Перевести.The mechanical and electrical design of elevators is dictated according to

Перевести.
The mechanical and electrical design of elevators is dictated according to various standards (aka elevator codes), which may be international, national, state, regional or city based. Whereas once many standards were prescriptive, specifying exact criteria which must be completed with, there has recently been a shift towards more performance-based standards where the onus falls on the designer to ensure that the elevator meets or exceeds the standard.
National elevator standards:
Australia - AS 1735 elevators have been recognized in the 2005 supplement to the 2004 A 17.1 Elevator Code.
Today, some machine room less hydraulic elevators by Otis and ThyssenKrupp exist; they do not involve the use of a piston located underground or a machine room, mitigating environmental concerns; however, code is not yet accepting of them in all part of the United States.