US appliances using single-phase power work between 208V and 240V so they work on both residential and commercial electrical systems.

Line-to-line voltage on a three-phase 208V system is 208V, line-to-line on 240V single-phase system is 240V.

Most commercial lighting products are rated for 120V-277V so they work on both residential and commercial (480/277V line-to-neutral single phase voltage is 277V)