(a) Minimum
Rated Load for Passenger Elevators.
(1)
The rated load in pounds for passenger elevators shall be based on the
inside net platform areas, and shall be not less than that determined by the
formulas of Design Section
3100(a).
EXCEPTION: The load rating, in pounds, of elevators
installed before June 5, 1947, providing the existing load rating is not higher
than that which can be lifted at rated speed and can be lowered within the
limits of Section
3040(f)(5).
(A) The inside net platform areas shall be
determined as shown in Figure 3037 A1. Table No. 3037 A1 and Figure No. 3037 A2
show the maximum inside net platform areas for the various common rated loads
and may be used for reference purposes.
(2) Passenger elevators shall conform to the
requirements of Design Section
3100(b) in their
design to handle overload.
(3)
The number of passengers permitted on a passenger elevator shall not
exceed the rated load in pounds, divided by 150.
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FIGURE 3037 A1
TABLE 3037 A1
Maximum Inside Net Platform Areas for the Various Rated
Loads
Rated Load
lb. |
Inside Net Platform Area sq. ft. |
|
500.......................... |
7.0 |
|
600.......................... |
8.3 |
|
700.......................... |
9.6 |
|
1,000.......................... |
13.25 |
|
1,200.......................... |
15.6 |
|
1,500.......................... |
18.9 |
|
1,800.......................... |
22.1 |
|
2,000.......................... |
24.2 |
|
2,500.......................... |
29.1 |
|
3,000.......................... |
33.7 |
|
3,500.......................... |
38.0 |
|
4,000.......................... |
42.2 |
|
4,500.......................... |
46.2 |
|
5,000.......................... |
50.0 |
|
6,000.......................... |
57.7 |
|
7,000.......................... |
65.3 |
|
8,000.......................... |
72.9 |
|
9,000.......................... |
80.5 |
|
10,000.......................... |
88.0 |
|
12,000.......................... |
103.0 |
|
15,000.......................... |
125.1 |
|
18,000.......................... |
146.9 |
|
20,000.......................... |
161.2 |
|
25,000.......................... |
196.5 |
|
30,000.......................... |
231.0 |
(4) Where partitions are installed in the
elevator cars for the purpose of restricting the platform net area for
passenger use, they shall be permanently bolted, riveted, or welded in place.
Gates, doors, or handrails shall not be used for this purpose. Partitions shall
be so installed as to provide for approximately symmetrical loading.
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(5) When freight is to be carried on a
passenger elevator, the following requirements shall be conformed to:
(A) The minimum rated load shall conform to
the requirements of Sections
3037(a) and
3037(b), whichever
is greater.
(B) The elevator shall
be designed for applicable class of freight elevator
loading.
(b)
Minimum Rated Load for Freight Elevators.
(1)
The minimum rated load for freight elevators in pounds shall be based on the
weight and class of the load to be handled, but shall in no case be less than
the following for each class of loading, based on the inside net platform area.
(A) Class A--General Freight Loading. The
rated load shall be based on not less than 50 pounds per square foot of inside
net platform area.
(B) Class
B--Motor Vehicle Loading. The rated load shall be based on no less than 30
pounds per square foot of inside net platform area.
(C) Class C. The rated load shall be based on
not less than 50 pounds per square foot of inside net platform
area.
(2) See Design
Section
3101(f)(2) for the
definitions of the various classes of freight loading.
(c) Capacity and Data Plates.
(1) Every elevator shall be provided with a
capacity plate and a data plate.
EXCEPTION: Passenger elevators not designed for
one-piece loads are not required to have a capacity plate.
Capacity plates shall be securely fastened in a
conspicuous place inside the car. Data plates shall be securely attached to the
car crosshead.
EXCEPTIONS:
1.
For underslung elevators having no crosshead, the data plate shall be located
inside the car.
2. Data plates of
elevators installed before June 5, 1947.
(2) Capacity and data plates shall have the
following information:
(A) Capacity plates
shall indicate the rated load of the elevator in pounds and, in addition, this
plate or a separate plate shall indicate:
1.
The one-piece load capacity where the elevator is designed to lift such loads
exceeding the rated load. See Section
3037(g).
2. For freight elevators designed for Class
C2 loading, the maximum load the elevator is designed to support while being
loaded or unloaded.
(B)
Data plates shall indicate:
1. The weight of
the complete car including the car safety and all auxiliary equipment attached
to the car.
2. The rated load and
speed.
3. The wire rope data
required by Section
3042(b).
4. The manufacturer's name and date of
installation.
(C) Data
plates shall be of metal and capacity plates shall be of metal or of laminated
plastic. Letters and figures shall be stamped or etched in or cast on the
surface of the plate in such a manner as to be readily legible.
The height of the letters and figures shall be not less
than:
1. One-quarter inch for
passenger elevator capacity plates where provided.
2. One inch for freight elevator capacity
plates.
3. One-eighth inch for data
plates.
(g) Carrying of
One-Piece Loads Exceeding the Rated Load. Passenger and freight elevators may
be used, where necessary, to carry one-piece loads greater than their rated
load provided they are designed, installed, and operated to conform to the
following requirements:
(1) A locking device
shall be provided which will hold the car at any landing independently of the
hoisting ropes while the car is being loaded or unloaded.
(2) The locking device shall be so designed
that it cannot be unlocked unless and until the entire weight of the car and
load is suspended on the ropes.
(3)
A removable wrench or other device shall be provided to operate the locking
device.
(4) The locking device
shall be so designed that the locking bars will be automatically withdrawn
should they come in contact with the landing locks when the car is operated in
the up direction.
(5) A special
capacity plate shall be provided inside the elevator car, and located in a
conspicuous place, which shall bear the words "CAPACITY LIFTING ONE-PIECE
LOADS," in letters followed by figures giving the special capacity in pounds
for lifting one-piece loads for which the machine is designed.
(6) The car frame, car platform, sheaves,
shafts, ropes, and locking device shall be designed for the specified "Capacity
Lifting One-Piece Loads," provided that:
(A)
In the design of the car frame, platform, sheaves, shafts, and ropes, the
allowable stresses may be 20 percent higher than those permitted for normal
loading.
(B) The factor of safety
for the locking device shall be not less than 5.
(7) The car safeties shall be designed to
stop and hold the specified "Capacity Lifting One-Piece Loads" with the ropes
intact.
(8) Where there is an
occupied space, or an unoccupied space not sealed against access under the
hoistway, the following requirements shall be conformed to:
(A) The machine shall be designed to operate
with the "Capacity Lifting One-Piece Loads" at slow speed.
(B) The car safety shall be designed to stop
and hold the car with this load independently of the hoisting ropes.
(C) The counterweight safety shall be
designed to stop and hold the entire weight of the counterweight independently
of the ropes.
(9) For
traction machines, where necessary to secure adequate traction, additional
counterweight shall be added during the period of use with one-piece loads so
that the total overbalance is at least equal to 45 percent of the "Capacity
Lifting One-Piece Loads."
(10) A
special operating device of the car-switch or constant--pressure type shall be
provided in the machine room, located near the driving machine, to operate the
elevator. When this device is operative, all other operating devices shall be
inoperative.
(11) The "Capacity
Lifting One-Piece Loads" of any passenger traction elevator shall not exceed 1-
1/3 times the rated load of the elevator.