Original Version

Rule 54.7-A

54.7-A.    Climbing Space

Climbing space, measured from centerline of pole, shall be provided on one side or in one quadrant of all poles or structures, with dimensions as specified in Rules 54.7-A1, 54.7-A2 and 54.7-A3.

The climbing space shall be maintained in the same position for a distance of not less than 4 feet vertically both above and below each conductor level through which it passes. Compliance with this requirement necessitates that the position of the climbing space shall not be changed through conductor levels which are less than 4 feet apart.  Where the vertical distance between consecutive conductor levels is 4 feet or more, and less than 8 feet the position of the climbing space through such consecutive levels may be shifted not more than one-quarter of the distance around the pole.  Where a conductor is installed at the top of a pole under the provisions of Rule 54.4-D8, the climbing space shall extend up to the level of such pole-top conductor but need not be provided through and above such level.

Allowable obstruction of these climbing spaces, where necessary, are specified in Rule 54.7-A4

This Rule 54.7-A need not apply to non-climbable metal poles in partial underground distribution, provided the regular written operating rules of the utility concerned specify that all work on conductors and equipment supported by such poles shall be performed only from aerial lifts and (1) in the case of primary conductors, shall be done with live-line tools after installing adequate insulating and protective devices or barriers in order to (a) prevent accidental contact by the workman with the energized conductors other than the conductor being worked on and (b) to minimize the possibility of simultaneous contact of the metal parts of live-line tools with the grounded pole and the energized conductor and (2) in the case of secondary conductors shall be done after suitably covering all energized primary conductors with adequate insulating and protective devices or barriers.

1)    Dimensions Where Crossarms are Not Involved:

Climbing space through the levels of conductors deadended on poles in vertical configuration shall be a square of the horizontal dimensions tabulated below; and one side of such climbing space shall be bounded by the vertical plane of the dead-ended conductors with the centerline of pole bisecting such side (see App. G, Fig, 15)

Voltage of Conductors	Dimensions of Square
750-7500 volts	30inches
7500-46,000 volts	36 inches
More than 46,000 volts	36 inches plus ½ inchPer kV in excess

For climbing space dimensions for low voltage rack construction see Rule 54.9-F.

2)    Dimensions Where Line Arms Only Are Involved:

The climbing space through levels where line arms without related buck arms are present on poles or structures shall be on one side or face of the pole, with the center line of pole approximately midway on one side of the climbing space (see App. G Fig. 16), and shall have the following dimensions:

For conductors of 0-7500 volts, the climbing space shall be not less than 30 inches square except that for combination arm construction the climbing space shall be not less than 36 inches square.  (see Rule 54.8-E for additional requirements where service drops from combination line arms are involved.)

For conductors of 750-46,000 volts the climbing space shall not be less than 36 inches square.

For conductors of more than 46,000 volts the climbing space shall be a square the sides of which shall be not less than 36 inches plus ½ inch per kV in excess of 46 kV.

The above dimensions may be reduced not more than 2 percent because of line angles.

The climbing space required by this rule may be shifted laterally not more than 5 inches under the condition that (a) the mid-point of the side of the climbing space coinciding with the center line of, the pole shall be not more than 5 inches from the center line of the pole, and (b) that full climbing space dimensions shall be maintained, but without the use of the 2% reduction where the shift is more than 2 inches.

3)    Dimensions Where Buck Arms Are Involved: The climbing space where line arms and related buck arms are involved on pole or structures shall be in a quadrant and shall have at least the dimensions, determined according to voltage classification as given below.  These dimensions are based on the minimum clearance from center line of pole (Table 1, Case 8) and minimum pin spacings (Table 2, Case 15) for the voltages involved, with the pin position numbered outward from the pole on the climbing side.

Where metal back braces are used they shall be considered as one of the arms of double arm construction.

a)    For Conductors of 0-750 Volts: Where single line arm and buck arm construction is involved and the climbing space is left open opposite the single arm, the No. 1 pin Position shall be left vacant in the single arm.  (See App G, Fig 18.)

