Grounding Requirements for Portable Generators
Portable generators are internal combustion engines used to generate electricity.
They are useful when temporary or remote power is needed, and are commonly used during cleanup and recovery efforts following disasters
Major Causes of Injuries and Fatalities
• Shocks and electrocution to users from improper use.
• Shocks and electrocution to utility workers from improper connection to structures, such as residences, offices, shops and trailers. Safe Work Practices
• Maintain and operate portable generators in accordance with the manufacturer’s use and safety instructions.
• Never attach a portable generator directly to the electrical system of a structure
(home, office or trailer) unless the generator has a properly installed open transition transfer switch.
• Always plug electrical appliances and tools directly into the generator, using the appliance manufacturer’s supplied cords. Use heavy-duty extension cords that contain a grounding conductor (3-wire flexible cord
and 3-pronged cord connectors).
• Proper grounding and bonding are a means to prevent shocks and electrocutions.
• Use ground-fault circuit interrupters (GFCIs) as per the manufacturer’s instructions.
• Do not connect a generator to a structure unless the generator has a properly
installed transfer switch.
• Visually inspect the equipment before use; remove defective equipment from service;
mark or tag it as unsafe for use. If the portable generator is providing electric
power to a structure by connection via a transfer switch to a structure (home, office, shop, trailer, or similar) it must be connected to a grounding electrode system, such as a driven ground rod. The transfer switch must be approved for the use and installed in accordance with the manufacturer’s installation
instructions by a qualified electrician.
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