General Order 64-A

Original Version

Rule 58.4-C

58.4-C.    Grounds.

Transformer grounds of a conductivity not less than No. 6 A.W.G. copper wire shall be provided at any one of the following locations:

At the transformer pole.

At a pole adjacent to the transformer pole.

At load end of each service supplied from the transformer, separate from the usual house ground except that where three or more services are supplied from one transformer or bank of transformers, grounds at the two services nearest the transformer pole and one ground at services at approximately 500 foot intervals will suffice.

Strikeout and Underlined Version

Rule 58.4-C

58.4-C.    Grounds.

Transformerr ground connections other than those occurring on a common primary and secondary grounded neutral system shall have of a conductivity not less than that of No. 6 A. W. G. copper wire and shall be provided at one of the following locations:

At the transformer pole.

At a pole adjacent to the transformer pole.

At load end of each service supplied from the transformer, separate from the usual house ground, except that where three or more services are sup- plied from one transformer or bank of trans- formers, grounds at the two services nearest the transformer pole and one ground at services at approximately five hundred (500) foot intervals will suffice.

Where a common primary and secondary grounded neutral system is used, the grounding wire shall con- form to the requirements of Rule 57.8 for such systems and, furthermore, each transformer installation on a branch circuit without a loop return shall be so located that there will be one or more metallic water pipe system grounds of a resistance not greater than three and one-half (3.5) ohms on each side of the transformer installation.

A transformer installation located on a grid section requires no independent ground provided that there is a ground connection to the common neutral line conductor, either on the transformer pole or on an adjacent pole, having a resistance not in excess of three and one-half (3.5) ohms.

Final Version

Rule 58.4-C

58.4-C.    Grounds.

Transformer ground connections other than those occurring on a common primary and secondary grounded neutral system shall have a conductivity not less than that of No. 6 A. W. G. copper wire and shall be provided at one of the following locations:

At the transformer pole.

At a pole adjacent to the transformer pole.

At load end of each service supplied from the transformer, separate from the usual house ground, except that where three or more services are sup- plied from one transformer or bank of trans- formers, grounds at the two services nearest the transformer pole and one ground at services at approximately five hundred (500) foot intervals will suffice.

Where a common primary and secondary grounded neutral system is used, the grounding wire shall con- form to the requirements of Rule 57.8 for such systems and, furthermore, each transformer installation on a branch circuit without a loop return shall be so located that there will be one or more metallic water pipe system grounds of a resistance not greater than three and one-half (3.5) ohms on each side of the transformer installation.

A transformer installation located on a grid section requires no independent ground provided that there is a ground connection to the common neutral line conductor, either on the transformer pole or on an adjacent pole, having a resistance not in excess of three and one-half (3.5) ohms.