Mine Health And Safety > C. 17. Elevators > Flashcards

C. 17. Elevators Flashcards

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0
Q

What is the definition of “hatchway”?

A

“hatchway” means any well, compartment of a shaft or winze or any vertical or inclined way in which a car or counterpoise is operated.

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1
Q

What is the definition of “elevator”?

A

“elevator” means any installation used or intended to be used for the conveyance of persons, material, explosives or mineral by means of a car fitted with safety catches running in a hatchway on fixed solid guides and serving defined landing levels, where the control system of the driving machinery is not normally operated manually from the motor or the engine room.

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2
Q

When may an elevator be used for the conveyance of persons?

A
  1. 1.1 No elevator shall be used unless a prescribed permit for its use has been issued by the Principal Inspector of Mines.
  2. 1.2 No elevator shall be used for the conveyance of persons unless it is permitted by a prescribed permit for such elevator.
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3
Q

What must the manager do when he intends to install, use or modify an elevator?

A
  1. 2.1 The manager of a mine or works who intends to install use or modify an elevator shall apply in writing to the Principal Inspector of Mines on the form obtainable from him.
  2. 2.2 The application for the installation and use of an elevator and use of an elevator shall be accompanied by-
    a) dimensioned drawings in the machine room in plan and elevation to the scale of at least 1 in 50;
    b) dimensioned drawings of the installation in plan and elevation;
    c) a diagram of all the electrical circuits of the installation; and
    d) particulars of the ropes as detailed in regulation 17.3.4(b) and of their connections.
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4
Q

What do you do when any permit is lost, defaced or destroyed?

A

17.2.5 If any permit is lost, defaced or destroyed, the manager shall apply in writing, to the Principal Inspector of Mines for the issue of a duplicate permit. The application shall have affixed to it uncancelled revenue stamps to the value of R50.

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5
Q

Where shall the permit be displayed?

A

17.2.6 The permit shall be displayed in a suitable glazed and locked or sealed frame in a conspicuous place inside the car or at any other place approved by the Principal Inspector of Mines.

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6
Q

In what shall the examinations be recorded?

A
  1. 3.1 The Principal Inspector of Mines shall provide the manager with an elevator inspection register for each elevator, in which the Principal Inspector of Mines shall record the result of each of his examinations.
  2. 3.2 The manager shall keep the register in a safe place at the mine or works.
  3. 3.3 If the register is lost, defaced or destroyed, the manager shall apply in writing to the Principal Inspector of Mines for the issue of a duplicate register. The application shall have affixed to it uncancelled revenue stamps to the value of R100.
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7
Q

What shall be entered into the Elevator Record Book?

A
  1. 3.4 The manager shall provide for each elevator an Elevator Record Book in which shall be entered-
    a) the name or names of the competent person or persons appointed to carry out the examinations prescribed in regulations 17.5.1 and 17.5.2;
    b) the following particulars of every wining rope and balance rope-

Name of manufacturer.

Date of manufacture.

Coil number

Length in metres.

Diameter in millimetres.

Mass per metre in kilograms.

Construction of rope:

            Type of lay.

            Number of strands.

            Class of heart.

Construction of strands:

            Number of wires.

            Diameter of wires in millimetres.

            Class of core.

            Class of steel in wires.

            Tensile strength of steel in megapascals.

Breaking force in kilonewtons.

Rope test certificate number and place of test.

Purpose of use.

Date put on.

Dates f recapping, shortening or turning end for end.

Date taken off.

Factor of safety (static); and

c) a true report of the result of every examination prescribed in regulations 17.5.1 and 17.5.2 and details of any repairs or alterations made. The report shall be signed by the person who carried out the inspection or effected the repairs or alterations.

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8
Q

What particulars shall be marked inside the car?

A
  1. 4.1 The following particulars shall be marked in a conspicuous place inside the car or in a place the Principal Inspector of Mines may direct-
    a) The name of the maker;
    b) The maximum mass of material or mineral permitted to be conveyed in the car;
    c) The maximum number of persons permitted to travel in the car at one time;
    d) The official number allocated to the elevator by the Principal Inspector of Mines.
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9
Q

How shall machinery where more than one elevator is installed in the same room be marked?

