Elevator installers and repairers assemble, install, and replaceelevators, escalators, moving walkways, dumbwaiters, and othervarious equipment in buildings. They start out studying a set ofblueprints that helps them decide the necessary parts for the job.They then work on scaffolding or platforms to attach the requiredmachinery and set up the electrical wires and components. Once theequipment is installed they also maintain and repair it, oiling andgreasing parts and testing different aspects of the elevators withspecial gauges. Workers have a vast knowledge of hydraulics andelectronics, as nearly all modern elevators are controlledelectronically.Most elevator installers and repairers enter into this field ofwork through the International Union of Elevator Constructors. Inorder to get an