(a) Suspension Means.
All
cable-driven elevator cars and counterweights shall be suspended by steel or
iron wire ropes attached to the car frame or passing around sheaves attached to
the car frame. Ropes shall be without covering, except that marlin-covered rope
may be used where liability to excessive corrosion or other hazard
exists.
(1) Only wire rope having the
commercial classification "Elevator Wire Rope," or wire rope constructed
specifically for elevator use, shall be used for the suspension of elevator
cars and for the suspension of counterweights, including replacement of ropes
on existing elevators.
(b) Wire Rope Data on Crosshead Data Plate.
(1) The crosshead data plate required in
Section
3037(c)(2)(B)
shall bear the following wire rope data.
(A)
The number of ropes.
(B) The
diameter in inches.
(C) The
material of the ropes and the manufacturer's rated breaking strength per rope
in pounds.
(2) Whenever
new ropes are installed that do not agree in size, number, or material with the
existing data, the division shall be notified in writing before such a change
is made.
(c) Wire Rope
Data on Rope Data Tag.
(1) A metal, fiber, or
plastic tag shall be securely attached to one of the wire rope fastenings. This
data tag shall bear the following wire rope data:
(A) The diameter in inches.
(B) The manufacturer's rated breaking
strength.
(C) The grade of material
used.
(D) The month and year the
ropes were installed.
(E) Whether
nonpreformed or preformed.
(F)
Construction classification.
(G)
Name of the person or firm who installed the ropes.
(H) Name of the manufacturer of the
rope.
(2)
A new
tag shall be installed at each renewal.
(3) The height of the letters shall be not
less than
1/16
inch.
(d) Wire Rope Data
on Reshackling Tag.
(1)
Whenever wire
ropes are reshackled, a metal, fiber, or plastic tag shall be securely attached
to one of the wire rope fastenings. This tag is in addition to the tag required
in Section 3042(c). The
reshackling tag shall bear the following data:
(A)
The month and year the ropes were
reshackled.
(B)
The name of the person or firm who reshackled the
ropes.
(e) Factor of Safety.
(1) The factor of safety of the suspension
wire ropes shall be not less than that determined by the formula and graphs of
Design Section
3107(a). Table
3042E1 lists the minimum factors of safety for various intermediate rope
speeds.
TABLE NO. 3042E1
Minimum Factors of Safety for Suspension Wire
Ropes
Rope Speed in Feet
Per |
Minimum Factor of Safety |
Rope Speed in Feet Per |
Minimum Factor of Safety |
Minute |
Passenger |
Freight |
Minute |
Passenger |
Freight |
50 |
|
7.60 |
6.65 |
700 |
11.00 |
9.80 |
75 |
|
7.75 |
6.85 |
750 |
11.15 |
9.90 |
100 |
|
7.95 |
7.00 |
800 |
11.25 |
10.00 |
125 |
|
8.10 |
7.15 |
850 |
11.35 |
10.10 |
150 |
|
8.25 |
7.30 |
900 |
11.45 |
10.15 |
175 |
|
8.40 |
7.45 |
950 |
11.50 |
10.20 |
200 |
|
8.60 |
7.65 |
1000 |
11.55 |
10.30 |
225 |
|
8.75 |
7.75 |
1050 |
11.65 |
10.35 |
250 |
|
8.90 |
7.90 |
1100 |
11.70 |
10.40 |
300 |
|
9.20 |
8.20 |
1150 |
11.75 |
10.45 |
350 |
|
9.50 |
8.45 |
1200 |
11.80 |
10.50 |
400 |
|
9.75 |
8.70 |
1250 |
11.80 |
10.50 |
450 |
|
10.00 |
8.90 |
1300 |
11.85 |
10.55 |
500 |
|
10.25 |
9.15 |
1350 |
11.85 |
10.55 |
550 |
|
10.45 |
9.30 |
1400 |
11.90 |
10.55 |
600 |
|
10.70 |
9.50 |
1450 |
11.90 |
10.55 |
650 |
|
10.85 |
9.65 |
1500 |
11.90 |
10.55 |
(2)
The factor of safety of
replacement ropes for existing elevators shall be not less than the factor of
safety of the original ropes based on their original breaking
strength.
(f)
Minimum Number and Diameter of Hoisting Ropes.
