Original Version

Rule 54.4-D8

54.4-D8)    At Top of Pole:

a)    0-7,500 Volts in Triangular Configuration: A single conductor of a circuit of 0-7,500 volts may be attached at the top of a pole provided the other conductors of the same circuit are on a crossarm and are not less than 2 feet vertically below the level of such single conductor, except that such a 2-foot vertical separation is not required for dead-ended conductors.

Where this triangular configuration is used, all conductors of other circuits on crossarms on the pole shall be not less than 4 feet below the level of the lower conductors of the pole-top circuit and conductors of 0-750 volts in rack construction shall conform to the requirements of Rule 54.9-E.

b)    More Than 7,500 Volts: A single conductor of a circuit of more than 7,500 volts may be attached directly to the top of a pole or to a crossarm at the top of a pole at a distance less than as specified in Table 1, Case 8, provided no apparatus carried on the pole is connected to the circuit so arranged except lightning arresters, a pole-top switch, or a transformer. Where a transformer is connected to a circuit so arranged, a vertical clearance of not less than 30 inches shall be maintained between the primary conductor directly above and the un-energized metal parts of the transformer, as specified in Rule, 58.3-B3e.

Where this construction is used, all conductors of other circuits on the pole shall be not less than 6 feet below the pole-top conductor except that in rural districts the conductors of a 0- 750 volt secondary circuit may be not less than 4 feet below the conductor level of such a primary circuit by means of which the secondary is applied.

The dead ending of a conductor at top of pole under these provisions is optional.

Strikeout and Underline Version

Rule 54.4-D8

54.4-D8)    At Top of Pole:

a)    0-7,500 Volts in Triangular Configuration: A single conductor of a circuit of 0-7,500 volts may be attached at the top of a pole provided the other conductors of the same circuit are on a crossarm and are not less than 2 feet vertically below the level of such single conductor, except that such a 2-foot vertical separation is not required for dead-ended conductors.

Where this triangular configuration is used, all conductors of other circuits on crossarms on the pole shall be not less than 4 feet below the level of the lower conductors of the pole-top circuit and conductors of 0-750 volts in rack construction shall conform to the requirements of Rule 54.9-E.

b)    More Than 7,500 Volts: A single conductor of a circuit of more than 7,500 volts may be attached directly to the top of a pole or to a crossarm at the top of a pole at a distance less than as specified in Table 1, Case 8, provided no apparatus carried on the pole is connected to the circuit so arranged except lightning arresters, a pole-top switch, or a transformer. Where a transformer is connected to a circuit so arranged, a vertical clearance of not less than 30 inches shall be maintained between the primary conductor directly above and the un-energized metal parts of the transformer, as specified in Rule, 58.3-B3e.

Where this construction is used, all conductors of other circuits on the pole shall be not less than 6 feet below the pole-top conductor except that in rural districts the conductors of a 0- 750 volt secondary circuit may be not less than 4 feet below the conductor level of such a primary circuit by means of which the secondary is applied.

The dead ending of a conductor at top of pole under these provisions is optional.

Clearance Between a Single Conductor and Center Line of Pole: A single conductor of a circuit may be attached directly to the top of a pole or to a crossarm at the top of a pole at a distance less than as specified in Table 1, Case 8. Where a transformer(s) or similar apparatus is connected to a circuit so arranged, a vertical clearance of not less than 30 inches shall be maintained between its un-energized metal parts and the primary conductor directly above.

Where this construction is used, no conductors of other circuits on the pole shall be less than 6 feet below the pole-top conductor.

EXCEPTION:    In rural districts this clearance may be reduced to 4 feet when the primary circuit supplies a 0-750 volt circuit below.

For pole-top triangular and vertical construction without the use of wood crossarms see Rule 54.11.

Final Version

Rule 54.4-D8

54.4-D8)    At Top of Pole:

Clearance Between a Single Conductor and Center Line of Pole: A single conductor of a circuit may be attached directly to the top of a pole or to a crossarm at the top of a pole at a distance less than as specified in Table 1, Case 8. Where a transformer(s) or similar apparatus is connected to a circuit so arranged, a vertical clearance of not less than 30 inches shall be maintained between its un-energized metal parts and the primary conductor directly above.

Where this construction is used, no conductors of other circuits on the pole shall be less than 6 feet below the pole-top conductor.

EXCEPTION:    In rural districts this clearance may be reduced to 4 feet when the primary circuit supplies a 0-750 volt circuit below.

For pole-top triangular and vertical construction without the use of wood crossarms see Rule 54.11.