Change List for this Rule

 

General Order 95

 

Section V

 

Detailed Construction Requirements for Supply Lines
(Class H, L and T Circuits)

 

56.4    Clearances

 

A.    Above Ground

 

(1)    Over, Across or Along Public Thoroughfares:

 

a)    Guys over or across public thoroughfares in urban districts  shall have a clearance of not less than 18 feet above ground ( Table 1, Case 3, Column A ).

 

EXCEPTIONS:

 

1)    A clearance of not less than 16 feet is permitted for the portions of guys over that part of the public thoroughfares which is an entrance to or exit from industrial or commercial premises.

 

2)    A clearance of not less than 14 feet is permitted for the portions of guys over that part of the public thoroughfare which is an entrance to or exit from private residential premises.

 

b)    Overhead guys along public thoroughfares may have clearances, above ground which is not normally accessible to vehicles, less than as specified in Table 1, Column A, Cases 3 and 4 (18 feet and 15 feet respectively).

 

1)    Sections of such guys between insulators shall have a  clearance of not less than 8 feet above the ground.

 

2)    Sections of such guys between insulators and poles shall have a clearance of not less than 8 feet above the ground.

 

3)    Such guys without insulators shall not be less than 8 feet above the ground.

 

Note:    Revised January 21, 1992, by Resolution SU10 and October 9, 1996 by Resolution SU40.

 

(2)    Over Private Property: Those portions of guys over private roadways or areas normally accessible to vehicles may have a clearance above ground less than 18 feet (Table 1, Case 3, Column A ) but not less than 16 feet in rural districts and not less than 14 feet in urban districts.

 

(3)    Over Swimming Pools: (See Rule 54.4A3 and Figure 541 )

 

Note:    Added January 2, 1962 by Resolution No. E1109, and revised November 21, 1990 by Resolution SU6.

 

B.    Above Railways and Trolley Lines

 

(1)    Which Transport Freight Cars: The clearance specified in Table 1, Case 1, Column A (25 feet) is based upon the maximum height of standard freight cars, 15 feet 6 in. from top of rail to top of running board. This clearance shall in no case be reduced more than 5% because of temperature, wind or mechanical loading.

 

(2)    Operated by Overhead Trolley: The clearance of 26 feet specified in Table 1, Case 2, Column A is based upon a trolley pole throw of 26 feet. Guys and span wires may have clearances of less than the trolley throw distance (26 feet) above the running surfaces, top of rail or surface of street, used by trolley cars or coaches provided the guys and span wires are not less than 4 feet above the trolley contact conductors and are encased in wood boxing or moulding 7/8 inch or more in thickness for distances of at least 2 feet horizontally from the vertical plane through each trolley contact conductor.

 

C.    From Conductors

 

(1)    Crossing in Spans: Vertical clearances at points of crossing not less than as specified in Table 2, Case 1 , and radial clearances not less than as specified in Table 2, Case 18 , shall be maintained between guys or span wires and conductors supported on other poles.

 

(2)    On Colinear Lines: The radial clearances between guys on a pole line and conductors on a colinear pole line shall not be less than as specified in Table 2, Case 18 . Vertical clearances not less than as specified in Table 2, Case 1 , shall also be maintained at points of crossing between guys on a pole line and conductors supported on other poles of a colinear pole line.

 

Note:    Revised January 21, 1992, by Resolution SU10 and October 9, 1996 by Resolution SU40.

 

(3)    Parallel on Same Poles: The radial clearances between guys and conductors which are approximately parallel and supported by the same poles shall not be less than as specified in Table 2, Case 18 (see Figure 561 ).

 

Note:    Revised January 21, 1992, by Resolution SU10.

 

(4)    Passing on Same Poles: The radial clearances between guys and conductors supported by or attached to the same poles or crossarms shall not be less than as specified in Table 2, Case 19 .

