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General Order 64-A

 

Section IV

 

Strength Requirements For All Classes Of Lines

 

Table 3

Grades of Construction

 

Class of Circuits involved at upper level

Other facilities at lower level at crossing, conflicts or on poles jointly used

Grade of construction to be used at upper level

H

Major Class C Circuits

"A"

H or L

Major railways (steam, electric or other motive power at crossing only)

"A"

H or L

Minor railways (at crossing only)

"B"

H

Under all conditions not required to be grade A except supply cables treated as specified in Rule 57.8

"B"

L

Under all conditions not required to be Grade A or B

"C"

Supply cables treated as specified in Rule 57.8

Under all conditions

"C"

Major Class C

Class H circuits

"A"

Minor Class C

Class H circuits

"B"

C

Major railways (at crossing only)

"B"

C

Class L circuits of more than 750 volts

"C"

C

Supply cables treated as specified in Rule 57.8

"F"

C

Under all conditions not required to Grade A, B, or C

"F"