Rules For Overhead Electric Line Construction

Rule 20.6 - Definitions of Terms as Used in The Rules of This Order

Circuit means a conductor or system of conductors located outside of buildings and through which an electric current flows or light is transmitted.

A. Class C Communication Public and Private Circuits mean circuits used for public or private communication service and are divided as follows:

(1) Current carrying circuits operating at potentials not exceeding 400 volts to ground or 750 volts between any two points of the circuit and the transmitted power of which does not exceed 150 watts. When operated at less than 150 volts, no limit is placed on the capacity of the system. Any circuit which exceeds the above values used for information transport shall be treated as a supply circuit and must meet the supply requirements for the voltage involved.

(2) Fiber optic circuits transmitting light for communication purposes (see definition, Rule 20.4 ).

Note: Information systems including, but not limited to, telephone, railroad signal, data, clock, fire or police alarms, cable television and other systems conforming with the above are included in this classification.

B. Intentionally Left Blank.

Note: Rule deleted January 19, 1994 by Resolution SU-25.

C. Railway Signal Circuits mean those supply and communication circuits used primarily for supplying energy for controlling the operation of railway block signals, highway crossing signals, interlocking apparatus and their appurtenances.

(1) Circuits which operate at less than 400 volts to ground are considered as communication (Class C) circuits and shall be so classified and treated provided that, if the voltage exceeds 150 volts between conductors the power transmitted shall not exceed 150 watts. Where all circuits of a line are owned and operated by one utility, the voltage between conductors carrying in excess of 150 watts may be increased to not more than 250 volts and the signal circuits may be considered as communication (Class C) circuits.

(2) All railway signal circuits which do not meet the requirements above shall be treated as supply circuits of corresponding voltage.

D. Supply Circuits mean those circuits which are used for transmitting a supply of electrical energy.

(1) Class E circuits include constant potential alternating or direct current circuits of 300,000 volts or more between any two conductors.

(2) Class H circuits include the following:

Constant potential alternating current circuits of 5,000 volts or more but less than 300,000 volts between any two conductors.

Constant potential alternating current circuits of 2,900 volts or more but less than 174,000 volts between any conductor and ground.

Constant potential direct current circuits exceeding 750 volts but less than 150,000 volts between any conductor and ground.

Constant current circuits of 7.5 amperes or less supplied from transformers or devices having a normal full load output voltage of 5,000 volts or more.

Constant current circuits of more than 7.5 amperes supplied from transformers or devices having an open circuit voltage of 2,900 volts or more.

(3) Class L circuits include the following:

Constant potential alternating or direct current supply circuits of lower voltage than Class H.

Constant current circuits of 7.5 amperes or less supplied from transformers or devices having a normal full load output voltage less than 5,000 volts.

Constant current circuits of more than 7.5 amperes supplied from transformers or devices having an open circuit output voltage less than 2,900 volts.

Note: Revised March 30, 1968 by Decision No. 73813.

E. Class T Circuits mean trolley contact conductors, feeder wires and other conductors metallically connected to such contact conductors, used in electric railway or trolley operation. These Class T circuits are supply circuits, further classified as Class L or Class H depending upon the voltage and nature of current used.
Rule 41.0 - Classification of Circuits and Grades of Construction

For the purpose of recognizing relative hazards, lines are segregated into classes which are defined in Rule 20.6. These classes of lines and the relation of lines to each other and to objects over which they are constructed determine the grade of construction.
Rule 42.0 - Grades of Construction

For all classes of lines, the relative order of grades is"A", "B", and "C" and "A" grade being the highest. Supply and communication lines, where not involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as follows:

Class E supply circuit - Grade B
Class H supply circuit - Grade B
Class L supply circuit - Grade C
Class C communication circuit - Grade C

Supply and communication lines, where involved in crossings, conflicts or on poles jointly used, shall be constructed and maintained so as to conform with grades of construction not less than as specified in Table 3.

Note: Revised March 30, 1968 by Decision No. 73813 and February 5, 2014 by Decision No. 14-02-015.
Rule 43.1 - Heavy Loading

Heavy loading shall apply in all parts of the State of California where the elevation exceeds 3000 feet above sea level (see Appendix A for map indicating the approximate location of the heavy loading district). This loading shall be taken as the resultant stress due to wind, ice and dead weight under the following conditions:

A. Wind

A horizontal wind pressure of 6 pounds per square foot of projected area on cylindrical surfaces, and 10 pounds per square foot on flat surfaces shall be assumed. Where latticed structures are used, the actual exposed area of one lateral face shall be increased by 50% to allow for pressure on the opposite face, provided this computation does not indicate a greater pressure than would occur on a solid structure of the same outside dimensions, under which conditions the latter shall be taken.

