Michigan Administrative Code › Department - Labor and Economic Opportunity › MIOSHA › General Industry and Construction Safety and Occupational Health Standards › General Industry Safety Standards › Part 5 - POWERED PLATFORMS FOR BUILDING MAINTENANCE › MAINTENANCE › Appendix D - EXISTING INSTALLATIONS MANDATORY

Current through Vol. 24-12, July 15, 2024
Use of the Appendix
Appendix D sets out the mandatory building and
						  equipment requirements for applicable permanent installations completed after
						  August 27, 1971, and no later than July 23, 1990, which are exempt from
						  R
						  408.10501,
						  R
						  408.10502,
						  R
						  408.10503 to
						  R
						  408.10508, R 408.10518,
						  R
						  408.10561 to
						  R
						  408.10567,
						  R
						  408.10568 to
						  R
						  408.10569, and
						  R
						  408.10575 to
						  R 408.10577 of this
						  standard.
The requirements in Appendix D are essentially the same
						  as unrevised building and equipment provisions which previously were designated
						  as R
						  408.10501,
						  R
						  408.10502, R 408.10518, and
						  R
						  408.10503 to
						  R
						  408.10508, and which were effective on November 1,
						  1974.
Note: All existing installations subject to this
						  appendix shall also comply with
						  R
						  408.10574(2),
						  R
						  408.10578 to
						  R 408.10582, and
						  R 408.10585 to
						  R
						  408.10592 of this standard.
(A) "DEFINITIONS APPLICABLE TO THIS APPENDIX"
(1) "Angulated roping." A system of platform suspension
						  in which the upper wire rope sheaves or suspension points are closer to the
						  plane of the building face than the corresponding attachment points on the
						  platform, thus causing the platform to press against the face of the building
						  during its vertical travel.
(2) "ANSI" American National Standards
						  Institute.
(3) "Babbitted fastenings." The method of providing
						  wire rope attachments in which the ends of the wire strands are bent back and
						  are held in a tapered socket by means of poured molten babbitt metal.
(4) "Brake" - "disc type." A brake in which the holding
						  effect is obtained by frictional resistance between 1 or more faces of discs
						  keyed to the rotating member to be held and fixed discs keyed to the stationary
						  or housing member (pressure between the discs being applied axially).
(5) "Brake - self-energizing band type." An essentially
						  unidirectional brake in which the holding effect is obtained by the snubbing
						  action of a flexible band wrapped about a cylindrical wheel or drum affixed to
						  the rotating member to be held, the connections and linkages being so arranged
						  that the motion of the brake wheel or drum will act to increase the tension or
						  holding force of the band.
(6) "Brake - shoe type." A brake in which the holding
						  effect is obtained by applying the direct pressure of 2 or more segmental
						  friction elements held to a stationary member against a cylindrical wheel or
						  drum affixed to the rotating member to be held.
(7) "Building face rollers." A specialized form of
						  guide roller designed to contact a portion of the outer face or wall structure
						  of the building, and to assist in stabilizing the operators' platform during
						  vertical travel.
(8) "Continuous pressure." Operation by means of
						  buttons or switches, any 1 of which may be used to control the movement of the
						  working platform or roof car, only as long as the button or switch is manually
						  maintained in the actuating position.
(9) "Control." A system governing starting, stopping,
						  direction, acceleration, speed, and retardation of moving members.
(10) "Controller." A device or group of devices,
						  usually contained in a single enclosure, that serves to control in some
						  predetermined manner the apparatus to which it is connected.
(11) "Electrical ground." A conducting connection
						  between an electrical circuit or equipment and the earth, or some conducting
						  body which serves in place of the earth.
(12) "Guide roller." A rotating, bearing-mounted,
						  generally cylindrical member, operating separately or as part of a guide shoe
						  assembly, attached to the platform, and providing rolling contact with building
						  guideways, or other building contact members.
(13) "Guide shoe." An assembly of rollers, slide
						  members, or the equivalent, attached as a unit to the operators' platform, and
						  designed to engage with the building members provided for the vertical guidance
						  of the operators' platform.
(14) "Interlock." A device actuated by the operation of
						  some other device with which it is directly associated, to govern succeeding
						  operations of the same or allied devices.
