GO 64-A, Supplement 2

Supplement Number 2

A. Voltage in Excess of 750.

All crossarms supporting only conductors carrying in excess of 750 volts shall be painted a bright yellow color, or in lieu thereof there shall be placed on the face and back of each of each cross arm a sign showing in white letters, not less than 3 inches in height on a green or black background, the words “High Voltage.” The provisions of this paragraph shall be held not to apply to crossarms supporting supply conductors in excess of 17,000 volts which are situated in rural districts.

B. Combination Arms.

Where supply circuits of 0-750 volts are carried on the same crossarm with circuits of 750-7500 volts, the sign shall be placed on the crossarm under the circuit of 750-7500 volts, or that end of the crossarm carrying circuits of 750-7500 volts shall be painted yellow from the center line of pole.

Where the crossarm carries circuits of 750-7500 volts on both ends, 2 signs shall be used on both face and back of the cross arm or the sign may be divided, the word “High” being placed on one end and “Voltage” on the other to show that the entire cross arm carries high voltage circuits. This rule does not apply to systems where circuits of 0-750 volts and circuits of 750-7500 volts are not usually carried on the same crossarm.

(1) Heel Arms: Where high voltage signs are used as the method of marking, they are not required on face of transformer heel arm.

(2) Metal Poles, Towers and Structures: Where metal poles, towers or structures which support conductors are marked as provided in Rules 51.6 and 68, such marking shall be deemed sufficient and no marking of the crossarm will be required.

D. Designation Of Common Neutral.

In common primary and secondary grounded neutral systems, where the common neutral line conductor is installed in a primary pin position, it shall be designated by an approved noncorrosive metal tag having a minimum diameter of not less than one inch upon which shall be permanently imprinted o letters "CN" not less than five-sixteenths (5/16) inch in height. Said tag shall be attached securely to and maintained on the common neutral conductor at each pin position of line arm and buck arm at a distance not more than twelve (12) inches from the face of the cross arm on the climbing side of each pole and so installed as to be clearly visible at all times.

(1) All crossarms supporting only conductors carrying in excess of 750 volts shall be painted a bright yellow color, or in lieu thereof there shall be placed on the face and back of each of each cross arm a sign showing in white letters, not less than 3 inches in height on a green or black background, the words “High Voltage.” The provisions of this paragraph shall be held not to apply to crossarms supporting supply conductors in excess of 17,000 volts which are situated in rural districts.

(2) The provisions of paragraph (1) above shall be held not to apply to cross arms supporting supply conductors carrying more than 7500 volts, which are situated in rural districts, provided that:

a) At all crossings over public thoroughfares and at locations adjacent to structures such as water tanks, windmills, buildings, and over wells etc., the cross arms supporting conductors carrying 7500-17000 volts shall be marked as required in these rules.

b) All crossarms supporting conductors carrying voltage sin excess of 7500 volts at or below the level of circuits carrying less than 7500 volts on the same structure shall be marked as required in these rules. Hanger arms and arms supporting transformer cutouts shall be marked as required in subparagraph C(4) of this rule.

c) Where on the same structure crossarms support conductors carrying voltages 0-750 and conductors of 7500-17000 volts (each voltage class being on a separate arm, the higher voltage circuit being maintained at the upper level) the cross arm at the lowest level supporting 7500-17000 volt conductors shall be marked as required in these rules. Hanger arms and arms supporting transformer cutouts, shall be marked as required in subparagraph C(4) of this rule.

d) All crossarms supporting conductors of constant current series circuits carrying more than 750 volts shall be marked as required in these rules.

(1) Where supply circuits of 0-750 volts are carried on the same crossarm with circuits of 750-7500 volts, the sign shall be placed on the crossarm under the circuit of 750-7500 volts, or that end of the crossarm carrying circuits of 750-7500 volts shall be painted yellow from the center line of pole.

(2) Where the crossarm carries circuits of 750-7500 volts on both ends, 2 signs shall be used on both face and back of the cross arm or the sign may be divided, the word “High” being placed on one end and “Voltage” on the other to show that the entire cross arm carries high voltage circuits. This rule does not apply to systems where circuits of 0-750 volts and circuits of 750-7500 volts are not usually carried on the same crossarm.

(3) Where alley arms and bridge arm construction is used and supply circuits of 0-750 volts and 750-7500 volts are carried on the same arm, the High Voltage sign shall be placed under the circuit of 750-7500 volts or only that end of the arm that is under the 750-7500 volt conductors and half of the intervening space between these conductors and the 0-750 volt conductors shall be painted yellow.

(1) Heel Arms. ~~Where high voltage signs are used as the method of marking, they are not required on face of transformer heel arm.~~ The painting of heel arms or placing of high voltage signs on heel arms (either metal or wood) is not required where:

a) he length of the heel arm does not exceed the width of the transformer case where a single transformer is installed.

a) Where metal poles~~, towers o~~r and similar structures which support conductors in vertical configuration and not on cross arms are marked as ~~provided~~ required in Rules 51.6 ~~and 68~~ such marking shall be deemed sufficient ~~and no marking of the crossarm will be required~~.

b) Where metal poles or structures of a design easily climbed are guarded with barriers and equipped with signs as required in Rule 51.6-C, and where the higher level, and where the conductors carrying voltages in excess of 7500 volts are more than 15 feet distant from walls, fire escapes, exits, windows, etc., at which human contact may be expected:

1) No marking of crossarms supporting supply conductors will be required when all circuits on the structure carry 7500 volts and above.

2) Only the crossarms carrying 750-7500 volt conductors and the crossarm at the lowest level supporting 7500-17000 volt conductors are required to be marked as specified in these rules, where supply conductors of 0-750 volts and/or 750-7500 volts are supported on the structure carrying conductors of 7500 volts and above (each voltage class being on a separate arm).

(3) Where high voltage signs are used as the method of marking in lieu of painting, they are not required on the inside faces of double arms.

(4) Hanger arms and arms used to support transformer cutouts.

Where high voltage signs are used as a method of marking in lieu of painting, they are not required on the face of a line arm used as a hanger arm, or on the face of a separate hanger arm, or on the face of a separate arm supporting only cutouts under the following conditions:

a) Where two or more transformers or regulators or pieces of similar apparatus are hung on the same arm.

b) Where one or more transformers and one or more oil switches or air switches are hung on the same arm.

c) Where one or more constant current transformers or regulators and its accompanying series controller are hung on the same crossarm.

d) Where one transformer and one or more primary cutouts used in connection therewith are hung on the same arm, provided the conductors leading to these pieces of apparatus are supported on crossarms immediately adjacent thereto (maximum vertical separation of not more than 30 inches) shall have been marked in accordance with Rule 52.4-A.

e) Where on the same structure a separate crossarm is used to support only cutouts in circuit with a transformer supported on the next lower arm (maximum vertical separation of not more than 30 inches).

(5) Vertical configuration – No crossarms used.

Where conductors of 7500-17000 volts are supported in vertical configuration on poles and not on crossarms, the marking on the pole as provided in Rule 51.6-B shall be deemed sufficient and no painting or other marking will be required.

(6) Brackets: Where extension brackets or clearance brackets are used to extend or supplement crossarms , and said brackets support conductors carrying in excess of 750 volts, the painting or signing of these supplemental supports shall not be deemed necessary provided the crossarms or other supports to which they are attached have been marked as provided for in these rules.