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This International Standard specifies the building dimensions for the space needed to install escalators, as shown in figure 1. It applies to escalators with a maximum nominal speed of 0,5 m/s, an inclination angle of 30° or 35° and a rise from 2 m to 6 m. The machine room is a part of the truss. This International Standard does not apply to — certain escalators which are subject to special operational conditions, for which other design dimensions may be required (mainly in public traffic systems); — special designs like spiral escalators, combinations of escalators and passenger conveyors, etc. The design of escalators need not correspond to figure 1; only those dimensions indicated shall be observed.