E1109 go95 rule 54.10

Original Version
Rule 54.10

(1) The following rules cover requirements for 0-750 volt multi conductor cable having a bare neutral and are supplemental to the other rules of this order.

(2) The term "messenger" as defined in Rule 21.9 of this order when used in Rule 54.10 of this order includes the bare neutral conductor whenever such conductor serves both as a conductor and also as a principal supporting member of the cable.

(1) Clearance From Poles: Multiconductor cables having a bare neutral may have clearances less than 15 inches from center line and three inches from surface of pole, as specified in Table 1, Column D, Cases 8 and 9, respectively, but shall have a clearance of not less than 2i inches from the surface of pole and shall be supported on an insulator.

(2) Between Conductors In Cables: No specified clearance is required between the insulated phase conductors and the bare neutral (see Rule 57.4-C).

(3) Conductor Arrangement: In parallel construction, cables shall not be attached to more than one side of a pole (there being four sides).

(4) At Cable Terminations: The clearances required by Rule 54.10-E of this order between a cable and unprotected line conductors shall not be held to apply between a cable (and its grounded messenger) and unprotected conductors of the same circuit on poles where unprotected conductors enter (or leave) a cable. On such poles no grounded messenger shall be less than 15 inches from centerline of the pole.

(5) Dead-end Construction: On poles with the messenger dead-ended in more than one direction, the grounded messenger or insulated phase conductors of the cable shall not be attached to more than two sides of the pole and shall be not less than 2 � inches from the surface of the pole. On the climbing space side, service drops shall not be supported within 15 inches of the surface of the pole. The climbing space shall be determined by Rule 54.10-F(3) of this order.

(1) Insulation: The phase conductors including jumper connections shall be covered with an insulation suitable for the voltage involved and shall conform with the standards established by the Insulated Power Cable Engineers Association, in Part 1, Section 7.3 of "Thermoplastic-Insulated Wire and Cable for the Transmission and Distribution of Electrical Energy", Insulated Power Cable Engineers Association Standard S-61-402, approved January 12, 1961, and National Electrical Manufacturers Association Standard WC5-1961, approved May 15, 1961.

(2) Messenger: Where cables are not maintained from a cable chair, the addition of the 200 pounds of vertical load specified in Rule 49.7-C may be reduced to 50 pounds to allow for the load imposed by workmen on ladders.

A vertical separation between individual conductors when supported in individual clevises or a multiconductor rack shall be not less than 6 inches.

When attached to poles or wood crossarms at less than 15 inches from center line of pole, bare neutral multiconductor cable shall be not less than 6 feet vertically above or 6 feet vertically below unprotected conductors except as modified below:

(1) With Guard Arm Below Conductors Of 0-750 Volts: Where a guard arm is placed above bare neutral multiconductor cable in accordance with the provisions of Rule 57.7, the clearance of 6 feet may be reduced to not less than 4 feet below unprotected conductors of 0-750 volts.

(2) Above Conductors Of 0-750 Volts More Than 15 Inches From Center Line Of Pole: The vertical clearance between protected conductors of 0-750 volts attached at more than 15 inches from the center line of pole and bare neutral multiconductor cable above may be less than 6 feet but not less than 4 feet and no guard arm is required.

(3) Under A Transformer No guard arm will be required over bare neutral multiconductor cable attached to the surface of a pole directly below a transformer installation provided that at that level all attachments to the pole shall be approximately in the vertical plane through the center lines of pole and transformer installation and no cable so attached makes an angle greater than 60 degrees with that plane. The cable so supported shall have a vertical clearance of not less than 48 inches below the level of conductors on the hanger arm; a vertical clearance not less than as specified in Rule 54.4-C6 below the lowest point of the drip loop of primary leads to the transformer; and a vertical clearance of not less than 10 inches below the lowest part of the transformer case or hangers.

(4) Related Bare Neutral Multiconductor Cable And Crossarm: Where bare neutral multiconductor cable is connected to conductors supported on a crossarm on the same pole, the vertical clearance between the level of conductors of 0-750 volts on the crossarm and the bare neutral multiconductor cable shall be not less than 2 feet and climbing space shall be maintained in the same quadrant on the same side of pole through both conductor levels in accordance with climbing space requirements in Rules 54.7 and 54.10-F. This provision is not applicable where the crossarm is a combination arm.

(1) A climbing space shall be maintained through the level of conductors supported in bare neutral multiconductor cable construction and for a vertical distance of not less than 4 feet above and below such cable. The position of the climbing space through the levels of conductors in such cable construction shall be related to climbing space for conductor levels above and below the cable in accordance with Rules 54.7-A and 93. The depth of the climbing space shall be measured from the center line of the pole.

(2) The dimensions of the climbing space shall be 30 inches square, and shall be provided on one side of the pole with the extremities of such width equidistant from the center line of pole. On poles on which transformers are pole bolted in line with primary conductors, a 30inch square climbing space shall be provided.

(3) On poles with the messenger dead-ended and on corner poles, a 30-inch climbing space shall be provided in one quadrant or on one side of the pole. Suitably protected vertical runs or risers and ground wires attached to the surface of poles, and guys, are allowed in climbing spaces provided that no more than one guy or one vertical riser, run or ground wire are installed in any 4-foot vertical section of climbing space. The terminals or terminal fittings of risers or runs shall not be installed within climbing spaces.

Phase conductors of service drops taken from bare neutral multiconductor cables shall have insulation equivalent to that specified in Rule 54.10-C1. Where service drops are supported on ACSR or aluminum messenger, the messenger shall be protected against abrasion. Services supported on the messenger shall be attached not less than 15 inches from the surface of the pole.

In the application of Rule 57.5, where cables are not maintained from a cable chair, the addition of 200 pounds vertical load, specified in Rule 49.7-C may be reduced to 50 pounds to allow for the load imposed by workmen on ladders.

(1) The following rules cover requirements for 0-750 volt multi conductor cable having a bare neutral and are supplemental to the other rules of this order.

(2) Between Conductors In Cables: No specified clearance is required between the insulated phase conductors and the bare neutral (see Rule 57.4-C).

(3) Conductor Arrangement: In parallel construction, cables shall not be attached to more than one side of a pole (there being four sides).

A vertical separation between individual conductors when supported in individual clevises or a multiconductor rack shall be not less than 6 inches.

Messengers may be extended in bare neutral multiconductor cable construction provided the messenger is sectionalized as a guy.

In the application of Rule 57.9 the 200-pound additional vertical loading specified for a man and cable chair may be reduced to 50 pounds where the cable is not maintained from a cable chair.