(1)
The minimum number of hoisting
ropes used shall be three for traction elevators, and two for drum-type
elevators.
EXCEPTION: Existing traction elevators with two
hoisting ropes.
(2)
Where a car counterweight or a drum counterweight is used, the number
of counterweight ropes used shall be not less than two.
(3)
The minimum diameter of hoisting
and counterweight ropes shall be 3/8 -in. (9.5 mm). Outer wires of the ropes
shall be not less than 0.024 in. (0.61 mm) in diameter.
The term "diameter," where used in this section, shall
refer to the nominal diameter as given by the rope manufacturer.
(Title 24, Part 7, Section
7-0342.)
(g) Suspension Rope Equalizers.
(1) Suspension rope equalizers, where
provided, shall be of the individual-compression spring type.
EXCEPTION: Equalizers of other types may be used with
traction elevators provided the equalizers and their fastenings are accepted by
the division; and provided that equalizers of the single-bar type or springs in
tension shall not be used to attach suspension ropes to cars or counterweights
or to dead-end hitch plates. See Design Section
3107(d).
(2)
Equalizers shall be used on the
car and counterweight ends of all ropes of overhead drum-type elevators where
the ropes travel in opposite directions on the drum
face.
(h)
Securing of Wire Suspension Ropes to Winding Drums.
(1)
Car and counterweight suspension
ropes of winding drum machines shall have the drum ends of the ropes secured on
the inside of the drum by clamps or by tapered babbitted
sockets.
(2)
Wire
suspension ropes of drum-type machines shall have not less than one turn of
each rope on the drum when the car or counterweight is resting on the fully
compressed buffers.
(i) Replacement and Reshackling of Suspension
and Compensation Ropes.
(1)
When wear,
corrosion, broken wires, or other factors indicate that ropes or cables have
their breaking strength materially reduced below the manufacturer's rating,
they shall be renewed.
(2)
When hoisting or counterweight ropes are renewed, the entire set shall
be renewed. A set of rope in this case shall mean all of the hoisting ropes, or
all of the car counterweight ropes, or all of the drum counterweight
ropes.
(3)
Suspension wire ropes or compensating ropes shall not be lengthened or
repaired by splicing.
(4)
When suspension ropes are renewed, the method of babbitting shall
conform to the requirements of Sections
3042(j)(5),
3042(j)(6), and
3042(j)(7).
(5)
The hoisting ropes of power
elevators having drum-type driving machines with one-to-one (1:1) roping shall
be reshackled at the car ends when an inspection shows any evidence of fatigue
or abrasion, and in no case at intervals longer than indicated in the following
schedule.
|
Frequency in years |
O.H. Drum, Heavy Duty (Over 50 trips per
day).......................... |
..........................1 |
O.H. Drum, Medium Duty (25-50 trips per
day).......................... |
..........................2 |
O.H. Drum, Light Duty (Less than 25 trips per
day).......................... |
..........................4 |
Basement Drum, Heavy Duty (Over 50 trips per
day).......................... |
..........................2 |
Basement Drum, Medium Duty (25-50 trips per
day).......................... |
..........................4 |
Basement Drum, Light Duty (Less than 25 trips per
day).......................... |
..........................6 |
EXCEPTION: In lieu of reshackling, the division will
accept an auxiliary rope-fastening device which meets the requirements of
Section 3042(k).
(A)
At the time of this reshackling,
a careful inspection shall be made of other shackles, particularly at the drum
counterweight ends with the weights landed and the rope slack. These ends shall
be reshackled if they show any evidence of fatigue or
abrasion.
(B) See Section
3042(d) for the
data required on the reshackling tag.
(j) Hoisting Rope Fastenings.
(1) The car and counterweight ends of car and
counterweight wire ropes, or the stationary hitch-ends where multiple roping is
used, shall be fastened in such a manner that all portions of the rope, except
the portion inside the rope sockets, shall be readily visible.
Fastening shall be:
(A)
By individual tapered babbitted
rope sockets. See Design Section
3107(b)(1).
(B)
By other types of rope fastenings
accepted by the division provided that U-bolt-type rope clips (clamps) shall
not be used for such fastenings. See Design Section
3107(b)(2).
(2) The car ends, or the car or counterweight
dead ends where multiple roping is used, of all suspension wire ropes of
traction-type elevators shall be provided with shackle rods of a design which
will permit individual adjustment of the rope lengths. Similar shackle rods
shall be provided on the car or counterweight ends of compensating
ropes.