Where double line arm and double buck arm construction is involved, the No. 1 pin position shall be left vacant in each arm.  (see App. G, Fig. 19)

b)    For conductors of More than 750 Volts: Where single arm and single buck arm construction is involved and the climbing space is left open on the opposite side of the pole from the arms, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 20).  As an alternative, where the conductors are of 750-7500 volts, the No. 1 and No. 2 pin positions in one arm may be left vacant provided the arms involved are in top positions on the pole.

Where double line arm and single buck arm, or vice versa, construction is involved and the climbing space is left open on the side of the pole opposite the single arm, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 21).  AS an alternative, where the conductors are of 750-7500 volts the No. 1 and No. 2 pin positions may be left vacant in the single arm provided the arm involved are in top positions on the pole.

Where double line arm and double buck arm construction is involved the No. 1 pin position shall be left vacant in one double arm and the No. 1 and No. 2 pin positions shall be left vacant in the other double arm.  (See App. G, Fig 22.)

Where a single circuit of more than 7,500 volts is in horizontal configuration at the top of the pole, climbing space has to be provided only up to and not through the top level and the No. 1 pin position need not be left vacant.

c)    For Combination Arm Construction with Line Arm and Line Buck Arm or Service Buck Arm:  (See Rule 54.8-E for additional requirements where service drops are involved.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 0-750 volt quadrant, the climbing space dimensions shall be not less than those prescribed in Rule 54.7-A3a for 0-750 volt conductors provided that the required vacant pin conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 23, 24 and 25.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 750-7500 volt conductors provided that the required vacant volt conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 26, 27 and 28.)

Where the vertical separation between conductor levels the vertical separation between conductor levels on line and buck arms is less than 4 feet such separation shall not be less than 2 feet and the climbing space dimensions, in any quadrant, shall be not less than those prescribed in Rule 54.7-A3b for 750-7500 volt conductors, provided that the required vacant pin spaces shall be in addition to the 42-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G Figs 29, 30 and 31.)

d)    Alternatives: Where a single line arm or single buck arm is involved and it is impractical to locate the climbing space in the quadrant on the opposite side of the pole from the single arm, it may be located in another quadrant provided that any single arm or arms within the climbing space shall be treated as a double arm.

In applying the pin position spacings as prescribed in Rule 54.7 not less than the minimum spacings of Table 2, Case 15 shall be used.  In the event the crossarms used are not bored for the minimum spacings, a spacing of conductors to give equivalent dimensions will be considered as meeting the requirements.

4)    Allowable Climbing Space Obstructions: Crossarms and their supporting members are allowed in climbing spaces provided that, where buck arms are involved, any arms within climbing spaces are treated as double arms.

Suitably protected vertical conductors attached tot eh surfaces of poles, and guys, (except those guys contacting metal pins or dead-end hardware as specified in Rule 52.7-D) are allowed in climbing spaces provided that not more than one guy and one vertical riser, run, or ground wire are installed in any 4-foot vertical section of climbing space.

Pin-type insulators which support line conductors of 20,000 volts or less may extend not more than one-half of their diameter into the climbing space.  Dead-end or strain type insulators which support line conductors of 0-750 volts may extend not more than one-half of their diameter into the climbing space.

Space bolts used for the attachment of dead-end hardware of a circuit of any voltage located below a circuit at the top of the pole may project into the climbing space provided they are protected with a suitable insulating cover, having an insulating value equal to the insulators on the associated circuit, and further that the area of the climbing space on a horizontal plane is not reduced by more than 10%.

Modifications of these requirements for rack construction are specified in Rule 54.9-F.

