Change List for this Rule


General Order 95


Section V


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

58.4    Traffic Signals

Traffic signals supported on overhead suspensions shall be treated as specified in the following rules:


A.    Messenger and Span Wire Clearances

The suspension messenger or span wire of all traffic signals shall be installed to afford the clearances prescribed for span wires in
Table 1, Column A , and Table 2, Column A .


B.    Lead Wires

Lead wires of 0 - 750 volts to traffic signals supported on messengers may be less than the clearances above ground specified in
Table 1, Column D, Cases 2 and 3 provided they are maintained at a clearance above ground as specified in Table 1, Column A, Cases 2 and 3 for the messenger on which they are supported.


C.    Clearance above Thoroughfares

Traffic signals supported by span wires and supplied from circuits of 0 - 750 volts shall have a clearance of not less than 14 feet vertically above thoroughfares over which they are suspended (see
Figure 58–4 ) except that where any thoroughfare is used by railroads, street railways, trolley coach lines and double deck motor coaches, clearance not less than the following shall be maintained:


Conveyance Using Thoroughfare

Minimum Clearance of Signal above Thoroughfare

Street railways and coach lines operated by overhead trolley

Height of trolley conductor plus 1 foot (a)

Railroads which transport freight cars

25 Feet (b)

Double deck motor coaches

18 Feet


(a)    May be reduced to 14 feet if signal is more than 8 1/2 feet from nearest trolley contact conductor and if signal is maintained not less than 1 foot radially from trolley span wires.


(b)    May be reduced to 14 feet if signal is more than 8 1/2 feet from centerline of track.


Traffic signals supplied directly (without protective transformers) from circuits classified in excess of 750 volts shall be installed with clearances as prescribed for street lighting equipment.


Note:    Revised January 19, 1994 by Resolution SU–25. (Formerly Rule 58.1)