(3) Hoisting rope fastenings
shall conform to the following:
(A) The
portion of the rope fastening which holds the wire rope (rope socket) and the
shackle rod may be in one piece (unit construction) or they may be
separate.
(B) The rope socket shall
be either cast or forged steel provided that where the rope socket and the
shackle rod are in one piece (unit construction), the entire fastening shall be
of forged steel. See Design Section
3107(b).
(C) Where the shackle rod and the rope socket
are not in one piece, the shackle rod shall be of forged or rolled
steel.
(D) Where the shackle rod is
separate from the rope socket, the fastening between the two parts shall be
positive and such as to prevent their separation under all conditions of
operation of the elevator. Where the connection of the two parts is threaded,
the length of the thread engagement of the rod in the socket shall be not less
than
11/2 times
the root diameter of the thread on the rod, and a cotter pin or equivalent
means shall, in addition, be provided to restrict the turning of the rod in the
socket and prevent unscrewing of the connection in normal operation.
(E) Rope fastenings incorporating
antifriction devices which will permit free spinning of the rope shall not be
used.
(F)
Where hoisting or
car counterweight ropes pass through plates at the hitchblock or car crosshead,
said plates shall be chamfered, and free from sharp
projections.
(4)
Tapered babbitted-type rope sockets shall be of design as shown in Figure 3107
and shall conform to the requirements of Design Section
3107(b).
(5) Only babbitt metal shall be used to
secure ropes in tapered babbitted sockets. Babbitt metal shall contain at least
9 percent of antimony and shall be clean and free from dross.
(6) Where the tapered babbitted-type of
socket is used, the method and procedure to be followed in making up the
fastening shall conform to that outlined in Design Section
3107(c).
(7) When the babbitt has cooled and the tape
at the small end removed, a visual inspection shall be made which shall show
that:
(A) The babbitt is visible at the small
end of the socket.
(B) The tops of
the looped strands of the rope are just visible above the surface of the
babbitt. Where rope wih steel core is used, the steel core shall also be
visible above the surface of the babbitt.
(C) No loss of rope lay has occurred where
the wire rope enters the basket. Babbitted sockets which do not conform to the
above requirement shall be rejected and the rope
resocketed.
(k)
Auxiliary Rope Fastening Device. Auxiliary rope-fastening devices, designed to
support elevator cars or counterweights if any regular rope fastening fails,
may be provided subject to the following requirements:
(1) They shall be accepted by the division on
the basis of adequate tensile and fatigue test made by an approved testing
laboratory.
(2) The device and its
fastenings, in its several parts and assembly, shall have a strength at least
equal to that of the manufacturer's breaking strength of the rope to which it
is to be attached.
(3) The device
shall be so designed and installed that:
(A)
It will not become operative unless there is a failure of normal rope
fastening.
(B) It will function in
a rope movement of not over
11/2
inches.
(C) It will not interfere
with the vertical or rotational movements of the rope during normal
service.
(4) Means shall
be provided to cause the electric power to be removed from the hoisting machine
motor and brake when any auxiliary fastening device operates. Such means shall
be of the manually reset type.
(5)
The method used to attach the device to the rope shall be such as to prevent
injury to or appreciable deformation of the rope.
(6) The installation of the device shall not
reduce the required overhead clearances.
(7) Each device shall be permanently marked
with the name of the manufacturer and with the size of the wire rope for which
they are designed to be used.
Notes
Cal. Code Regs. Tit. 8, §
3042
1.
Amendment of subsection (f) filed 6-11-86; effective thirtieth day thereafter
(Register 86, No. 24).
2. Editorial correction of subsection
(k)(3)(C) (Register 95, No. 32).
Note: Authority cited: Section
142.3, Labor
Code. Reference: Section
142.3, Labor
Code.
1. Amendment of
subsection (f) filed 6-11-86; effective thirtieth day thereafter (Register 86,
No. 24).
2. Editorial correction of subsection (k)(3)(C) (Register
95, No. 32).
Group II regulations apply to existing elevators
installed prior to October 25, 1998. Italicized paragraphs, sentences, or
phrases apply to all existing elevators while non-italicized apply to elevators
installed after 1970 or after the date the regulation was
adopted.