I'm hoping someone can shed some light on "voltage" ratings for outlets, switches and appliances. I've read that for all practical considerations, that an outlet or switch rated at 110v 20 amp, versus 115v 20 amp, versus 120v 20 amp are equivalent. Such that if you install outlets that are rated 110v 20 amp, you are safe to use them to power motors spec'd at 120v 20 amp.