Strikeout and Underline Version

Rule 54.7-A

54.7-A.    Climbing Space

Climbing space, measured from centerline of pole, shall be provided on one side or in one quadrant of all poles or structures, with dimensions as specified in Rules 54.7-A1, 54.7-A2 and 54.7-A3.  For climbing space dimensions where post insulators are utilized see Rule 54.11-F.

The climbing space shall be maintained in the same position for a distance of not less than 4 feet vertically both above and below each conductor level through which it passes. Compliance with this requirement necessitates that the position of the climbing space shall not be changed through conductor levels which are less than 4 feet apart.  Where the vertical distance between consecutive conductor levels is 4 feet or more, and less than 8 feet the position of the climbing space through such consecutive levels may be shifted not more than one-quarter of the distance around the pole.  Where a conductor is installed at the top of a pole under the provisions of Rule 54.4-D8, the climbing space shall extend up to the level of such pole-top conductor but need not be provided through and above such level.

Allowable obstruction of these climbing spaces, where necessary, are specified in Rule 54.7-A4

This Rule 54.7-A need not apply to non-climbable metal poles in partial underground distribution, provided the regular written operating rules of the utility concerned specify that all work on conductors and equipment supported by such poles shall be performed only from aerial lifts and (1) in the case of primary conductors, shall be done with live-line tools after installing adequate insulating and protective devices or barriers in order to (a) prevent accidental contact by the workman with the energized conductors other than the conductor being worked on and (b) to minimize the possibility of simultaneous contact of the metal parts of live-line tools with the grounded pole and the energized conductor and (2) in the case of secondary conductors shall be done after suitably covering all energized primary conductors with adequate insulating and protective devices or barriers.

1)    Dimensions Where Crossarms are Not Involved:

Climbing space through the levels of conductors deadended on poles in vertical configuration shall be a square of the horizontal dimensions tabulated below; and one side of such climbing space shall be bounded by the vertical plane of the dead-ended conductors with the centerline of pole bisecting such side (see App. G, Fig, 15)

Voltage of Conductors	Dimensions of Square
750-7500 volts	30inches
7500-46,000 volts	36 inches
More than 46,000 volts	36 inches plus ½ inchPer kV in excess

For climbing space dimensions for low voltage rack construction see Rule 54.9-F.

2)    Dimensions Where Line Arms Only Are Involved:

The climbing space through levels where line arms without related buck arms are present on poles or structures shall be on one side or face of the pole, with the center line of pole approximately midway on one side of the climbing space (see App. G Fig. 16), and shall have the following dimensions:

For conductors of 0-7500 volts, the climbing space shall be not less than 30 inches square except that for combination arm construction the climbing space shall be not less than 36 inches square.  (see Rule 54.8-E for additional requirements where service drops from combination line arms are involved.)

For conductors of 750-46,000 volts the climbing space shall not be less than 36 inches square.

For conductors of more than 46,000 volts the climbing space shall be a square the sides of which shall be not less than 36 inches plus ½ inch per kV in excess of 46 kV.

The above dimensions may be reduced not more than 2 percent because of line angles.

The climbing space required by this rule may be shifted laterally not more than 5 inches under the condition that (a) the mid-point of the side of the climbing space coinciding with the center line of, the pole shall be not more than 5 inches from the center line of the pole, and (b) that full climbing space dimensions shall be maintained, but without the use of the 2% reduction where the shift is more than 2 inches.

3)    Dimensions Where Buck Arms Are Involved: The climbing space where line arms and related buck arms are involved on pole or structures shall be in a quadrant and shall have at least the dimensions, determined according to voltage classification as given below.  These dimensions are based on the minimum clearance from center line of pole (Table 1, Case 8) and minimum pin spacings (Table 2, Case 15) for the voltages involved, with the pin position numbered outward from the pole on the climbing side.

Where metal back braces are used they shall be considered as one of the arms of double arm construction.

a)    For Conductors of 0-750 Volts: Where single line arm and buck arm construction is involved and the climbing space is left open opposite the single arm, the No. 1 pin Position shall be left vacant in the single arm.  (See App G, Fig 18.)

