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IS 14666:1999 is the Indian Standard (BIS) for guide rails for lifts. This standard specifies the material requirements, dimensions, sectional properties, tolerances, and surface finish for both machined and cold-drawn steel guide rails used for lift cars and counterweights. It also provides a designation system for ordering and includes calculation principles for ensuring the rails can withstand operational and safety-gear-related forces.
Specifies the requirements for T-section metallic guide rails for lifts, including their dimensions and tolerances.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! The choice between machined (T-profile) and cold-drawn rails depends on the lift's speed, capacity, and required ride quality; cold-drawn rails offer tighter tolerances and better finish.
! Correctly specifying the rail designation (e.g., 'T 89/B' or 'CD 01') as per Clause 6 is crucial to procure the correct profile and material grade.
! Verification of surface roughness (Clause 5.4) on guiding surfaces is critical as it directly affects ride comfort, noise levels, and the lifespan of guide shoes.
ISO 7465:2024International Organization for Standardization (ISO), International
HighCurrent
Lifts and service lifts — Guide rails for lift cars and counterweights — T-type
Directly equivalent standard for T-type guide rails, covering dimensions, materials, and tolerances.
EN 81-20:2020European Committee for Standardization (CEN), Europe
HighCurrent
Safety rules for the construction and installation of lifts - Lifts for the transport of persons and goods - Part 20: Passenger and goods passenger lifts
A comprehensive lift safety standard with specific sections (e.g., 5.6) detailing requirements for guide rails, often referencing ISO 7465.
ASME A17.1-2019 / CSA B44-19American Society of Mechanical Engineers / Canadian Standards Association, USA/Canada
MediumCurrent
Safety Code for Elevators and Escalators
A broad safety code with requirements for guide rails (Section 2.23) that differ in material specifications and calculation methods.
JIS A 4304:2016Japanese Industrial Standards (JIS), Japan
HighCurrent
Guide rails for elevators
Dedicated Japanese standard for elevator guide rails, largely harmonized with ISO 7465.
Key Differences
≠IS 14666 explicitly specifies Indian steel grades (e.g., Fe 360 from IS 2062), whereas international standards reference their respective national or international material grades (e.g., ASTM, EN, or ISO grades).
≠Dimensional tolerances can vary. For instance, the tolerance on the width of the guiding surface (b1) for some T-profiles is tighter in ISO 7465 (e.g., ±0.05 mm) compared to IS 14666 (e.g., ±0.1 mm).
≠IS 14666 is a standalone guide for guide rails only. In contrast, EN 81-20 and ASME A17.1 are comprehensive safety codes where guide rail requirements are integrated within a much larger set of rules for the entire lift system.
≠The specified surface roughness for machined guide rails is stricter in ISO 7465 (Ra ≤ 1.6 µm) than in IS 14666 (Ra ≤ 3.2 µm), potentially affecting ride quality and guide shoe wear.
Key Similarities
≈All standards are based on the fundamental 'T-profile' geometry for lift car and counterweight guide rails.
≈Both IS 14666 and its international counterparts recognize the two primary manufacturing methods: cold-drawn and machined (planed), and specify different requirements for each.
≈There is a common emphasis on defining and controlling key mechanical properties, such as minimum tensile strength and yield stress, which are crucial for safety calculations.
≈All standards mandate stringent checks on dimensional accuracy, straightness, and squareness to ensure proper alignment and safe, smooth operation of the elevator.
≈The standard length for a guide rail section is consistently specified as 5000 mm (5 meters) across IS 14666 and most international standards, facilitating interchangeability and planning.
What is the standard material for lift guide rails?+
Drawn steel with a minimum tensile strength typically of 370 N/mm² or 520 N/mm², as specified in Clause 4.1.
What does the designation 'T 89/B' signify?+
It indicates a machined ('T') guide rail with a head width of 89 mm and belonging to the 'B' profile type (Clause 6.1).
What is the permissible straightness tolerance for guide rails?+
For machined rails, it is 1 mm per 5 m length (Table 3). For cold-drawn rails, it is 0.5 mm per 5 m length (Table 4).
Does this standard cover calculations for guide rails?+
Yes, Annex A provides principles and formulas for calculating stresses and deflections in guide rails under various load cases, including safety gear operation.