Today residential elevator technologies give homeowners the assurance that they will get stuck in the cab during a power outage, but it was not always that way. Before battery backups and mandatory installation of telephones in home elevators (per construction code), if the electricity had an outage, traditional hydraulic or traction elevators stopped where they were immediately and suddenly. But even then, electromagnetic brakes prevented “free fall” that many homeowners are concerned about.
Since the early 1900s, elevators have been designed for rider safety. And for the last couple of decades, vacuum elevators have offered built-in design for lowering gently without battery backup. Safe descent is literally part of how a PVE works.