A

17.4.2 Where machinery of more than one elevator is installed in the same room, the machinery and switch-gear of each elevator shall be distinctly and separately marked.

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10
Q

How shall every driving motor be marked?

A

17.4.3 The driving motor of every elevator shall be distinctly marked to indicate the direction of rotation for upward and downward movement of the car.

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11
Q

What shall be displayed in the motor room?

A

17.4.4 A diagram of all the electrical circuits of the installation shall be displayed in a suitable frame in the motor room.

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12
Q

What examinations shall be done on an elevator?

A
  1. 5.1 The manager, engineer or person appointed in terms of regulation 2.13.2, shall assign any competent person to examine at least once in each week the hatchway, guides, ropes and rope attachments, the engine or motor, the drums and sheaves and all safety appliances.
  2. 5.2 An engineer or competent person appointed in terms of regulation 2.13.2 shall examine carefully, at least once in each month, the elevator and all its fittings and appliances. At this examination, the ropes supporting the elevator car and counterpoise, and the balance ropes or chains, if fitted, shall be thoroughly cleaned at selected places for the purpose of ascertaining the amount of deterioration thereof.
  3. 5.3 If as a result of examination, any weakness or defect is found whereby the safety of any person is or may be endangered, the defect shall be reported in writing without delay to the manager or an engineer or competent person appointed in terms of regulation 2.13.2 and no person shall be conveyed until the defect has been rectified.
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13
Q

How shall persons be prevented from using the elevator?

A
  1. 5.4 Adequate precautions shall be taken to prevent any person from using the elevator-
    a) while it is being operated from the motor room; or
    b) while examination, servicing or any work is being done in the hatchway.
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14
Q

What must be done when a landing door or gate is required to be open while an elevator is being examined, serviced or repaired or while any other work is being done in the hatchway?

A

17.5.5 When a landing door or gate is required to be open while an elevator is being examined, serviced or repaired or while any other work is being done in the hatchway, an effective barrier shall be provided and used to prevent inadvertent access to the hatchway.

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15
Q

What shall the Principal Inspector do when he wants to inspect an elevator?

A

17.6.1 Whenever a Principal Inspector of Mines intends inspecting an elevator he shall notify the manager of the date and time of such inspection.

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16
Q

What shall the manager do when the Principle Inspector wants to inspect an elevator?

A
  1. 6.2 The manager shall, after notification, cause all ropes and machinery to be thoroughly cleaned and prepared for the inspection.
  2. 6.3 The manager shall place free of charge at the disposal of the regional mining engineer, workmen, tools and any other equipment which are required for the purpose of carrying out an inspection.
  3. 6.4 Any manager who fails without good reason to have the elevator properly cleaned and ready for inspection on the date and at the time notified or who fails to provide the necessary facilities for the inspection, shall be guilty of an offence. The manager shall apply in writing, within 7 days of the date on which the inspection should have taken place, for a new date and time to be specified for the inspection and shall affix uncancelled revenue stamps to the value of R250 to his application.
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17
Q

What shall the Principal Inspector of Mines determine about an elevator?

A

17.7.1 The Principal Inspector of Mines shall determine the maximum number of persons and the maximum mass of material or mineral that may be conveyed by the elevator at any one time. In calculating the total mass of persons for the purpose of these regulations, 70 kilograms shall be allowed for each person.

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18
Q

May a person travel in a car when material or mineral are being conveyed?

A
  1. 7.2 Except with the written permission of the Principal Inspector of Mines, the manager shall not cause or permit any person other than an attendant or an operator to travel, an no person other than the attendant or the operator shall travel, in a car while material is being conveyed in such car.
  2. 7.3 No person shall travel in a car while mineral is being conveyed.
  3. 7.4 No person shall be conveyed in any car while material or mineral is being conveyed in a conveyance attached to such car.
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19
Q

Who may operate an elevator?

