Original Version

Rule 52.7-F

52.7-F.    Grounding

(1)    Circuits of 0-7500 Volts: On Wood crossarms, wood poles, or wood structures, hardware which is less than 3 feet above or 6 feet below unprotected conductors of 0-7500 volts shall be nongrounded.  Excepted from the requirements of this rule are the following:

Hardware of riser terminals treated as specified in Rule 54.6-F;

Hardware associated with grounded cables and messengers supported on crossarms with vertical clearances and pole clearances as specified in Tables 1 and 2 for such cables and messengers; and

Hardware associated with guarded cables and messengers which are treated as specified in Rule 57.4-F.

(2)    Circuits of More Than 7500 Volts: Hardware of circuits of more than 7500 volts shall be securely and permanently grounded where such hardware can act as a bond between metal parts of the insulating supports of an energized conductor and of a de-energized portion of the same conductor or of the de-energized portion of another conductor where work is to be performed on the de-energized conductor.  Such hardware includes the bases of air-break switches and the tanks of oil switches.  Bond wires are excepted from this requirement, and are not required to be permanently grounded.

The permanent grounding specified in this rule will not be required provided the regular written operating (safety) rules of the utility concerned require that:

Conductors of Circuits exceeding 7500 volts which are de-energized for work thereon shall be securely grounded during all periods of such work, and

When work is to be performed at the location of hardware described in this rule, such hardware shall be temporarily and securely grounded and securely connected to any de-energized conductors involved during all work at the location.

(3)    Transformer Cases and Hardware: See Rule 58.3-C3.

Strikeout and Underline Version

Rule 52.7-F

52.7-F.    Grounding Grounded (see Rule 54.4-G)

(1)    Circuits of 0-7500 Volts: On Wood crossarms, wood poles, or wood structures, hardware which is less than 3 feet above or 6 feet below unprotected conductors of 0-7500 volts shall be nongrounded.  Excepted from the requirements of this rule are the following:

Hardware of riser terminals treated as specified in Rule 54.6-F;

Hardware associated with grounded cables and messengers supported on crossarms with vertical clearances and pole clearances as specified in Tables 1 and 2 for such cables and messengers; and

Hardware associated with guarded cables and messengers which are treated as specified in Rule 57.4-F.

(2)    Circuits of More Than 7500 Volts: Hardware of circuits of more than 7500 volts shall be securely and permanently grounded where such hardware can act as a bond between metal parts of the insulating supports of an energized conductor and of a de-energized portion of the same conductor or of the de-energized portion of another conductor where work is to be performed on the de-energized conductor.  Such hardware includes the bases of air-break switches and the tanks of oil switches.  Bond wires are excepted from this requirement, and are not required to be permanently grounded.

The permanent grounding specified in this rule will not be required provided the regular written operating (safety) rules of the utility concerned require that:

Conductors of Circuits exceeding 7500 volts which are de-energized for work thereon shall be securely grounded during all periods of such work, and

When work is to be performed at the location of hardware described in this rule, such hardware shall be temporarily and securely grounded and securely connected to any de-energized conductors involved during all work at the location.

(3)    Transformer Cases and Hardware: See Rule 58.3-C3.

Final Version

Rule 52.7-F

52.7-F.    Grounded (see Rule 54.4-G).