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Pit Switches & Safety Contacts — Frequently Asked Questions
What is the difference between a pit stop switch and a pit inspection switch?
A pit stop switch is a simple on/off device that opens the safety circuit to prevent car movement — used by maintenance personnel entering the pit to ensure the elevator cannot be called while they are below. A pit inspection switch is a three-position device (normal / stop / inspection) that enables slow-speed manual movement under technician control, permitting inspection and maintenance activities on the pit equipment with the car moving at ≤ 0.3 m/s under held-to-run control.
What does EN 81-20 require for pit safety circuits?
EN 81-20 Clause 5.2.2 requires a stop switch in the pit accessible from the pit entry point, a pit inspection control device if pit inspection is performed with the car moving, and electrical safety contacts on all pit access doors confirming closure. All safety contacts must be positive-break type with direct mechanical actuation — spring-operated contacts that cannot be held closed by contact welding or jamming. Safety circuit integrity must be maintained to SIL 1 or PL c minimum.
How are pit switches affected by water ingress in basement elevator pits?
Basement elevator pits in flood-prone areas or buildings with groundwater ingress should use IP65-rated pit switch enclosures with sealed cable entries and corrosion-resistant contact materials. Turkish manufacturers offer pit switch assemblies with stainless-steel enclosures, EPDM seals, and gold-plated contacts rated for low-voltage signal switching in humid environments. Pit dewatering systems and waterproof switch mounting plates are available as complementary accessories from the same suppliers.
Can pit switches and safety contacts be tested during periodic inspections?
Yes — EN 81-20 and TS EN 13015 require functional testing of all pit safety switches and contacts at every periodic inspection. The inspector verifies that activating each switch opens the safety circuit and prevents car movement, and that contacts reset correctly when released. Testing procedures are documented in the inspection protocol and any non-functioning switch must be replaced before the elevator is returned to normal service.