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Original Version
Rule 42 - Table 3

Table 3: Grades of Construction

Class of Circuit Involved at Upper Level
Other Facilities Involved at Lower Level at Crossings, Conflicts or on Poles Jointly Used
Grade of Construction to Be Used at Upper Level
E or H
Class C Circuits
"A"
E, H or L
Major railways (steam, electric or other motive power, at crossings only)
"A"
E, H or L
Minor railways (at crossings only)
"B"
E or 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"
C
Class E or H Circuits
"A"
C
Major railways (at crossings 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 be Grade A, B or C
"F"

Note: Rule 57.8 specified bonding and grounding of sheath and messenger of supply cables. Table 3 revised March 30, 1968 by Decision No. 73813.

Strikeout and Underline Version
Rule 42 - Table 3

Table 3: Grades of Construction

Class of Circuit Involved at Upper Level
Other Facilities Involved at Lower Level at Crossings, Conflicts or on Poles Jointly Used
Grade of Construction to Be Used at Upper Level
E or H
Class C Circuits
"A"
E, H or L
Major railways (steam, electric or other motive power, at crossings only)
"A"
E, H or L
Minor railways (at crossings only)
"B"
E or 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"
C
Class E or H Circuits
"A"
C
Major railways (at crossings only)
"B"
C
Class L circuits of more than 750 Volts
"C"
C
Supply cables treated as specified in Rule 57.8
"F"
L or C
Under all conditions not required to be Grade A, B or CB
"FC"

Note: Rule 57.8 specified bonding and grounding of sheath and messenger of supply cables. Table 3 revised March 30, 1968 by Decision No. 73813.

Final Version
Rule 42 - Table 3

Table 3: Grades of Construction

Class of Circuit Involved at Upper Level
Other Facilities Involved at Lower Level at Crossings, Conflicts or on Poles Jointly Used
Grade of Construction to Be Used at Upper Level
E or H
Class C Circuits
"A"
E, H or L
Major railways (steam, electric or other motive power, at crossings only)
"A"
E, H or L
Minor railways (at crossings only)
"B"
E or H
Under all conditions not required to be Grade A
"B"
C
Class E or H Circuits
"A"
C
Major railways (at crossings only)
"B"
L or C
Under all conditions not required to be Grade A, or B
"C"