Is IS 4666 still the active code for new lifts?

No, it was superseded by the IS 14665 series (Parts 1 to 5) around 1999/2000.

What is the minimum safety factor for passenger lift wire ropes?

The code requires a minimum safety factor of 10 for suspension ropes.

At what threshold must the safety overspeed governor activate?

It must activate at 115% of the lift's rated nominal speed.

IS 4666

: 1990

Specification for Electric Lifts

SupersededRareSpecificationBIMMEP · Lifts, Escalators and Mechanical Handling

Superseded by IS 14665 Series, then IS 17462 Series

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This standard covered the design, manufacture, dimensions, and safety requirements for electric passenger and goods lifts. It details structural provisions for lift wells and machine rooms, but has since been superseded by the comprehensive IS 14665 series.

Specifies the constructional and safety requirements for electric passenger and goods lifts (commonly referenced for older installations).

Quick Reference Values

suspension rope safety factor10 (minimum)

overspeed governor tripping speed115% of rated speed

car roof load capacity150 kg minimum

minimum clearance car and sill30 mm

Practical Notes

This code has been superseded by IS 14665 (Parts 1 to 5) and should only be referenced for evaluating older, existing elevator installations.

When inspecting legacy lifts based on this code, pay special attention to the overspeed governor and buffer conditions.

Architects must ensure the building structure can handle the dynamic loads generated by the traction machine and potential buffer impacts.