A
  1. 8.1 Every elevator shall be under the charge of and operated by a competent person, referred to as the operator, not less than 17 years of age, who shall have received training for not less than 6 shifts and who shall have been properly instructed regarding the dangers attaching to the operation of an elevator.
  2. 8.2 No person other than the operator shall operate an elevator.
  3. 8.3 The operator shall not absent himself from the elevator during the period he is in charge unless he has ensured that the elevator cannot be operated by any unauthorised person.
  4. 8.4 The operator shall be responsible for the locking of every door or gate at a landing before the car is moved from the landing. He shall cease to use the elevator should any defect be found whereby the safety of any person is or may be endangered.
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20
Q

Which provisions shall not apply to an automatic elevator arranged to be controlled by push button?

A
  1. 8.5 The provisions of regulations 17.8.1 to 17.8.4 inclusive, shall not apply to an automatic elevator arranged to be controlled by push button.
  2. 8.1 Every elevator shall be under the charge of and operated by a competent person, referred to as the operator, not less than 17 years of age, who shall have received training for not less than 6 shifts and who shall have been properly instructed regarding the dangers attaching to the operation of an elevator.
  3. 8.2 No person other than the operator shall operate an elevator.
  4. 8.3 The operator shall not absent himself from the elevator during the period he is in charge unless he has ensured that the elevator cannot be operated by any unauthorised person.
  5. 8.4 The operator shall be responsible for the locking of every door or gate at a landing before the car is moved from the landing. He shall cease to use the elevator should any defect be found whereby the safety of any person is or may be endangered.
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21
Q

How shall the hatchway of an elevator be when not enclosed by walls?

A

17.9 Where a hatchway is not enclosed by walls, access to the hatchway from any adjacent stairway, platform or floor which is not a landing shall be prevented by means of an adequate brattice or grill work to a height of at least two metres. The complete space above any hatchway landing door or gate shall be closed by bratticing or grill work. A space of not more than 40 millimetres shall be permitted between any 2 members of the bratticing or grill, work, which shall be maintained in good order.

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22
Q

How shall the doors be of an elevator?

A
  1. 10.1 Every landing entrance to the hatchway shall be provided with a substantial door or doors or a shutter-type gate or gates at least 1,8 metres in height, the inner surface of which, when closed, shall be flush, as nearly as practicable, with the inside of the hatchway.
  2. 10.2 Vertical sliding doors shall not be fitted at any landing except with the written permission of the Principal Inspector of Mines.
  3. 10.3 Except at a landing, no door shall be provided to a hatchway unless permitted or required by the Principal Inspector of Mines in writing and then only if the provisions of regulation 17.16.1 are complied with.
  4. 10.4 Where a landing door is coupled mechanically to a car door or gate for the purpose of opening or closing, a device shall be provided which automatically retracts the door or gate if it is obstructed in any way during closing. the device for closing any door or gate automatically shall be so adjusted that the force with which the door or gate closes will not cause injury to any person.
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23
Q

What devices shall be at every landing entrance to the hatchway of an automatic elevator?