Where double line arm and double buck arm construction is involved, the No. 1 pin position shall be left vacant in each arm.  (see App. G, Fig. 19)

b)    For conductors of More than 750 Volts: Where single arm and single buck arm construction is involved and the climbing space is left open on the opposite side of the pole from the arms, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 20).  As an alternative, where the conductors are of 750-7500 volts, the No. 1 and No. 2 pin positions in one arm may be left vacant provided the arms involved are in top positions on the pole.

Where double line arm and single buck arm, or vice versa, construction is involved and the climbing space is left open on the side of the pole opposite the single arm, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 21).  AS an alternative, where the conductors are of 750-7500 volts the No. 1 and No. 2 pin positions may be left vacant in the single arm provided the arm involved are in top positions on the pole.

Where double line arm and double buck arm construction is involved the No. 1 pin position shall be left vacant in one double arm and the No. 1 and No. 2 pin positions shall be left vacant in the other double arm.  (See App. G, Fig 22.)

Where a single circuit of more than 7,500 volts is in horizontal configuration at the top of the pole, climbing space has to be provided only up to and not through the top level and the No. 1 pin position need not be left vacant.

c)    For Combination Arm Construction with Line Arm and Line Buck Arm or Service Buck Arm:  (See Rule 54.8-E for additional requirements where service drops are involved.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 0-750 volt quadrant, the climbing space dimensions shall be not less than those prescribed in Rule 54.7-A3a for 0-750 volt conductors provided that the required vacant pin conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 23, 24 and 25.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 750-7500 volt conductors provided that the required vacant volt conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 26, 27 and 28.)

Where the vertical separation between conductor levels the vertical separation between conductor levels on line and buck arms is less than 4 feet such separation shall not be less than 2 feet and the climbing space dimensions, in any quadrant, shall be not less than those prescribed in Rule 54.7-A3b for 750-7500 volt conductors, provided that the required vacant pin spaces shall be in addition to the 42-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G Figs 29, 30 and 31.)

d)    Alternatives: Where a single line arm or single buck arm is involved and it is impractical to locate the climbing space in the quadrant on the opposite side of the pole from the single arm, it may be located in another quadrant provided that any single arm or arms within the climbing space shall be treated as a double arm.

In applying the pin position spacings as prescribed in Rule 54.7 not less than the minimum spacings of Table 2, Case 15 shall be used.  In the event the crossarms used are not bored for the minimum spacings, a spacing of conductors to give equivalent dimensions will be considered as meeting the requirements.

4)    Allowable Climbing Space Obstructions: Crossarms and their supporting members are allowed in climbing spaces provided that, where buck arms are involved, any arms within climbing spaces are treated as double arms.

Suitably protected vertical conductors attached tot eh surfaces of poles, and guys, (except those guys contacting metal pins or dead-end hardware as specified in Rule 52.7-D) are allowed in climbing spaces provided that not more than one guy and one vertical riser, run, or ground wire are installed in any 4-foot vertical section of climbing space.

Pin-type insulators which support line conductors of 20,000 volts or less may extend not more than one-half of their diameter into the climbing space.  Dead-end or strain type insulators which support line conductors of 0-750 volts may extend not more than one-half of their diameter into the climbing space.

Space bolts used for the attachment of dead-end hardware of a circuit of any voltage located below a circuit at the top of the pole may project into the climbing space provided they are protected with a suitable insulating cover, having an insulating value equal to the insulators on the associated circuit, and further that the area of the climbing space on a horizontal plane is not reduced by more than 10%.

Modifications of these requirements for rack construction are specified in Rule 54.9-F.

Final Version
Rule 54.7-A

54.7-A.    Climbing Space

Climbing space, measured from centerline of pole, shall be provided on one side or in one quadrant of all poles or structures, with dimensions as specified in Rules 54.7-A1, 54.7-A2 and 54.7-A3.  For climbing space dimensions where post insulators are utilized see Rule 54.11-F.

