Can I Use a Transfer Switch With a Portable Generator?

Choosing the Right Transfer Switch

When using a portable generator with a transfer switch, select a switch that is specifically designed for portable generators. This type of transfer switch is typically labeled as “generator-only” or “generator-compatible.” Ensure the switch meets the National Electric Code (NEC) requirements for generator installations and is compatible with your generator’s maximum power output.

Generator Grounding and Neutral Bonding

An essential aspect of using a portable generator with a transfer switch is proper generator grounding and neutral bonding. The generator’s neutral terminal must be bonded to the generator’s grounding system, and the transfer switch’s neutral terminal must be bonded to the electrical panel’s grounding system. A 6-foot grounding cable with 4 AWG or larger wire is typically required for this connection, and the cable must be securely fastened to the generator and the electrical panel to prevent damage from heat, moisture, or physical stress.

Setting Up the Transfer Switch

When setting up the transfer switch, ensure that the generator is properly grounded and bonded, and the transfer switch is configured for the correct phase sequence (generator-neutral to panel-neutral, and generator-hot to panel-hot). Typically, this involves setting the transfer switch to the “generator” mode and verifying the generator’s voltage and frequency match the electrical panel’s specifications. It’s also crucial to follow the manufacturer’s instructions for the transfer switch and the generator to avoid any damage or safety risks.