A
  1. 11.1 Every landing entrance to the hatchway of an automatic elevator shall be provided with the following devices, constructed or situated so as to be inaccessible to any unauthorised person-
    a) A mechanical lock which operates in conjunction with an electrical circuit breaker arranged so that the car can be moved by power only when every landing door is closed and locked and no landing door can be opened unless the car is at rest at the landing.
    b) An additional circuit breaker arranged so that a car can be moved by power only when every landing door or gat is closed.
  2. 11.2 The circuit breakers referred to in regulation 17.11.1 shall be in 2 separate control circuits.
  3. 11.3 Where any car door or gate is coupled mechanically with a landing door or gate for the purpose of opening and closing, the provisions of regulations 17.11.1(b) shall not apply.
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24
With what shall every landing entrance to the hatchway of an elevator controlled by an operator be fitted with?
17. 11.4 Every landing entrance to the hatchway of an elevator controlled by an operator shall be fitted with- a) a substantial mechanical lock which cannot be opened from the outside unless the car is at rest at the landing; and b) a circuit breaker arranged so that the car can be moved by power only when every door or gate is closed and constructed or situated so as to be inaccessible to any unauthorised person.
25
To what regulation may a landing door be caused to open before the car comes to rest
17.11.5 Notwithstanding the provision of regulations 17.11.1 to 17.11.4 inclusive, any landing door may be caused to open before the car comes to rest at the landing, subject to the conditions prescribed under regulation 17.22.4.
26
What must happen to every door or gate opening when not in use?
17.11.6 Every door or gate opening into the hatchway shall be kept locked when not in use.
27
What does the regulation say about a car that is fitted with a lattice-type gate?
17. 12.1 Where a car is fitted with a lattice-type gate, every projection in the hatchway, including every door-lintel if the landing door is not flush with the inside of the hatchway, shall be rendered safe by a bevelled approach on the hatchway side facing the opening of the car or where possible by a suitable fascia plate. 17. 12.2 No bevel shall be less than 70 degrees to the horizontal and the bevelled surface shall be covered with smooth metal.
28
What does the regulation say about the guides of an elevator
17. 13.1 Every car and every counterpoise shall be guided throughout its travel by guides of substantial construction, securely fastened in the hatchway. 17. 13.2 The hatchway construction, the guides and the means of securing the guides, shall be able to withstand effectively the application of the safety catches as well as any other force resulting from the normal operation of the elevator. 17. 13.3 The bottom end of any guide rail shall rest on a secure foundation and shall be fixed firmly in that position. 17. 13.4 The top end of any rail shall not be fixed in the ceiling of the hatchway. 17. 13.5 No wooden guide shall be installed if the speed of the car exceeds 0,5 metres per second. 17. 13.6 No cast-iron or hollow-metal guide shall be installed. 17. 13.7 The counterpoise guides shall be enclosed by bratticing from a point 300 millimetres above the floor of the hatchway to a point at least two metres above the floor of the hatchway, except where a compensating chain or rope attached to the counterpoise precludes the use of the bratticing.
29
What shall be provided directly under every sheave at the top of the hatchway?
17.14 Directly under every sheave at the top of the hatchway, unless the sheave is separated from the hatchway by a floor of adequate strength, there shall be provided and placed a substantial grating or screen of iron or steel having a space of not more than 40 millimetres between any 2 members of the grating or screen.
30
What does the regulation say about the buffers of an elevator?
17. 15.1 Every hatchway in which the car operates at a speed of up to and including 1.8 metres per second shall be provided with spring, air or hydraulic buffers. Every hatchway in which the car operates at a speed exceeding 1.8 metres per second shall be provided with hydraulic buffers. The buffers shall be placed either at the bottom of the hatchway directly beneath both the car and the counterpoise or shall be attached to the bottom of the car and the bottom of the counterpoise. 17. 15.2 Every buffer shall be of substantial construction and the buffers shall be capable of absorbing gradually and smoothly the energy of a fully loaded car travelling at the speed at which the governor is set to trip.
31
What does the regulation say about the door that is fitted to the bottom of a hatchway and when there is no door?
17. 16.1 Where a door is fitted to give access to the bottom of a hatchway such door shall operate a circuit breaker which will prevent the elevator from working while the door is open. 17. 16.2 Where a door is not provided to give access to the bottom of the hatchway and where the floor of the hatchway is more than 1,5 metres below the bottom landing, a permanently fixed metal ladder shall be provided to give such access. 17. 16.3 One or more manually operated switches, which shall immobilise the elevator, shall be fitted in the hatchway within easy reach of the bottom landing and the floor of the hatchway.
32
