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 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, or in lieu of temporary
grounding such hardware shall be proven by test to nonenergized immediately
preceding each period of work at that location.
(3) Transformer Cases and Hardware: See Rule 58.3-C3.
Strikeout and Underline 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, or in lieu of temporary
grounding such hardware shall be proven by test to nonenergized immediately
preceding each period of work at that location.
(3) Transformer Cases and Hardware: See Rule 58.3-C3.
Final 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.