 

EXCEPTION:    The clearance between guys and communication messenger and/or cable attached directly to the surface of a pole may be less than the 3 inches specified in Table 2, Case 19, Column C provided:

 

a)    A suitable guard is placed on the messenger and/or cable or guy wire to prevent physical contact and resultant mechanical damage; and

 

b)    The guy is not a guy in proximity; or

 

c)    An insulator is placed in the guy above the communication messenger and/or cable at a vertical distance of not less than 8 feet below the supply conductor level, (see Figure 562 A ); or

 

d)    All parts of the guy within a radial distance of 6 feet from the face of pole are 6 feet or more below the 0 - 750 volt supply conductors supported on the same pole (see Figure 562B ); or

 

e)    The guy is attached to a pole which supports supply conductors that are 6 feet or more above the communication messenger and/or cable, provided:

 

1)    An insulator is placed in the guy above the communication messenger and/or cable at a distance of 6 feet or more horizontally from the pole and not less than one foot below the level of the lowest supply conductor (see Figure 562 C ); or

 

2)    An insulator is placed in the guy 3 to 6 inches above the messenger and/or cable. In lieu of a porcelain insulator a suitable fiberglass insulating rod or equivalent that meets the requirements of Rule 56.8 and extends 6 inches or more above and below the communication messenger and/or cable may be used (see Figure 562 D ).

 

Note:    Revised February 14, 1968 by Decision No. 73722; and January 21, 1992, by Resolution SU10.

 

D.    From Guys or Span Wires

 

(1)    Crossing in Spans: Vertical clearances at points of crossing not less than 18 inches (Table 2, Case 1, Column A ) and radial clearances of not less than 12 inches shall be maintained between guys or span wires and other guys or span wires which are not attached to the same poles.

 

(2)    Passing and Attached to Same Pole: The radial clearance between different guys, different span wires, or different guys and span wires, attached to the same pole shall not be less than 3 inches.

 

(3)    Approximately Parallel and Attached to Same Poles:

 

a)    Overhead Guys or Span Wires: Where two or more overhead guys or two or more span wires are approximately parallel and attached to the same poles, and either or both poles support supply conductors:

 

1)    Such guys or span wires shall have a vertical separation of at least 1 foot between the points of attachment on the pole, or poles, which support the supply conductors.

 

2)    In cases where such separation is not practicable, other means to insure the effectiveness of the guy or span wire insulators shall be employed, but in no case shall the distance between any guy or span wire and the surface of the insulator in any other guy or span wire be less than 3 inches, measured perpendicularly at the insulator.

 

3)    This rule shall not prohibit the contact of such guys or span wires to the same shims and shall not apply to guys or span wires acting in different directions nor to guys or span wires in which insulators are not required.

 

4)    Where two guys are installed in climbing space, also see Rule 54.7A3 .

 

b)    Anchor Guys: Where two or more guys attached to a pole supporting supply conductors are attached to the same grounded anchor, either directly or through the medium of a stub:

 

1)    They shall be separated at the pole by a vertical distance of at least 1 foot, provided any guy wire shall not be less than 3 inches from the surface of the insulator in any other guy.

 

2)    n lieu of securing this 3 minimum separation by means of the 1 foot minimum separation of guy attachments at the pole, it shall be afforded by separation of the grounded anchors or by other practicable means which shall insure the minimum clearance of 3 inches.

 

3)    The provisions of this rule do not apply to guys which act in different directions from the pole or to guys attached to grounded metal structures or to guys which do not require insulators.

 

4)    Where two guys are installed in climbing space, also see Rule 54.7A3 .

 

Note:    Revised January 21, 1992, by Resolution SU10.

 

E.    From Poles

Where passing guys are less than 15 inches from surface of pole and less than 8 feet below supply conductors of less than 22,500 volts supported on the same pole, such guys shall be sectionalized, in addition to the normal sectionalization required by
Rule 56.6 , by means of insulators in accordance with Rule 56.6A as though attached to the pole or structure.

 

Note:    Revised March 29, 1966 by Decision No. 70489 and August 9, 1966 by Decision No. 71094.

 

F.    From Transformer Cases

All portions of guys 6 inches or more from the surface of poles or crossarms, at the guys point of attachment, shall not be less than 4 inches from transformer cases and hangers. Portions of guys within 6 inches of the surface of poles or crossarms to which they are attached shall not be less than 11/2 inches from transformer cases and hangers.

 

Note:    Revised January 21, 1992, by Resolution SU10.

 

G.    Above Buildings

The minimum vertical clearance of 8 feet specified for guys above buildings (
Table 1, Case 6, Column A ) may be reduced over roofs of 3/8 pitch (37 degrees from the horizontal) or greater to a clearance of not less than 2 feet.