Fixed to a wall; as in a bypass. See bypass. UPS power supplies systems; regardless of manufacturer all have an internal bypass to bypass the mains incoming supply. PowerContinuity systems always installs an external bypass as well which is wall mounted to allow safe removal of a UPS and safe internal working on a UPS. Health and Safety is at the forefront of our best working practice. Continuous power bypasses the national grid to provide true power protection. Every T2000 UPS has an internal bypass and an external bypass for your safety, as well as a wall mounted bypass. Power Protection for businesscontinuity.