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The elevator or escalator major alterations are the legal terms for some modifications in the existing elevators and escalators. To ensure the public safety, the elevator or escalator engineers need to arrange a examination after the major alterations.

Sometimes, elevator modernization also applied for major alterations for just replacing some critical parts of the existing elevators.[1]

For the escalator modernization, this applied for major alterations for just leave the truss in the current escalator site when replacing some critical parts[2][3], even replace the controller and the motor[4].

Common definitions of the elevator major alterations by countries

Notes and references

External links

Schindler lifts (Dewhurst fixtures 2) "This elevator only serves two floors."
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Elevator 

Drive systems: Traction • Winding Drum • Hydraulic


Types of elevators: Double DeckDumbwaiterFireman'sFreightIncline • PassengerResidentialWheelchair lift


Concept: CapacityDestination dispatchElevator algorithm • Elevator control systemElevator machine room • Elevator maintenanceElevator modernizationMachine room less elevatorMajor alterationsRated speed


Elevator systems, controllers and equipments: Elevator fixtures • Elevator keys • Elevator special modesElevator doorsDoor camDoor interlocks (Interlock wiring communication system) • Door restrictorElevator Inspection CertificateEmergency stop buttonFloor designatorsGate switch • Old Deadman controls • Overspeed governorMotor-generator set & Silicon-controlled rectifier (for DC-powered elevators) • Insulated-gate bipolar transistor (for AC-VVVF-powered elevators) • SelectorTape headRegenerative converter (for AC-VVVF-powered elevators)


See also: List of elevator fixtures guide • List of elevator and escalator companies • Elevator door sill guide (Non-proprietary elevator component door sill guide) • Floor numbering (Unlucky floor numbers) • Elevator incidents and accidents

Escalator and Moving Walkway 

Concept: Escalator control systemEscalator machinery • Spiral escalator • Escalator maintenanceEscalator modernizationMajor alterations


Escalator equipments: Escalator truss and balustradeEscalator steps and step chainsEscalator handrails • Escalator skirt brushesEmergency stop buttonEnergy-saving mode


See also: List of elevator and escalator companiesEscalator landing plate guideFloor numbering (Unlucky floor numbers) • Escalator incidents and accidents