The climbing space shall be maintained in the same position for a distance of not less than 4 feet vertically both above and below each conductor level through which it passes. Compliance with this requirement necessitates that the position of the climbing space shall not be changed through conductor levels which are less than 4 feet apart.  Where the vertical distance between consecutive conductor levels is 4 feet or more, and less than 8 feet the position of the climbing space through such consecutive levels may be shifted not more than one-quarter of the distance around the pole.  Where a conductor is installed at the top of a pole under the provisions of Rule 54.4-D8, the climbing space shall extend up to the level of such pole-top conductor but need not be provided through and above such level.

Allowable obstruction of these climbing spaces, where necessary, are specified in Rule 54.7-A4

This Rule 54.7-A need not apply to non-climbable metal poles in partial underground distribution, provided the regular written operating rules of the utility concerned specify that all work on conductors and equipment supported by such poles shall be performed only from aerial lifts and (1) in the case of primary conductors, shall be done with live-line tools after installing adequate insulating and protective devices or barriers in order to (a) prevent accidental contact by the workman with the energized conductors other than the conductor being worked on and (b) to minimize the possibility of simultaneous contact of the metal parts of live-line tools with the grounded pole and the energized conductor and (2) in the case of secondary conductors shall be done after suitably covering all energized primary conductors with adequate insulating and protective devices or barriers.

1)    Dimensions Where Crossarms are Not Involved:

Climbing space through the levels of conductors deadended on poles in vertical configuration shall be a square of the horizontal dimensions tabulated below; and one side of such climbing space shall be bounded by the vertical plane of the dead-ended conductors with the centerline of pole bisecting such side (see App. G, Fig, 15)

Voltage of Conductors	Dimensions of Square
750-7500 volts	30inches
7500-46,000 volts	36 inches
More than 46,000 volts	36 inches plus ½ inchPer kV in excess

For climbing space dimensions for low voltage rack construction see Rule 54.9-F.

2)    Dimensions Where Line Arms Only Are Involved:

The climbing space through levels where line arms without related buck arms are present on poles or structures shall be on one side or face of the pole, with the center line of pole approximately midway on one side of the climbing space (see App. G Fig. 16), and shall have the following dimensions:

For conductors of 0-7500 volts, the climbing space shall be not less than 30 inches square except that for combination arm construction the climbing space shall be not less than 36 inches square.  (see Rule 54.8-E for additional requirements where service drops from combination line arms are involved.)

For conductors of 750-46,000 volts the climbing space shall not be less than 36 inches square.

For conductors of more than 46,000 volts the climbing space shall be a square the sides of which shall be not less than 36 inches plus ½ inch per kV in excess of 46 kV.

The above dimensions may be reduced not more than 2 percent because of line angles.

The climbing space required by this rule may be shifted laterally not more than 5 inches under the condition that (a) the mid-point of the side of the climbing space coinciding with the center line of, the pole shall be not more than 5 inches from the center line of the pole, and (b) that full climbing space dimensions shall be maintained, but without the use of the 2% reduction where the shift is more than 2 inches.

3)    Dimensions Where Buck Arms Are Involved: The climbing space where line arms and related buck arms are involved on pole or structures shall be in a quadrant and shall have at least the dimensions, determined according to voltage classification as given below.  These dimensions are based on the minimum clearance from center line of pole (Table 1, Case 8) and minimum pin spacings (Table 2, Case 15) for the voltages involved, with the pin position numbered outward from the pole on the climbing side.

Where metal back braces are used they shall be considered as one of the arms of double arm construction.

a)    For Conductors of 0-750 Volts: Where single line arm and buck arm construction is involved and the climbing space is left open opposite the single arm, the No. 1 pin Position shall be left vacant in the single arm.  (See App G, Fig 18.)

