All Cold Forges are equipped with built-in Ground Fault Circuit Interrupt switches. You'll find the box under the lid to your mechanical space. There's a reset switch on the GFCI breaker in case your experience a temporary electrical fault, fix it, and then need to restore power to the Forge.
Use the 3-pronged cord that is installed in your Forge, and plug it into a standard 110V outlet that is grounded properly. That's not really anything "special".