B. Ice

A radial thickness of one half inches of ice, weighing 57 pounds per cubic foot, on all conductors shall be assumed in computing vertical and wind loadings.

C. Temperature

Conductor temperature shall be assumed to be 0����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������°F at the time of maximum loading. A conductor temperature of at least 130����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½����¯�¿�½������¯����¯�¿�½���¯���¿���½����¯�¿�½������¿����¯�¿�½���¯���¿���½����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½������¯����¯�¿�½������¿����¯�¿�½������½����¯�¿�½���¯���¿���½������¯������¿������½����¯�¿�½���¯���¿���½����¯�¿�½������°F shall also be assumed for computing sag and its effect on structural loads due to weight span.
Rule 44.0 - Safety Factors

The safety factors specified in these rules are the minimum allowable ratios of material and/or line element strengths to the effect of design loads as specified in Rule 43.
Rule 44.1 - Installation and Reconstruction

Lines and elements of lines, upon installation or reconstruction, shall provide as a minimum the safety factors specified in Table 4. The design shall consider all supply and communication facilities planned to occupy the structure. For purposes of this rule, the term "planned" applies to the facilities intended to occupy the structure that are actually known to the constructing company at the time of design.

The entity responsible for performing the loading calculation(s) for an installation or reconstruction shall maintain records of these calculations for the service life of the pole or other structure for which the a loading calculation was made and shall provide such information to authorized joint use occupants and the Commission upon request.
Rule 44.2 - Additional Construction

Any entity planning the addition of facilities that materially increases loads on a structure shall perform a loading calculation to ensure that the addition of the facilities will not reduce the safety factors below the values specified by Rule 44.3. Such loading calculations shall be based on existing condition and proposed configuration, information provided under Rule 44.4, conservative values of relevant parameters, industry recognized values of relevant parameters, or any combination thereof. For wood structures more than 15 years old, the loading calculation shall incorporate the results of intrusive inspections performed within the previous five years. Such entity shall maintain these loading calculations for the service life of the pole or other structure for which a loading calculation was made and shall provide such information to authorized joint use occupants and the Commission upon request.
Rule 44.3 - Replacement

Lines or parts thereof shall be replaced or reinforced before safety factors have been reduced (due to factors such as deterioration and/or installation of additional facilities) in Grades "A" and "B" construction to less than two-thirds of the safety factors specified in Rule 44.1 and in Grade "A" construction to less than one-half of the safety factors specified in Rule 44.1. Poles in Grade "A" construction that only support communication lines shall also conform to the requirements of Rule 81.3-A. In no case shall the application of this rule be held to permit the use of structures or any member of any structure with a safety factor less than one.
Rule 44.4 - Cooperation

All entities with facilities on the subject pole shall cooperate with the company performing the load calculations necessitated by the provisions of Rule 44.1, 44.2 or 44.3, including, but not limited to, promptly providing or making reasonably available, upon request and to the extent it exists, the following:

A. The most recent intrusive pole test data

B. Any information regarding its facilities necessary to perform a pole loading calculation that is not readily available to the company performing the pole loading calculations through a field visit; and

C. A table of standard input values used by the Responding Company in pole loading calculations (e.g., standard conductor or cable sizes, tension values, and equipment sizes and weights).

In the event a pole attachment application or a joint pole application submitted to a pole owner is rejected, the pole owner shall provide the applicant with the reason(s) for the rejection with the returned application. In the event a pole attachment application or a joint pole application is rejected by a pole owner because it has failed to meet the pole loading limitations established by the pole owner (consistent with General Order 95 or any subsequent regulation), the pole owner should also provide the applicant with sufficient information to determine how the pole loading limitations were exceeded with the returned application.
Rule 94.3 - General Requirements

On joint use poles supporting Class T, C, L or H Circuits (up to 50 kV), the following shall apply:

A. Antennas shall meet the requirements of Class C equipment, unless otherwise specified in this rule.

B. All associated elements of the antenna (e.g. associated cables, messengers) shall meet the requirements of Class C circuits.

C. Support elements (e.g. arms, braces, brackets, hardware) and pole-top extensions shall conform to the requirements of Section IV.
Rule 94 - Final Version

Antennas

94.1 Definition (See Rule 20.0)

94.2 Maintenance and Inspection (See Rules 31.1 and 31.2)

94.3 General Requirements

On joint use poles supporting Class T, C, L or H Circuits (up to 50 kV), the following shall apply:

A. Antennas shall meet the requirements of Class C equipment, unless otherwise specified in this rule.

B. All associated elements of the antenna (e.g. associated cables, messengers) shall meet the requirements of Class C circuits.

C. Support elements (e.g. arms, braces, brackets, hardware) and pole-top extensions shall conform to the requirements of Section IV.