Where double line arm and double buck arm construction is involved, the No. 1 pin position shall be left vacant in each arm.  (see App. G, Fig. 19)

b)    For conductors of More than 750 Volts: Where single arm and single buck arm construction is involved and the climbing space is left open on the opposite side of the pole from the arms, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 20).  As an alternative, where the conductors are of 750-7500 volts, the No. 1 and No. 2 pin positions in one arm may be left vacant provided the arms involved are in top positions on the pole.

Where double line arm and single buck arm, or vice versa, construction is involved and the climbing space is left open on the side of the pole opposite the single arm, the No. 1 pin position shall be left vacant in both line arm and buck arm (see App. G, Fig. 21).  AS an alternative, where the conductors are of 750-7500 volts the No. 1 and No. 2 pin positions may be left vacant in the single arm provided the arm involved are in top positions on the pole.

Where double line arm and double buck arm construction is involved the No. 1 pin position shall be left vacant in one double arm and the No. 1 and No. 2 pin positions shall be left vacant in the other double arm.  (See App. G, Fig 22.)

Where a single circuit of more than 7,500 volts is in horizontal configuration at the top of the pole, climbing space has to be provided only up to and not through the top level and the No. 1 pin position need not be left vacant.

c)    For Combination Arm Construction with Line Arm and Line Buck Arm or Service Buck Arm:  (See Rule 54.8-E for additional requirements where service drops are involved.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 0-750 volt quadrant, the climbing space dimensions shall be not less than those prescribed in Rule 54.7-A3a for 0-750 volt conductors provided that the required vacant pin conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 23, 24 and 25.)

Where the vertical separation between conductor levels on line and buck arms is not less than 4 feet and the climbing space is in a 750-7500 volt conductors provided that the required vacant volt conductors provided that the required vacant pin spaces shall be in addition to the 36-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G, Figs 26, 27 and 28.)

Where the vertical separation between conductor levels the vertical separation between conductor levels on line and buck arms is less than 4 feet such separation shall not be less than 2 feet and the climbing space dimensions, in any quadrant, shall be not less than those prescribed in Rule 54.7-A3b for 750-7500 volt conductors, provided that the required vacant pin spaces shall be in addition to the 42-inch horizontal conductor separation required in Rule 54.4-C2b.  (See App. G Figs 29, 30 and 31.)

d)    Alternatives: Where a single line arm or single buck arm is involved and it is impractical to locate the climbing space in the quadrant on the opposite side of the pole from the single arm, it may be located in another quadrant provided that any single arm or arms within the climbing space shall be treated as a double arm.

In applying the pin position spacings as prescribed in Rule 54.7 not less than the minimum spacings of Table 2, Case 15 shall be used.  In the event the crossarms used are not bored for the minimum spacings, a spacing of conductors to give equivalent dimensions will be considered as meeting the requirements.

4)    Allowable Climbing Space Obstructions: Crossarms and their supporting members are allowed in climbing spaces provided that, where buck arms are involved, any arms within climbing spaces are treated as double arms.

Suitably protected vertical conductors attached tot eh surfaces of poles, and guys, (except those guys contacting metal pins or dead-end hardware as specified in Rule 52.7-D) are allowed in climbing spaces provided that not more than one guy and one vertical riser, run, or ground wire are installed in any 4-foot vertical section of climbing space.

Pin-type insulators which support line conductors of 20,000 volts or less may extend not more than one-half of their diameter into the climbing space.  Dead-end or strain type insulators which support line conductors of 0-750 volts may extend not more than one-half of their diameter into the climbing space.

Space bolts used for the attachment of dead-end hardware of a circuit of any voltage located below a circuit at the top of the pole may project into the climbing space provided they are protected with a suitable insulating cover, having an insulating value equal to the insulators on the associated circuit, and further that the area of the climbing space on a horizontal plane is not reduced by more than 10%.

Modifications of these requirements for rack construction are specified in Rule 54.9-F.