A.
Geared hoisting machines shall be used for elevators in
buildings of eight stories or less. Gearless machines shall
be used for elevators in all buildings nine floors or more.
The placing of hoisting machines in basement machine rooms, or
in machine rooms adjacent to the hoistway, shall be limited to
special cases where conditions do not permit the installation
of overhead machines.
B.
Limited rise: Oil hydraulic direct plunger elevator equipment
shall be considered for limited rise (four stops,
approximately 14.5 m (48 foot) rise) slow speed elevators.
The machine room and pump unit shall be located adjacent to
the hoistway at the lowest landing.
C.
SCR control shall be used where elevators will be in
relatively intense service. Use of SCR control is appropriate
for unlimited applications.
1.
Single wrap geared traction configuration shall be used
for speeds up to 1.75 m/s (350 FPM).
2.
Double wrap gearless traction configuration shall be used
with speeds of 2.5 m/s (500 FPM) and greater. Roping
shall be 2:1. Secondary sheaves shall be used.
D.
Operations: In general, the following systems of operation
shall be provided for elevators:
1.
Single car selective collective operation.
2.
A two car bank of elevators shall have duplex selective
collective automatic operation.
3.
A bank of three or more elevators shall have group
automatic operation with automatic selection of method of
dispatching.
(a) For a group of three or more elevators include zone
dispatching system.
(b) Dispatching of systems shall be tailored to building
configuration and general precepts of a fully zoned
system.
E.
Special circuits, special control and emergency
requirements
should be anticipated. Possible areas for such
consideration
are surgery, intensive care, cardiac emergency,
emergency
receiving and dietary usage. Medical emergency
service may be
required.
F.
Elevator capacity and platform design: Passenger elevators
1815 kg (4,000 lb.) capacity, 2400 mm (8'0") wide by 1850 mm
(6'2") deep platform. Service elevators up to 1815 kg (4,000
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