Nobody notices a lift’s safety systems until one of them is missing. A worn door interlock looks exactly like a working one. A single-beam sensor passes a casual test that a child’s arm would defeat. An ARD with a dead battery sits in its cabinet doing nothing at all until the night it is needed. This guide explains every core safety system, what actually holds the car when things go wrong, which features vendors present as optional that should not be, and how to check your own lift in ten minutes without opening anything.
The Core Safety Systems
Landing door interlocks
The most important device in the lift. Each landing door has a mechanical and electrical lock that does two jobs: it stops the door opening unless the car is there, and it stops the car moving unless every door is locked. Almost every serious lift accident involves a defeated or worn interlock.
Light curtains and door protection
An infrared grid across the door opening. A proper full-height curtain uses 30 to 150 beams covering the whole door. A single-beam sensor at waist height passes a hand test and misses a child’s arm, a walking stick and a dog’s lead. Ask which one you have.
Overspeed governor and safety gear
If the car exceeds a set speed, a governor rope trips a mechanism that drives steel wedges against the guide rails and clamps the car to a stop. It is entirely mechanical and works without power. This, not the ropes, is what makes free-fall a non-event in a traction lift.
Buffers
Spring or oil buffers at the bottom of the pit absorb energy if the car travels past its lowest landing. A last-resort device, tested rarely, replaced almost never — but its condition should appear in your annual report.
Overload sensing
A load cell under the car floor. When the load exceeds rated capacity, the lift refuses to move, holds the doors open and sounds a buzzer. Simple, and routinely disabled by service teams who find it “too sensitive”. Never allow that.
Automatic Rescue Device
On power failure, the ARD runs the car on battery to the nearest landing and opens the doors, usually within thirty seconds. It converts an entrapment into an inconvenience. Its weak point is the battery, which lasts two to four years and is the single most neglected component in Indian buildings.
Emergency alarm, intercom and lighting
An alarm bell audible outside the shaft, a two-way intercom to a point that is manned around the clock, and battery-backed lighting inside the car. All three, not one of three. An alarm nobody hears at 2 am is decoration.
Final limit switches and terminal slowdown
Switches near the top and bottom of travel that force the car to slow, then cut power entirely if it overshoots. They are the electrical backstop before the mechanical buffers.
Fire-recall operation
On a fire alarm signal, the lift returns to a designated landing, parks with doors open and takes itself out of normal service. Required in most commercial buildings and increasingly expected in tall residential ones.
Earthing and electrical protection
A dedicated earthing pit, correct MCB and ELCB ratings, and protection against phase failure and reversal. Unglamorous, and responsible for a large share of controller failures when done poorly.
Required vs Optional: What the Standard Actually Says
New lift installations in India fall under IS 17900, which is aligned with the European EN 81-20 and EN 81-50 series. It replaced older practice for new installations and tightened requirements around car enclosure, door strength, protective devices and control reliability. Several states additionally operate their own Lift Acts requiring registration, licensed installers and periodic inspection — the specifics differ by state, so verify locally.
Here is the practical point. Vendors compete on headline price, and the easiest way to lower a quote is to move safety items into an “optional” column. Watch for these four:
- Full-height light curtain, downgraded to a single-beam sensor
- Automatic Rescue Device, listed as an add-on
- Two-way intercom, replaced by a bell only
- Emergency cabin lighting, quietly omitted
None of these should be optional in a building where people live. A quote that lists the safety package as “as per standard” with no item list is a quote you cannot compare.
How to Verify Safety on Your Own Lift in Ten Minutes
Five checks anyone can do
- Light curtain. Ride to a floor, hold the doors open with the button, and pass a rolled-up newspaper across the opening at ankle height and at head height. The doors should react at both. If only the middle responds, you have a single-beam sensor.
- Alarm. Press it and time how long until a human responds. Do this at night once.
- Intercom. Speak into it. Confirm you can hear the other side, not just that it beeps.
- Levelling. Ride to every floor and look at the step between car and landing. Anything over 10 mm needs attention.
