

(a)    Insulators are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement or other conditions subsequent to installation) to less than 95 percent of the safety factor specified in Rule 44.1.

 

(b)    Insulator are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement, or other conditions subsequent to installation) to less than 75 percent of the safety factor specified in Rule 44.1.

 

(c)    For aluminum members subject to tension caused by one or more estimated loads and where the critical load combination for the tension member would not endanger adjacent compression members, the factor of safety on ultimate tension shall be 2 for Grade “A” construction and 1.67 for Grades “B” and “C” construction

 

Final Version

Rule 44.1-Table 4

 

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

1

1

Pole line hardware

 2

 2

2

2

Line insulators (mechanical)

3

2

2

2

Guy Insulators (mechanical)

Interlocking

 2

2

2

2

Noninterlocking wood

 3

3

3

--

Noninterlocking glass fiber

3

2(a)

2(b)

--

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

Foundations against uplift

1 ½

1 ½

1 ½

--

Foundations against depression

3

2

2

--

Poles Towers and Structures

Wood poles

4

3

2

1

Metallic service and meter poles

-

2

2

-

Structural or tubular metallic poles, towers, structures, crossarms and metallic members of foundations

1.5(c)

1.25(c)

1.25(c)

-

Reinforced concrete poles

4

3

3

-

Prestressed concrete poles, structures and crossarms

1.8

1.5

1.5

-

Other structural materials

1.5

1.25

1.25

-

Crossarms

 

 

 

 

Wood

2

2

2

1

Steel

1.5

1.25

-

-

Concrete

1.8

1.5

1.5

-

Other structural material

1.5

1.25

1.25

-

 

(a)    Insulators are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement or other conditions subsequent to installation) to less than 95 percent of the safety factor specified in Rule 44.1.

 

(b)    Insulator are to be replaced before safety factors have been reduced (due to deterioration or changes in construction, arrangement, or other conditions subsequent to installation) to less than 75 percent of the safety factor specified in Rule 44.1

 

(c)    For aluminum members subject to tension caused by one or more estimated loads and where the critical load combination for the tension member would not endanger adjacent compression members, the factor of safety on ultimate tension shall be 2 for Grade “A” construction and 1.67 for Grades “B” and “C” construction