Original Version
Rule 42
42 Grades of Construction
For all classes of lines, the relative order of grades is “A,” “B,” “C” and “F,” grade “A” being the highest.
Supply and communication lines, where not involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as follows:
Class H supply- - - - - - - - - - - - - - - Grade B
Class L supply- - - - - - - - - - - - - - - Grade C
Class C communication- - - - - - - - - Grade F
Supply and communication lines, where involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as specified in Table 3.
Table 3 Grades of Construction |
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| 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 circuit |
“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” |
Note: Rule 57.8 specifies bonding and grounding of sheath and messenger of supply cables.
Strikeout and Underline Version
Rule 42
42 Grades of Construction
For all classes of lines, the relative order of grades is “A,” “B,” “C” and “F,” grade “A” being the highest. Supply and communication lines, where not involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as follows:
Class E supply- - - - - - - - - - - - - - - Grade B
Class H supply- - - - - - - - - - - - - - - Grade B
Class L supply- - - - - - - - - - - - - - - Grade C
Class C communication- - - - - - - - - Grade F
Supply and communication lines, where involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as specified in Table 3.
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 |
| E or H |
Major Class C Circuits |
“A” |
| E, H or L |
Major railways (steam, electric or other motive power at crossing only) |
“A” |
| E, H or L |
Minor railways (at crossing 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” |
| E or 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 E or H circuit |
“A” |
| Minor Class C |
Class E or 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” |
Note: Rule 57.8 specifies bonding and grounding of sheath and messenger of supply cables.
Final Version
Rule 42
42 Grades of Construction
For all classes of lines, the relative order of grades is “A,” “B,” “C” and “F,” grade “A” being the highest. Supply and communication lines, where not involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as follows:
Class E supply- - - - - - - - - - - - - - - Grade B
Class H supply- - - - - - - - - - - - - - - Grade B
Class L supply- - - - - - - - - - - - - - - Grade C
Class C communication- - - - - - - - - Grade F
Supply and communication lines, where involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as specified in Table 3.
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 |
| E or H |
Major Class C Circuits |
“A” |
| E, H or L |
Major railways (steam, electric or other motive power at crossing only) |
“A” |
| E, H or L |
Minor railways (at crossing 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” |
| E or 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 E or H circuit |
“A” |
| Minor Class C |
Class E or 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” |
Note: Rule 57.8 specifies bonding and grounding of sheath and messenger of supply cables.