Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 7 - ELEVATORS, LIFTS, ESCALATORS, DUMBWAITERS, HOISTS ANDTRAMWAYS › Subchapter I - FREIGHT ELEVATORS › GENERAL REQUIREMENTS › Section 7.280 - Cables

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Number
					 required.
At least two hoisting and two counterweight cables shall be
					 provided on all new freight elevators raised and lowered by cables. At least
					 three hoisting cables shall be used on new traction-type freight elevators. The
					 operation of existing elevators having only one hoisting cable is prohibited
					 unless the diameter and material of the cable is adequate to safely carry the
					 maximum load with a factor of safety as designated in subsection (c), and if
					 the elevator car is equipped with approved car safeties.
(b)
Material and diameter.
Hoisting and counterweight cables shall be made of iron or steel of good
					 quality. The minimum diameter permitted for any type of cable is 1/2 inch. When
					 different diameters of cables than those given in subsection (c) are necessary,
					 they shall be computed on the same ratio as shown in that subsection. When the
					 material of existing hoisting and counterweight cables is unknown, such cables
					 shall be assumed to be of iron and the lifting capacity of the installation
					 calculated accordingly.
(c)
Factors of safety.
No hoist or counterweight cable shall be
					 stressed beyond a factor of safety as follows:
Cable Speed(in feet per
								  minute)
Factor of Safty
50
6.65
100
7.00
150
7.30
200
7.65
250
7.90
300
8.20
350
8.45
400
8.70
450
8.90
500
9.15
600
9.50
700
9.80
800
10.00
900
10.15
1000
10.30
1200
10.50
1400
10.55
1500
10.55
(d)
Cable fastenings.
Only
					 approved types of cable fastenings shall be used.
(e)
Cables located outside of
					 shaftways.
When the installation of an elevator requires cables to
					 pass through the floors outside of the elevator shaftways, they shall be boxed
					 on all sides with solid enclosures, or standard metal guards shall be provided
					 to a height of at least 6 feet.
(f)
Diameters of sheaves and drums.
The diameters of drums and
					 sheaves in new installations shall be at least 40 times the diameter of the
					 cable used, except for sidewalk elevators. Drum and sheave diameters in
					 existing installations may be accepted, except where changes are considered
					 necessary by the Department.
(g)
Number of turns of cables.
There shall be at least 1 1/2 wraps
					 of hoisting and counterweight cables on the drums of freight elevators of the
					 winding drum type when either the car or counterweights are at the limits of
					 travel. The ends of the cables shall be clamped on the inside of the
					 drum.
(h)
Cable equalizers.
Cables shall be provided with a means of equalizing. Drum-type
					 elevators shall be provided with eveners. On existing installations the
					 requirements for cable equalizers need not be complied with until the next
					 cable renewal. Such equalizers shall be fastened in position by thrubolts, each
					 bolt to be provided with a nut, locknut and cotterpin. Coil or helical springs,
					 when used, shall be of a design which will not permit full compression under
					 normal load.
(i)
Reshackling.
The car hoist and drum counterweights ropes of
					 power-driven elevators having drum-type driving machines shall be reshackled
					 every two years, except where auxiliary rope fastening devices are installed.
					 Reshackling is required when the auxiliary rope fastener indicates failure of
					 any rope fastening. Crosby clips and heart shackles shall be included.
					 Two-to-one roped underslung drum elevators are exempted. A metal tag shall be
					 placed on the rope to show the reshackling date and the person who performed
					 the work.
(j)
Metal data
					 tags.
A metal data tag shall be securely attached to one of the wire
					 rope fastenings and a new tag shall be installed at each rope renewal. Data tag
					 shall bear the following:
(1) The diameter in
					 inches.
(2) The rated breaking
					 strength, as rated by the manufacturer.
(3) The grade of material used.
(4) The month and year the ropes were
					 installed.
(5) Whether the ropes
					 were nonpreformed or performed.
(6)
					 The construction classification.
(7) The name of the person or firm who
					 installed the ropes.
(8) The name
					 of the manufacturer of the rope.