What must happen with the bottom of the hatchway when 2 or more cars operate in one hatchway?
17.17 Where 2 or more cars operate in one hatchway, the bottom of the hatchway for each elevator shall be separated from the adjacent elevator or from any winding plant compartment by a wall or brattice to a height of at least two metres above the floor of the hatchway.
33
What is the clearance that shall be provided between the bottom of the hatchway and the lowest point or projection on the underside of the car when the car rests on its fully-compressed buffer?
17. 18.1 A clear space of not less than 600 millimetres shall be provided between the bottom of the hatchway and the lowest point or projection on the underside of the car when the car rests on its fully-compressed buffer, but guide shoes or rollers, safety jaw assemblies, aprons and guards need not be taken into account when determining the lowest point or projection of the car: Provided that where the car operates at a speed exceeding three metres per second the clear space shall be at least three metres. 17. 18.2 When the car rests on its fully compressed buffer, the car or any equipment attached thereto shall not come in contact with the floor of the hatchway or any part of the equipment located at the bottom of the hatchway.
34
What must the clearance be when the the car is at rest at the lowest landing and between the buffer striking plate and the face of the fully extended buffer?
17.18.3 When the car is at rest at the lowest landing there shall be a clearance of not less than 300 millimetres between the buffer striking plate and the face of the fully extended buffer.
35
What shall the clearance be at the top of the hatchway?
17.18.4 Clearance shall be provided at the top of the hatchway so that the car can travel a distance of at least one metre above the top landing without the car or any attachments thereto coming into contact with any part of the hatchway or any equipment located at the top of the hatchway: Provided that where the car operates at a speed exceeding three metres per second the clearance shall be at least three metres. When the car is resting on the fully-compressed buffer, clearance shall be provided at the top of the hatchway so that the counterpoise or any attachment thereto will not come into contact with any part of the hatchway or any equipment located therein.
36
What shall the clearance be between the elevator car and any portion of the hatchway enclosure?
17.18.5 The clearance between the elevator car and any portion of the hatchway enclosure shall be not less than 25 millimetres except on the entrance side of the car where the clearance between the car sill and the landing sill shall not be less than 10 millimetres nor more than 30 millimetres.
37
What shall the clearance be between the car and the counterpoise?
17.8.6 The clearance between the car and the counterpoise shall not be less than 50 millimetres and the clearance between the counterpoise and any portion of the hatchway enclosure shall be not less than 20 millimetres.
38
What shall the clearance be, when a counterpoise screen is fitted, between the screen and the car?
17.18.7 Where a counterpoise screen is fitted, the clearance between the screen and the car shall be not less than 25 millimetres and the clearance between the screen and the counterpoise shall not be less than 20 millimetres.
39
What shall the distance, be when the car of an automatic elevator is at rest at a landing, the distance between the leading edge of the car door or gate during closing and landing door or gate?
17.18.8 When the car of an automatic elevator is at rest at a landing, the distance between the leading edge of the car door or gate during closing and landing door or gate shall not be more than 100 millimetres.
40
When must the power supply be automatically cut off when the elevator is in the hatchway?
17.19.1 In every hatchway there shall be provided devices arranged so that the power supply to the elevator is automatically cut off when the car is in a position not more than 300 millimetres above the top landing or not more than 300 millimetres below the bottom landing. In the case of an electrically operated elevator these devices shall be so arranged that all current is cut off, independently of any other operating device, and further movement of the car under power in the direction of the overtravel is prevented.
41
What shall every hoist operating a car by means of a winding drum be fitted with to guard against overwinding?
17.19.2 Every hoist operating a car by means of a winding drum shall be provided with an automatic stopping device to guard against overwinding.
42
What does the regulation say about the sections of every counterpoise?
17.20.1 The sections of every counterpoise shall be secured together to prevent them becoming detached. The counterpoise shall be situated so that it cannot fall upon any part of the elevator or on any machinery and it shall operate in guides so that it will travel freely without danger of becoming detached.
43
With what shall the counterpoise be provided with in every building where the hatchway does not extend to the lowest floor and where the space underneath the hatchway is accessible to any person at any time
17.20.2 In every building where the hatchway does not extend to the lowest floor and where the space underneath the hatchway is accessible to any person at any time, the counterpoise shall be provided with safety catches and a circuit breaker arranged so that the power supply to the elevator is automatically cut off when the safety catches come into operation.
