General Order 64-A

Section IX

Joint Poles Or Poles Jointly Used

92.1    Clearances.

A.    From Center Line of Poles.

Where conductors are supported on crossarms on jointly used poles, a minimum horizontal clearance of 15 inches shall be maintained.  (See Table 1, Case 7.)

Supply cables as treated in Rule 57.8 and communication cables may be attached directly to one side of jointly used poles.

B.    Rack Construction.

Where rack construction is used on jointly used poles, the following minimum vertical clearances shall apply:

C.    Cable Construction.  (See App. G, Fig. 89.)

Where cables are attached directly to jointly used poles the following minimum vertical clearances between such cables and cables or conductors of other classifications shall apply:

D.    Paired Conductors.

One Paired Communication Conductor may be carried on brackets on poles which support supply conductors, provided the poles are set on private property and a minimum vertical separation of 5 feet is maintained and both classifications of circuits are used for service to the same party.

Paired wire line extensions from cable terminals may be temporarily attached directly to poles by means of brackets at a distance not less than 5 feet below supply conductors of 0-750 volts, without guard arm, leaving one side of poles free for climbing.  Such attachment may have also be made not less than 48 inches above supply conductors of 0-750 volts.  (See App. G, Fig. 88.)

E.    From Non-Energized Equipment.

The 4 foot vertical minimum separation with guard arm, between supply and communication conductors, may be reduced to 40 inches with guard arm where applied to separation between conductors of 0-750 volts of one classification and normally non-energized equipment of the other classification provided the latter is not installed within the climbing space.

F.    Police And Fire Alarm Circuits.

Police and fire alarm circuits which are permitted to occupy the position between supply circuits of 0-750 volts (rack construction excepted) and other communication circuits with a minimum vertical clearance of 2 feet from each of such circuits provided the conductors of such police and fire alarm circuits are protected with a covering equal to double braid weatherproofing and are carried at a minimum horizontal distance of 25 inches from the center line of the supporting pole.  This does not prohibit the carrying of these conductors at this location in messenger ring construction, provided the messenger is insulated in accordance with guy requirements and no part of the messenger is grounded throughout its length.

G.    From Span Wires of Class T Circuits.

Span wires and conductors (including cables) shall maintain the clearances specified in Table 2, Case 8 to 13, inclusive, where the span sire insulation can not be maintained due to climatic or other conditions.

H.    From Drip Loops.

The lowest point of the drip loop from the terminal or end of a conduit run shall a minimum vertical separation of one foot from the nearest supply conductor level below it.

I.    From Cable Terminals or Boxes.

A metal communication terminal or box shall not be placed less than 6 feet vertically below supply conductors, excepting that if a suitable guard arm is placed over the box or terminal the clearance may be reduced to 4 feet.

It is recommended that where the communication conductors are in cable attached directly to one side of the pole, the terminal or box be placed below the cable arm or cable guard arm.

J.    From Street Lighting Equipment.

Street lighting equipment, including the supporting rods, braces and guys, shall not be less than one foot above or below all conductors of open wire and not less than one foot above or two feet below all circuits carried in cables.

K.    From Transformers on Platforms.

Where transformers are installed on racks having a continuous flooring that affords adequate protection to equipment below, cables may be installed at a minimum vertical distance of 12 inches below transformer cases provided the specified ground clearance requirements are maintained.