- Cabin lighting. Ask your technician to isolate power with someone in the car. Emergency lighting should come on immediately.
Four documents to demand
- The installation compliance certificate referencing IS 17900
- The state Lift Act registration or licence, where applicable
- The latest annual inspection report with load-test results
- The service log for the past twelve months, with readings
If a building cannot produce these, that is the finding.
What only a technician should test
Overspeed governor trip, safety gear engagement, buffer condition, brake load test, insulation resistance and earthing resistance. Never attempt these, and never enter the pit or shaft.
Rescue Readiness
If you are trapped: stay inside. The car is the safe place. Press the alarm, use the intercom, and wait. Do not try to force the doors, and never attempt to climb out through the car top — passengers exiting a stopped car cause a large share of serious lift injuries.
Building staff should: confirm contact with the passengers, reassure them continuously, call the service provider, and note the car’s position. They should not open landing doors with a release key, cut power at the panel, or attempt manual lowering unless formally trained on that specific lift.
A rescue protocol that works at 2 am has four elements: a printed contact list inside the security cabin, at least two trained staff per shift, a tested backup number when the primary line is unanswered, and a quarterly drill. Buildings that run the drill find the broken part of the chain before an emergency does.
Everyday Safety Behaviour
Passengers: do not force doors, do not overload, do not use the lift during a fire, and keep children from playing with controls.
Building management: never disable overload sensing, never allow interlocks to be bypassed for convenience, and keep the pit dry and the machine area clear.
During shifting and construction: this is when most damage happens. Doors get wedged, loads exceed rating, and dust coats the controller. Use protective cabin padding, supervise the load, and have the lift cleaned and inspected after the work ends.
Safety in Older Lifts
Pre-2020 installations commonly show four gaps: single-beam door sensors instead of full-height curtains, no ARD, no fire-recall function, and an intercom that goes to a phone nobody answers.
All four are retrofittable without replacing the lift. Light curtains and ARDs are straightforward add-ons. Fire recall usually requires controller work. An intercom re-route is a day’s job. Together they close the most dangerous gaps at a fraction of the cost of a new installation.
FAQs
Can an elevator free-fall? In practice, no. Traction lifts are suspended by multiple independent ropes, any one of which can hold the car, and an overspeed governor triggers mechanical safety gear that clamps the car to the rails without electrical power. Hydraulic lifts are supported by a column of oil that cannot vanish instantly, with rupture valves limiting descent if a hose fails.
Is an ARD legally mandatory? Requirements vary by state Lift Act and local rules, so it is not universally mandated across India. That is a legal answer, not an engineering one. In a country with routine power interruptions, a lift without an ARD is an entrapment waiting for a schedule, and we specify it as standard on every installation.
How often must a lift be inspected? Where a state Lift Act applies, statutory inspection is typically annual and tied to licence renewal. Independent of that, a lift in regular use needs monthly servicing with quarterly, half-yearly and annual deeper checks — including a documented load test each year.
Are glass and panoramic lifts less safe? No, provided the glass is specified correctly. Panels must be laminated or toughened to the impact requirements in the standard, and the same interlocks, light curtains and safety gear apply. The failure mode to watch is substituted glass on a cost-cut retrofit, not the design itself.
What is the safest thing to do if the lift stops between floors? Stay inside, press the alarm, speak on the intercom, and wait for the service team. The car is fully suspended and ventilated. The danger begins the moment someone tries to climb out or a bystander opens a landing door without training.
Conclusion
Safety in a lift is not one feature. It is a chain of independent systems, each of which has to be present, working and tested. Run the ten-minute check on your building this week, and demand the four documents.
Have Your Lift Safety Audited by Express Elevators
Express Elevators installs and services lifts across India with full-height light curtains, ARDs, tested interlocks and complete compliance documentation as standard — never as optional line items. We also audit and retrofit older installations.
Send us your lift details and installation year. We will run a safety gap check and tell you exactly what is missing.