Manual Transfer Switches

Generator Manual Transfer Switch

A manual transfer switch connects a generator to an electrical system and isolates generator power from mains utility power. A cord plugs into a generator outlet—usually a 120/240-Volt 30-Amp or 50-Amp receptacle—and into an inlet box on the building to receive power. The inlet box connects directly to the generator manual transfer switch.

When a power outage occurs, the generator cord connects the inlet box to the generator. After the generator starts and warms up, the operator moves the manual transfer switch to the “Generator” position. The transfer switch isolates the utility first, then it connects the generator to the electrical system. Generator power can flow through the building but not the utility lines.

Manual Generator Transfer Switch Advantages

A system that uses a manual generator transfer switch has several main advantages.

• It provides a simple and safe means to use generator power at home or business.
• A transfer switch is the preferred method to power a building while meeting NEC code.
• Many utility companies and code enforcement agencies require a manual transfer switch to use a temporarily connected generator.
• The generator can power hard-wired appliances like furnaces, well pumps, water heaters, and air conditioners.
• No extension cords to run, just one cord connects to the building.

The manual transfer switch makes connecting and using a portable or mobile generator easier and safer. No extension cords to run from outside to inside the home or business—and no cords to trip over. Just plug the generator into the inlet box, start it, and move the switch to the generator position. All the connected appliances have power, including those that extension cords can’t connect like a furnace or well pump.

Even more important, a manual transfer switch meets code requirements and passes an inspection before it goes into use. Since the installation is code approved and passes inspection, utilities and insurance companies can’t cite building code violations to deny coverage or service.

Manual Transfer Switch for a Generator

The installation process requires an electrician and a building permit, and the work must pass inspection. A homeowner with the right experience and knowledge could do the work on a subpanel type installation provided the building department approves and issues a building permit after the homeowner submits a plan.

A new double circuit breaker feeds the generator manual transfer switch from the main panel. The circuits the generator will power are disconnected from the circuit breakers in the main panel and connected to new circuit breakers in the manual transfer switch. Adherence to the NEC is important for wire sizes, circuit breakers, raceway restrictions, and all other codes.