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14.5.1. Electrical Systems General Operating Requirements. Personnel working with electrical equipment shall comply with NFPA 70E; NPR 8715.3, NASA General Safety Program Requirements; and AFI 32-1064. Particular attention shall be given to the following:
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Excessive humidity, wet areas, lack of protective matting, or equipment with exposed contacts to ground may require low or lesser voltage to be designated as high voltage. If these conditions exist, they increase the hazards of the operation.
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14.5.1.1. Personnel working with high voltage equipment shall not wear conductive grounding devices.
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14.5.1.2. Supervisors shall be responsible for ensuring that safe working conditions are provided; the work is done in a safe manner; and frequent inspections of equipment, materials, and the work site are conducted.
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14.5.1.3. Whenever maintenance or repair work is performed on potentially hazardous energized electrical equipment or circuits, a minimum of two people shall be present (buddy system).
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14.5.1.4. Rescue and first aid equipment shall be readily available in areas where electrical maintenance and repair work is being performed.
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14.5.1.5. Personnel exposed to energized electrical circuits shall not wear loose clothing, rings, watches, or other metallic objects that can act as conductors of electricity.
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14.5.1.6. Only a nationally recognized testing laboratory such as UL or FM, or those accredited by OSHA under the Nationally Recognized Testing Laboratory (NRTL) accreditation program, 29 CFR 1910.7, Definition and Requirements for a Nationally Recognized Testing Laboratory, weather proof or water-tight test and maintenance equipment shall be used in areas subject to excessive moisture.
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14.5.1.7. Only listed explosion and/or hazard-proofed test and maintenance equipment shall be used in potentially hazardous atmospheres.
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14.5.1.8. Before working on capacitor circuitry, external power and short terminals shall be disconnected and discharged to ground.
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14.5.1.9. If temporary power lines are required to extend across outside work areas, they shall be protected by a wooden cover or elevated so as not to interfere with personnel, vehicles, or equipment traffic.
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14.5.1.10. Electrical equipment cords shall have an equipment grounding conductor and shall be grounded when in use. Unless double insulated, the equipment exterior shall be securely bonded and grounded.
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14.5.1.11. Dead-end wires shall be completely insulated.
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14.5.1.12. Energized equipment will be manned or connected to the manned facility emergency power shut-off system. The electrical equipment will be powered down during non-working hours.
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14.5.1.13. All electrical equipment located outside a hazardous processing area will be inhibited from supplying power to electrical equipment located within the hazardous processing area during non-working hours.
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14.5.1.14. Electrical equipment that must remain energized for hazardous operations (i.e., maintaining spacecraft thrusters solenoid valves in an opened or closed state) shall be equipped with an uninterrupted power source such as a battery backup.
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14.5.2. Electrical Systems Pre-Operational Requirements
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14.5.2.1. With the exception of test and checkout, all electrical equipment and circuits shall be de-energized before any work is started on these circuits or equipment through a scheduled power outage.
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14.5.2.2. Power outages in facilities shall be coordinated with the affected parties.
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14.5.2.3. When work is being done on circuits, the line switch shall be locked out and tagged in accordance with NFPA 70E, Part II.
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14.5.2.4. Electrical conductors shall be routed to eliminate tripping hazards or contact with energized lines.
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14.5.3. Electrical Systems Operating Requirements
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14.5.3.1. During repair or maintenance, if panel covers are removed and panels left open to obtain power where none is available, a DANGER HIGH VOLTAGE sign shall be placed next to the open panel and a temporary cover manufactured and installed. When cable connections are made that require the removal of the panel cover, a suitable temporary cover with openings to accommodate the temporary cables shall be used.
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14.5.3.2. Insulated fuse pullers shall be used for removal of fuses. Only fuses of proper rating shall be used in circuits. No other material shall be used in place of a fuse.
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14.5.3.3. Personnel who are exposed to energized circuits for electrical activities such as troubleshooting, maintaining, or repairing electrical equipment energized with 50 volts or more shall stand on non-conductive matting.
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14.5.3.4. Grounding or shorting sticks (or cables) shall be used on potentially “hot” circuits and shall not be removed until repairs are completed.
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