When to Use Metal Electrical Box or Plastic Box - The Spruce The only requirement is that the application is grounded. Metal-sheathed wiring depends on bonding with the metal electrical box for grounding. Using metal-sheathed wiring with plastic electrical boxes, without taking other grounding measures, severs that ground and is highly dangerous. Electrical Code for Garage GFI Outlets and Receptacles Electrical Code for Garage GFI Outlets and Receptacles How to Plan and Installing Electrical Wiring for Garage Outlets and Lighting Circuits: Electrical Codes about GFCI protection for 15A and 20A, 125V receptacles in garages.
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