Traction elevator machine rooms are located directly over the hoist way of the elevator served by that equipment. On bottom drive type, machine rooms are usually located  next to the elevator bank or bottom of the shaftway. In older installations where space is at a premium; particulary in highr-rise buildings, the machine room is often split over two levels in order to house to traction equipment , motor-generation(MG) sets and the relay controllers. Typically, and upgrade to a solid state controller and variable frequency drive ( in place of the M-G set) can free up this space for other uses.

EN 81-1   Europa Standarts
EN 81-20 Europa Standarts
EN 81-28 Remote alarm on passenger and goods passenger lifts
EN 81-70 Accessibility to lifts for persons including persons with disability
EN 81-73 Behaviour of lifts in the event of fire