Note: Support elements (e.g. arms, braces, brackets, hardware) and pole-top extensions installed above supply lines shall meet Grade A requirements and safety factors specified in Rule 44, Table 4.

94.4 Clearances

A. Antennas and supporting elements below supply lines shall maintain a vertical clearance of 6 feet from Supply Conductors operating at 0-50kV. (See Figure 94-1)

B. Antennas and supporting elements below communication lines shall maintain a 2 ft. vertical separation from communication conductors and equipment. (See Figure 94-1)

C. Antennas, associated equipment (e.g. terminations, enclosures) and support elements installed above supply lines and/or communication lines of different ownership attached to the same structure shall maintain the vertical clearances specified in Rule 38, Table 2, Case 21, Columns A - H.

Note: Other vertical clearances between communication equipment and supply lines are specified in Rule 92.1-F(2).

D. Antennas, associated equipment (e.g. terminations, enclosures) and support elements, installed above supply lines and/or communication lines of different ownership, shall maintain the radial clearances from unattached supply and communication lines specified in Rule 38, Table 2, Case 3.

E. Antennas shall maintain a 2 ft.horizontal clearance from centerline of pole when affixed between supply and communication lines or below communication lines. (See Figure 94-1)

F. Horizontal clearances from centerline of the pole for Antennas, associated equipment and support elements, affixed between supply lines or at the top of a climbable pole, are not specified, but must be arranged so that the pole may be climbed safely.

G. Antennas shall have a vertical clearance above ground as specified in Rule 37, Table 1, Column B, Cases 1 -6a. (See Figure 94-1)



94.5 Marking

A. No antenna owner or operator shall install an antenna on a joint use pole unless such installation is subject to an agreement with the pole owner(s) that includes marking requirements that are substantially similar to and achieve at least the same safety standards as those set forth in Appendix H to GO 95.

B. Joint use poles shall be marked with a sign for each antenna installation as follows:

(1) Identification of the antenna operator

(2) A 24-hour contact number of antenna operator for Emergency or Information

(3) Unique identifier of the antenna installation.

94.6 Climbing Space

A. Climbing space above supply lines shall be maintained in accordance with Rule 54.7-A to:

(1) The bottom of the Antenna (including associated support elements) if affixed less than eight inches from the surface of the pole at the top of the pole or pole-top extension.

(2) The top of the pole or pole-top extension if the Antenna (including associated support elements) is affixed more than eight inches from the surface of the pole or pole-top extension.

(3) The bottom of the uppermost Antenna (including associated support elements) if multiple Antennas are present at different levels above supply lines.

B. Climbing space above communication lines shall be maintained in accordance with Rule 84.7 to:

(1) The bottom of the Antenna (including associated support elements) at the top of the pole or pole-top extension when affixed less than eight inches from the surface of the pole.

(2) The top of the pole or pole-top extension if the Antenna (including associated support elements) is affixed more than eight inches from the surface of the pole or pole-top extension.

(3) The bottom of the uppermost Antenna (including associated support elements) if multiple Antennas are present at different levels.

94.7 Stepping (See Rule 91.3)

94.8 Risers and Vertical Runs

A. Risers and vertical runs passing supply lines and/or equipment or communication lines and/or equipment on nonmetallic structures (e.g. single wood, concrete, composite, fiberglass poles or multiple pole configurations) shall be suitably covered throughout their length; shall occur on a single pole; shall be installed outside the climbing space; and shall be constructed and maintained in accordance with Rules 54.6-D 1, 2, 3 and 5.

(1) Associated cable runs extending to an adjacent structure or building shall be bonded to existing communication cables and messengers and effectively grounded at the originating structure (see Rule 83.4). Where communication guard arm construction exists, the protective covering shall extend below the arm.

B. The suitable protective covering (see Rule 22.8) for risers and vertical runs passing supply lines and/or equipment shall extend no less than (See Figure 94-1):

(1) 3 ft. above lines energized from 0-750 Volts.

(2) 6 ft. above lines energized from 750-35,000 Volts.

(3) 9 ft. above lines energized from 35,000-50,000 Volts.

C. Risers and vertical runs passing supply lines and/or equipment or communication lines and/or equipment on metallic structures shall occur on a single structure, and be installed outside the climbing space in accordance with Rule 54.6-D4.

94.9 De-energizing

No antenna owner or operator shall install an antenna on a joint use pole unless such installation is subject to an agreement with the pole owner(s) that includes de-energizing protocols that are substantially similar to and achieve at least the same safety standards as those set forth in Appendix H to GO 95.

Exceptions:

Antennas utilized by utilities for the sole purpose of operating and monitoring their supply system are exempt from this rule and shall only meet the construction and clearance requirements of supply equipment.

Antennas embedded in or attached to communication cables and messengers are exempt from this rule and shall only meet the construction requirements for Class C circuits.