11.A.04 Flexible Cords.
- Refer to NEC (NFPA 70) for minimum requirements on permanent use flexible cords for permanently installed equipment such as cranes and elevators.
- For maintenance and construction activities, all portable flexible cords or cables (i.e., extension cords) must be inspected by the user of the cord at least daily.
- Portable flexible cords must contain the number of adequately sized conductors required for the load plus an adequately sized equipment ground conductor. A QP must determine appropriate hard or extra hard usage flexible cord length and size as specified in the NEC, Article 400. Portable flexible cords must be minimum 14 AWG.
- Portable flexible cords passing through work areas must be protected from damage (including that caused by foot traffic, vehicles, sharp corners, protections, and pinching). Flexible cords and cables passing through holes must be protected by bushings or fittings.
- Portable flexible cords must be used only in continuous lengths without splice or tap. The repair of hard-service cords/cord sets is permitted if conductors are spliced in accordance with NEC - the splices must be performed by a QP, the insulation is equal to the cable being spliced, and wire connections are soldered.
- Patched, oil-soaked, worn, or frayed electric portable flexible cords must not be used.
- Portable flexible cords must be supported in place at intervals that ensure that they will be protected from physical damage. Support must be in the form of cable ties, straps or similar type fittings installed so as not to cause damage. They must not be hung from nails, or suspended by bare wire.
11.A.05 The QP is responsible for determining the number of workers required to perform the job safely and must identify work hazards and controls in the corresponding AHA. Work must be performed with a sufficient number of workers to provide a safe working environment.
11.A.06 Switchboxes, receptacle boxes, metal cabinets, enclosures around equipment, and temporary power lines must be marked to indicate the maximum operating voltage.
11.A.07 Insulation mats or platforms of substantial construction and providing good footing must be placed on floors and on the frames of equipment having exposed live parts so that the operator or persons in the vicinity cannot touch such parts unless standing on the mats, platforms, or insulated floors.
11.A.08 Suitable temporary barriers or other means must be provided to designate arc flash and electrical shock boundaries. Boundaries must ensure a workspace cannot be used as a passageway while electrical work is being performed.
11.A.09 When fuses are installed or removed with one or both terminals energized, use an insulated fuse pulling tool for the rated voltage.
11.A.10 Attachment Plugs and Receptacles.
- Plugs and receptacles must be kept out of water unless of an approved submersible type.
- Attachment plugs for use in work areas must be constructed so that they will endure rough use and must be equipped with a cord grip to prevent strain on the terminal screws.
- Attachment plugs and other connectors supplying equipment at more than 240 volts must be skirted or otherwise designed so that arcs will be confined.
- Plugs and receptacles in power distribution networks of over 240 volts must be inspected by a QP before each use.
- Physical attachment of plugs into receptacles rated over 240 volts must be made with the circuit de-energized.
- Appropriate PPE must be worn prior to energizing circuits feeding equipment plugged in to receptacles rated over 240 volts.
- When a National Electrical Manufacturers Association (NEMA) standard configuration exists for a particular voltage, amperage, frequency, or type of current, the NEMA standard plug and receptacle must be used.
11.A.11 Portable Hand Lamps.
- Portable hand lamps must be of molded composition or another type approved for the purpose.
- Metal-shell, paper-lined lamp holders must not be used.
- Hand lamps must be equipped with a handle and a substantial guard over the bulb. The guard must be attached to the lamp holder or the handle.
11.A.12 Metal jewelry (i.e., wristbands, watch chains, rings, bracelets, necklaces, body jewelry, piercings, etc) must not be worn when working on or near electrical equipment.
Knowledge Check Choose the best answer for the question.
11-2. Physical attachment of plugs into receptacles rated _____ must be made with the circuit de-energized.
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