Are There Specific Wiring Requirements For Parallel Generator Kits?

Wiring Size and Circuit Breaker Selection

When designing a parallel generator kit, it’s essential to choose the correct wiring size to handle the total current drawn from the connected generators. A common rule of thumb is to use a wire size that can handle at least 115% of the total current. For example, if two 30-amp generators are being paralleled, the wiring should be rated for at least 34.5 amps. Select a circuit breaker that matches the total current rating, and ensure it’s rated for the voltage of the generators. A 60-amp circuit breaker would be sufficient for the example above.

Grounding and Bonding

Proper grounding and bonding are critical in parallel generator kits to prevent electrical shock and equipment damage. The neutral point of each generator should be bonded to the system grounding point using a 6-8 AWG grounding wire, and the chassis of each generator should be bonded to the system grounding point as well. The bonding wires should be sized according to the NEC (National Electric Code) tables. It’s also essential to ensure that the system grounding point is connected to a reliable earth ground, such as a 10-foot ground rod.

Panel Board and Bus Bar Installation

The panel board and bus bar should be designed to handle the total current of the paralleled generators. The bus bar should be sized according to the total current rating of the generators and should be made of a material that can handle high currents without overheating. The panel board should be rated for the total current and voltage of the paralleled generators. It’s also essential to ensure that the panel board and bus bar are installed in a well-ventilated area and are accessible for maintenance.