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Overhead Line Work Practices

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Overhead Line Work Practices PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices Topic Section General Work Practice 1 Grounding Configurations 2 Grounding Transmission Lines with Distribution Underbuild 3 On A Wood Pole without Distribution Underbuild 4 With Master Grounds Installed Away from the Work Location 5 Grounding on Overhead Transmission Towers 6 Conductor Installation and Removal 7 Additional Precautions 8 Installing Grounds on Cable Terminals 9 PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 1 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices 1. General Work Practice Transmission Overhead Lines: Reference TAG-001 1.1. An Equipment Outage Request (EOR) or Clearance to Work (CTW) is submitted to de-energize the equipment. Protection Leader/Held For Person requests protection. 1.2. After protection/clearance is granted, the Protection Leader/Held For Person must notify all personnel when it is acceptable to test the conductor and install the grounds. 1.3. The Transmission Overhead Line personnel shall test to ensure the line is de-energized. 2. Grounding Configurations 2.1. Connect personal protective grounding to create an equipotential work zone (EPZ). 2.1.1. When utilizing Equipotential Zones, any conductive parts in reach of the lineman on the structure (i.e. guy wires, phone, cable) must be bonded to the rest of the grounded conductors to equalize the electrical potential. This includes any conductive materials or tools that could extend the employees reach and equipment and/or material that is within the Zone. 2.1.1.1. Conductive parts in reach of the lineman include uninsulated guy wires, static, or fiber optic OPGW. 2.2. Grounding on Overhead Ground Wires 2.2.1. Non-insulated overhead ground wires shall be electrically bonded to the structure grounding system prior to making contact with the overhead ground wire. (See Figure 1) The overhead ground wire shall always be bonded to the structure ground by a temporary protective ground cable when any part of the overhead ground wire connecting hardware is to be disconnected. An EPZ shall be maintained at all times while making contact. PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 2 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices 2.3. Insulated Overhead Ground Wires 2.3.1. When work is performed in the vicinity or on insulated overhead ground wires, the Minimum Approach Distances must be maintained (See MAD Table in SAF-072 Main Section) or temporary protective grounds and EPZs shall be applied in accordance with this policy. Typical Insulated Connection Insulator Temporary Energized OGW Used for Electric Communications Bond Typical Steel Structure Connection Mechanical Bond Temporary Electric Bond Temporary Electric Bond Typical Wood Pole Connection Mechanical Bond Overhead Ground Wire Attachments (Figure 1) 2.3.2. An Equipotential Zone shall be established at the work location. 2.3.2.1. On a steel structures, it is established using the structure itself and approved ground jumpers. 2.3.2.2. On wood poles, it is established using a cluster bar and approved ground jumpers. 2.3.3. When a grounding cluster is utilized, it must be placed immediately below or within close proximity of the working area of the lineman on the pole or structure. 2.3.4. At a minimum, the phase that is being worked on must have a personal ground at the work location. PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 3 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices 2.4. Preferred Grounding Methods 2.4.1. Combination Grounding – This is a method which is the safest and employs the use of master ground sets located on a section of transmission line with working grounds employed at the worksite by the crew. The crew may use a single ground at the work location provided this ground is installed and removed after working on each conductor attached to the transmission structure. 2.4.2. Worksite Grounding – This method is an alternative to the Combination method when work is confined at a single location. All conductors are grounded to an adequate ground source when this method is employed. 2.4.3. Bracket Grounding – A method of grounding which is a last resort when combination grounding or worksite grounding could cause a greater hazard as a result of a jobsite condition. 2.4.3.1. When bracket grounds are used, they shall be installed between the work area and all electrical sources of potential as defined in TAG-005. 2.4.3.2. Bracket grounds should be placed at the work site, or as close as possible to the work location. 2.5. Grounding for Broken Conductors 2.5.1. When conductors are broken and lying on the ground, grounds should be installed at locations on each side of the work area, and as close to the work as conditions will allow. An equipotential zone must be established. 2.5.2. When closing a circuit with a splice/jumper or cutting open a line, the circuit will be tied together or “jumpered or macked- out” with a set of protective grounds prior to the installation of the permanent jumper/splice or cutting it open to maintain equal potential across the opening. 2.6. Ground personnel shall be protected from hazardous differences in electrical potential. Protection for ground personnel shall be provided by several methods including: creating equipotential zones (EPZ), insulating and/or isolating equipment, and restricted work areas/limited access zones. PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 4 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices 2.6.1. A ground mat may be used to establish an EPZ for workers on the ground. 2.6.2. Rubber insulating equipment may be used to protect personnel handling grounded equipment and conductors from hazardous touch potentials. However, the insulating equipment must be rated for the highest voltage that can be impressed on the grounded objects under fault conditions. 2.6.3. Restricting and/or barricading of work areas where hazardous step or touch potential could arise may be employed to protect personnel not directly involved with the work. 3. Grounding Transmission Lines with Distribution Underbuild 3.1. Make the grounding connections in the following order: 3.1.1. Install a cluster bar on the pole just below the work area. 3.1.2. Install a 4/0 shunt from the cluster bar to the driven/screw in ground rod. 3.1.2.1. Due to structure configuration, if it is infeasible to install a 4/0 shunt from the cluster bar to the driven/screw in ground rod at that location, then equally effective alternative grounding configuration may be used. This may be accomplished by grounding in the manner described in this section one structure away and installing a cluster bar at the structure being worked on and attaching a bond from the cluster bar to the phase being worked on. MAD shall be observed from the unbonded phases. 3.1.3. Install a ground jumper from the best available ground source which may be the system neutral or a driven/screw in ground rod to the cluster bar. If necessary, install cover up to prevent the grounding jumpers from contacting energized conductors. 3.1.4. Jumper from the cluster bar to the closest phase conductor. 3.1.5. Jumper the other phases together, working from the nearest to the farthest away. 3.1.6. Remove the grounds in the reverse order. PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 5 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices 4. Grounding of Overhead Transmission Lines On A Wood Pole Without Distribution Underbuild 4.1. The grounding connections shall be made in the following order: 4.1.1. Install a temporary ground rod. Surround the ground rod with safety cones to remind workers of the hazard. 4.1.2. Install a cluster bar on the pole/poles and below the work area nearest the lowest conductor. 4.1.3. Clamp one end of the proper length jumper to the ground rod and the other end to the cluster bar(s). 4.1.4. Jumper from the cluster bar(s) to the closest phase conductor. Jumper to the other phases using the remaining jumpers. It is important to bond the phases together so that the protective devices operate properly. 4.1.4.1. Static/shield wires will be included in the grounding configuration. 4.1.5. Remove the grounds in the reverse order. 5. Grounding of Overhead Transmission Lines With Master Grounds Installed Away from the Work Location (Figure 2) 5.1. Conductor being worked on shall be grounded to the structure at the work location. 5.2. MAD distances shall be maintained on ungrounded conductors at the work location. 5.3. Breakaway bonds (1/0 copper) shall be connected from the uninsulated aerial work platform to the conductor being worked. PROPRIETARY, CONFIDENTIAL OR PRIVILEGED INFORMATION Verify Current Version Prior to Use — Uncontrolled When Printed Rev. # 000 Page 6 of 10 Doc. ID: SAF-072 PERSONAL PROTECTIVE GROUNDING Attachment 1 Overhead Line Work Practices Overhead Transmission Line Grounding With Grounds Installed Away from the Work Location (Uninsulated Aerial Device) Figure 2 6. Grounding on Overhead Transmission Towers 6.1. Inspect the tower structure grounds to make sure that they are in good condition.
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