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Electrical: 1. Portable motors or other portable appliances energized by means of a cord or cable having an attachment plug end to be connected to an approved receptacle when that cord or cable is permitted by the Electrical Code. 2. Repair of fixed motors, transformers or fixed approved appliances of the same type and rating in the same location. 3. Listed, cord-and-plug temporary decorative lighting in or outside of one- and two- family dwellings. 4. Repair or replacement of current-carrying parts of any switch, contactor or control device the same location. 5. Reinstallation of attachment plug receptacles when the receptacle is not moved from its previous location, but not the outlets therefor. 6. Repair or replacement of any over current device of the required capacity in the same location. 7. Temporary wiring for experimental purposes in suitable experimental laboratories. 8. Electrical wiring, devices, appliances, apparatus or equipment operating at less than 25 volts and not capable of supplying more than 50 watts of energy. 9. Low-energy power, control and signal circuits of Class II and Class Ill as defined in the Electrical Code. Gas: 1. Portable heating, cooking or clothes drying appliances. 2. Replacement of any minor part that does not alter approval of equipment or make such equipment unsafe. 3. Portable-fuel-cell appliances that are not connected to a fixed piping system and are not interconnected to a power grid. Mechanical: 1. Portable heating appliances. 2. Portable ventilating appliances. 3. Portable cooling units. 4. Portable evaporative coolers. 5. Steam, hot- or chilled-water piping within any heating or cooling equipment regulated by the Mechanical code. 6. Replacement of any minor part that does not alter approval of equipment or make such equipment unsafe. 7. Refrigerating equipment which is part of the equipment for which a permit has been issued pursuant to the requirements of the technical codes. Self-contained refrigeration systems containing 10 pounds (4.54 kg) or less of refrigerant or that are actuated by motors of 1 horsepower (746 W) or less. 8. Portable-fuel-cell appliances that are not connected to a fixed piping system and are not interconnected to a power grid. Plumbing: 1. The stopping of leaks in drains, water, soil, waste or vent pipe; provided, however, that should any concealed trap, drain pipe, water, soil, waste or vent pipe become defective and it becomes necessary to remove and replace the same with new