44
How shall every car be constructed?
17. 21.1 Every car shall be o substantial construction, enclosed on all sides which are not entrances and the top covered with a substantial roof. 17. 21.2 In every car provision shall be made for adequate ventilation through the car at all times.
45
What does the regulation say about the door or doors or a gate or gates of an elevator?
17. 22.1 Every car shall be provided with a door or doors or a gate or gates each of which shall operate an electrical circuit-breaker arranged so that the car cannot be moved by power when any door or gate is open. 17. 22.2 No car shall be fitted with a lattice-type gate except with the written permission of the Principal Inspector of Mines. 17. 22.3 Every door or gate of the car of an automatic elevator shall open and close automatically and, unless it is mechanically coupled to the landing door for the purpose of opening and closing, the car door or gate shall not start to close until the landing door or gat is closed: Provided that a lattice-type gate need not open or close automatically. 17. 22.4 Notwithstanding the Provisions of regulation 17.22.1, any door of a car may be caused to open before the car comes to rest at a landing if the car is fitted with an automatic levelling device which operates in conjunction with devices causing the doors to open when the car enters the levelling zone, provided that the levelling zone does not extend more than 400 millimetres above or below any landing, the speed of the car within the levelling zone does not exceed 0,2 metres per second, an apron of not less than 450 millimetres long is fitted to the car and, where there is a bevelled approach in terms of regulation 17.12.1, the bevelling is not less than 450 millimetres long.
46
With what shall the car of any automatic elevator which serves more than 2 landings be fitted with?
17.23 The car of any automatic elevator which serves more than 2 landings shall be fitted with a retiring cam arranged so that no manually operated landing door or gate can be opened unless the car is at rest at the landing.
47
With what shall every car be provided with?
17. 24.1 Every car shall be provided with- a) a button, marked “alarm” inside the car whereby a bell, buzzer or siren may be sounded; b) a switch, attached to the suspension beam on top of the car, to enable the car to be stopped during servicing or inspection; and c) an electric light inside the car, which shall be kept on when the elevator is available for use and when it is being serviced.
48
How shall every electric alarm and light be connected?
17.24.2 Every electric alarm and light required to be provided in terms of regulation 17.24.1 shall be connected to a circuit other than that of the power supply to the elevator driving machinery.
49
What does the regulation say about the safety catches of an elevator?
17. 25.1 Every car suspended by ropes shall be provided with efficient safety catches which, on test under static conditions, shall be capable of holding in any position in the hatchway the car together with twice the maximum authorised load. 17. 25.2 The Principal Inspector of Mines may conduct a test of the safety catches with the car in motion but shall only do so when there is no load in the car. 17. 25.3 Where safety catches are operated through shafting, any lever and every safety catch shall be keyed or welded to the shafting. 17. 25.4 A switch, arranged automatically to break the circuit controlling the power supply to the elevator when the safety catches come into operation, shall be fitted on top of the car in an accessible position. 17. 25.5 No cam type or other instantaneous grip type safety catch shall be fitted where the speed of the car is greater than one metre per second.
50
What shall be provided for every hand starting rope, rod or chain in any car through which such rope, rod or chain passes?
17.26 A suitable locking grip shall be provided for every hand starting rope, rod or chain in any car through which such rope, rod or chain passes.
51
What does the regulation say about the construction of ropes of an elevator?
17. 27.1 Every rope from which a car or counterpoise is suspended shall be of a steel wire, of good quality and sound manufacture, free from any visible defect and of adequate strength. 17. 27.2 The gauge of the wires in the rope shall be suited to the diameter of the sheave or drum over which the rope passes and the diameter of the sheave or drum shall not be less than 40 times the diameter of the rope. 17. 27.3 Every car or counterpoise operated by ropes shall be suspended by at least 2 ropes which shall be of equal diameter and strength.
52
What must the breaking force be for the ropes?
17. 27.4.1 The ropes supporting a car or counterpoise shall not be used when the estimated aggregate breaking force of all ropes supporting the car or counterpoise has become reduced to less than 10 times the effective weight-load, whichever is the greatest of- a) the combined mass of the car, its attachments, the maximum authorised load and any cable, balance rope or chain; or b) the combined mass of the counterpoise, its attachments and any balance rope or chain. 17. 27.4.2 In determining the minimum allowable breaking force of any rope used for supporting a car or counterpoise the weight in newtons of any mass carried by the rope shall be obtained by multiplying this mass in kilograms by the factor of 9,8. 17. 27.5 Before any winding or balance rope is used on an elevator, full particulars thereof as detained in regulation 17.3.4(b) shall be supplied to the Principal Inspector of Mines. 17. 27.6 The breaking force of any new winding rope or balance rope or any such rope put on anew shall be ascertained by actual test.
