What is required for LULA elevators in terms of mechanical holding above the pit floor?

LULA (Limited Use/Limited Application) elevators have specific requirements regarding their mechanical holding features. For LULA elevators, there is a mandate that the mechanical holding device must be positioned at least 20 inches above the bottom sill of the elevator pit floor. This requirement ensures that the elevator maintains a certain level of safety and operational integrity, preventing the car from unintentionally descending below a designated safe level.

The reasoning behind this minimum height is often related to safety concerns associated with entrapments, maintenance access, and ensuring that the elevator does not fall below a critical operating zone in the pit. By establishing a clear standard, the design and operation of LULA elevators can help mitigate risks and promote safety for users and service personnel. Other choices do not meet the safety standards necessary for LULA elevators, either by specifying lower minimum heights or suggesting alternatives that do not fulfill the required safety mechanisms.