The installation we've been discussing is, of course, governed by the NEC. The transfer switch is defined in Art. 100 as: “an automatic or non-automatic device for transferring one or more load ...

Trystar introduced a line of compact, portable Automatic Transfer Switches (ATS ... an advanced design that eliminates nearly all wiring inside the enclosure to improve reliability and reduce ...

An option for those living in these situations is a backup generator, often turned on and connected by an automatic transfer switch. These are necessary safety devices too; they keep power lines ...