53
How many turns shall be on the drum where the end of any winding rope is secured to the drum?
17.28 Where the end of any winding rope is secured to the drum, there shall be at least 3 full turns of rope on the drum when the car or counterpoise has reached its limit.
54
What does the regulation say about the connections of an elevator?
17. 29.1 Every connection between a winding rope and the car, counterpoise, drum or the hatchway structure shall be designed to prevent accidental disconnection and shall have a strength not less than the breaking strength of the rope. The end of each rope shall be attached by means of an independent connection and an appliance shall be provided to distribute equally the load between the ropes. 17. 29.2 Every winding rope required to be secured to the hatchway structure shall be anchored to the beams supporting the elevator driving machine or to suitable rolled-steel sections provided for this purpose. 17. 29.3 Every connection in respect of any rope shall be renewed at intervals not exceeding 10 years or whenever the ropes are changed, whichever is the shorter period.
55
What does the regulation say about a rope which is not secured to the elevator drum or sheave?
17.30 Where a rope is not secured to the elevator drum or sheave, the construction shall be such that no dangerous slipping of the rope on the drum or sheave shall occur under any possible working condition.
56
How shall the overhead driving machinery of every elevator be supported and secured?
17. 31.1 The overhead driving machinery of every elevator shall be supported on beams constructed of rolled-steel sections or of reinforced concrete having sufficient strength to carry the total maximum loading and every end shall rest on a wall or a pillar of adequate strength. 17. 31.2 The driving machinery shall be secured in position and shall be capable of developing sufficient power to raise at least 115 percent of the maximum authorised load in the car.
57
What does the regulation say about the brakes of an elevator?
17. 32.1 Where the driving machinery is operated by a motor or by an engine, there shall be provided an efficient brake designed so as to hold the car at rest in any position in the hatchway when the car is loaded with at least 1½ times its maximum authorised load. 17. 32.2 The brake shall be constructed so that it is automatically applied when the driving machinery is not in operation and when any stopping or electrical protective device comes into operation. 17. 32.3 The brake of every electrically operated driving machine shall be arranged so that it cannot be released during normal operation before power has been applied to the driving motor.
58
What does the regulation say about the speed governor?
17. 33.1 Every car suspended by a rope shall be equipped with a speed governor to operate safety catches. 17. 33.2 Where any counterpoise is fitted with safety catches a separate speed governor to operate such safety catches shall be provided. 17. 33.3 Every speed governor for a car shall be set to trip at a speed of not less than 115 percent and not more than 140 percent of the permitted speed of the car. Where a speed governor for a counterpoise is fitted, it shall be set to trip at a speed greater than, but not more than 10 percent greater than the speed at which the governor for the car is set to trip. 17. 33.4 Where driving machinery is not governed effectively, there shall be provided a reliable speed safety device to control the speed of the machinery within safe limits.
59
How shall the electrical wiring be of every elevator?
17.34.1 Except for trailing cables, the electrical wiring of every elevator shall be in screwed conduits or ducting unless suitably sheathed cables are used.
60
Where shall the main switch of every electrical installation of every elevator be positioned?
17.34.2 Except for the lighting circuit, the electrical installation of every elevator shall be provided with a main switch in the motor room. This switch shall be placed in an easily accessible position as close to the entrance to the motor room as practicable.
61
With what shall every motor of every elevator supplied with polyphase alternating current be provided with?
17.34.3 The motor of every elevator supplied with polyphase alternating current shall be provided with a reverse phase relay or other equivalent protection to prevent the reversal of the driving motor through inadvertent reversal of the phases.
62
How shall the motor room of every elevator be?
17. 35 The motor room of every elevator- a) shall be of ample size with a clear space of not less than 600 millimetres on at least 3 sides of the machine; b) shall be at least two metres high measured from the floor to the underside of the lowest portion of the roof structure; c) shall contain only equipment which forms part of the elevator installation; d) shall not be used as a store-room for oil, grease, tools and any other material; and e) shall be kept locked except when an inspection is being made or when work in connection with the operation of the elevator is in progress. A key to the lock shall be kept readily available.
Mine Health And Safety
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