Most important, low-voltage equipment is easier to install. Except for the transformer that's connected to a 120-volt circuit, the entire system runs on harmless 12-volt current.

Low-voltage deck lighting systems do this well and they’re safe and easy to work with. Unlike with standard household voltage, the transformer that powers them simply plugs into a receptacle.

Transformer: The power behind every low-voltage system is the transformer. It plugs into a GFCI-protected outdoor electrical outlet and steps down the house current from 120 volts to 12 volts.