Rule 21.9

21.9    Lines mean those conductors together with their supporting poles or structures and appurtenances which are located outside of buildings.

A.    Conflicting Lines (lines in conflict or conflicts) mean lines so situated with respect to each other (except at crossings) that the overturning of one line will result in contact of its poles or conductors with the poles or conductors of the second line, assuming no conductors are broken in either line; except that lines on opposite sides of a thoroughfare are not considered as conflicting if separated by a distance not less than 60 percent of the height of the higher pole line above the ground line and in no case less than 20 feet (see Appendix G, Figure 1 ).

B.    Colinear Lines mean conflicting lines so situated that one line is wholly or partly over the other line, often called “overbuild”.

Conflicting lines not “overbuilds” but separated a horizontal distance of less than the required pin spacing of the highest voltage circuit involved

Conflicting lines not “overbuilds” but separated a horizontal distance of less than one foot, regardless of pin spacing (see Appendix G, Figs 2 and 3 ).

Note:    For the purpose of measurement, the horizontal distance between the conflicting lines shall be that distance measured horizontally between vertical planes passing through the adjacent extremities of the conflicting lines.

C.    Tower Lines (Class E, H, L and T) mean supply lines, with supporting metal structures having an outside dimension of more than 4 feet measured either along or across the line in a horizontal plane at the ground level. Metal supporting structures, such as “A” frames or “H” structures, having a dimension from outside of one support to outside of another support greater than 4 feet at the ground level will be classified as towers.

Guyed V–type or Y–type metal structures will be classified as towers.

Note:    Metal structures having maximum outside dimensions of 4 feet or less, measured along and across the line of a horizontal plane at the ground level, will be classified as poles under supply lines.

D.    Overhead Line Structures are the poles, towers, or structures located outside of buildings and which support circuits and their related conductors and equipment.

Strikeout and Underline Version

Rule 21.9

21.9    Lines mean those conductors together with their supporting poles or structures and appurtenances which are located outside of buildings.

A.    Conflicting Lines (lines in conflict or conflicts) mean lines so situated with respect to each other (except at crossings) that the overturning of one line will result in contact of its poles or conductors with the poles or conductors of the second line, assuming no conductors are broken in either line; except that lines on opposite sides of a thoroughfare are not considered as conflicting if separated by a distance not less than 60 percent of the height of the higher pole line above the ground line and in no case less than 20 feet (see Appendix G, Figure 1 ).

B.    Colinear Lines mean conflicting lines so situated that one line is wholly or partly over the other line, often called “overbuild”.

Conflicting lines not “overbuilds” but separated a horizontal distance of less than the required pin spacing of the highest voltage circuit involved

Conflicting lines not “overbuilds” but separated a horizontal distance of less than one foot, regardless of pin spacing (see Appendix G, Figs 2 and 3 ).

Note:    For the purpose of measurement, the horizontal distance between the conflicting lines shall be that distance measured horizontally between vertical planes passing through the adjacent extremities of the conflicting lines.

C.    Tower Lines (Class E, H, L and T) mean supply lines, with supporting metal structures having an outside dimension of more than 4 feet measured either along or across the line in a horizontal plane at the ground level. Metal supporting structures, such as “A” frames or “H” structures, having a dimension from outside of one support to outside of another support greater than 4 feet at the ground level will be classified as towers.

Guyed V–type or Y–type metal structures will be classified as towers.

Note:    Metal structures having maximum outside dimensions of 4 feet or less, measured along and across the line of a horizontal plane at the ground level, will be classified as poles under supply lines.

D.    Overhead Line Structures are the poles, towers, or structures located outside of buildings and which support circuits and their related conductors and equipment.

21.7    Lead Wires mean those conductors which are sometimes termed “jumpers”, “bridle wires”, “transposition wires”, or “taps”, and which are used on an overhead line structure for connecting the line conductors to equipment and apparatus or other line conductors on the same overhead line structure.

Final Version

Rule 21.9

21.9    Lead Wires mean those conductors which are sometimes termed “jumpers”, “bridle wires”, “transposition wires”, or “taps”, and which are used on an overhead line structure for connecting the line conductors to equipment and apparatus or other line conductors on the same overhead line structure.