(15) "Operating device." A pushbutton, lever, or other
						  manual device used to actuate a control.
(16) "Powered platform." Equipment to provide access to
						  the exterior of a building for maintenance, consisting of a suspended
						  power-operated working platform, a roof car, or other suspension means, and the
						  requisite operating and control devices.
(17) "Rated load." The combined weight of employees,
						  tools, equipment, and other material which the working platform is designed and
						  installed to lift.
(18) "Relay, direction." An electrically energized
						  contactor responsive to an initiating control circuit, which in turn causes a
						  moving member to travel in a particular direction.
(19) "Relay, potential for vertical travel." An
						  electrically energized contactor responsive to initiating control circuit,
						  which in turn controls the operation of a moving member in both directions.
						  This relay usually operates in conjunction with direction relays, as covered
						  under the definition, "relay, direction."
(20) "Roof car." A structure for the suspension of a
						  working platform, providing for its horizontal movement to working
						  positions.
(21) "Roof-powered platform." A powered platform having
						  the raising and lowering mechanism located on a roof car.
(22) "Self-powered platform." A powered platform having
						  the raising and lowering mechanism located on the working platform.
(23) "Traveling cable." A cable made up of electrical
						  or communication conductors or both, and providing electrical connection
						  between the working platform and the roof car or other fixed point.
(24) "Weatherproof." Equipment so constructed or
						  protected that exposure to the weather will not interfere with its proper
						  operation.
(25) "Working platform." The suspended structure
						  arranged for vertical travel that provides access to the exterior of the
						  building or structure.
(26) "Yield point." The stress at which the material
						  exhibits a permanent set of 0.2 percent.
(27) "Zinced fastenings." The method of providing wire
						  rope attachments in which the splayed or fanned wire ends are held in a tapered
						  socket by means of poured molten zinc.
(B) "GENERAL REQUIREMENTS"
(1) "Design requirements." All powered platform
						  installations for exterior building maintenance completed as of August 27,
						  1971, but not later than 180 days after November 1, 1974, shall meet all of the
						  design, construction, and installation requirements of Part II and III of ANSI
						  A120.1 "Safety Requirement for Powered Platforms for Exterior Building
						  Maintenance," 1970 edition, as adopted in R 408.40509, and of this appendix.
						  References shall be made to appropriate parts of ANSI A120.1 1970 edition for
						  detail specifications for equipment and special installations.
(2) "Limitation." The requirements of this appendix
						  apply only to electric powered platforms. It is not the intent of this appendix
						  to prohibit the use of other types of power. Installation of powered platforms
						  using other types of power is permitted, provided such platforms have adequate
						  protective devices for the type of power used, and otherwise provide for
						  reasonable safety of life and limb to users of equipment and to others who may
						  be exposed.
(3) "Types of powered platforms."
(i) For the purpose of applying this appendix, powered
						  platforms are divided into 2 basic types, Type F and Type T.
(ii) Powered platforms designated as Type F shall meet
						  all the requirements in Part II of ANSI A120.1 "Safety Requirement for Powered
						  Platforms for Exterior Building Maintenance," 1970 edition, as adopted in R
						  408.40509. A basic requirement of Type F equipment is that the work platform is
						  suspended by at least 4 wire ropes and designed so that failure of any 1 wire
						  rope will not substantially alter the normal position of the working platform.
						  Another basic requirement of Type F equipment is that only 1 layer of hoisting
						  rope is permitted on winding drums. Type F powered platforms may be either
						  roof-powered or self-powered.
(iii) Powered platforms designated as Type T shall meet
						  all the requirements in Part III of ANSI A120.1 "Safety Requirement for Powered
						  Platforms for Exterior Building Maintenance," except for section 28, "Safety
						  Belts and Life Lines," 1970 edition, as adopted in R 408.40509. A basic
						  requirement of Type T equipment is that the working platform is suspended by at
						  least 2 wire ropes. Failure of 1 wire rope would not permit the working
						  platform to fall to the ground, but would upset its normal position. Type T
						  powered platforms may be either roof-powered or self-powered.
(iv) The requirements of this section apply to powered
						  platforms with winding drum type hoisting machines. It is not the intent of
						  this section to prohibit powered platforms using other types of hoisting
						  machines such as, but not limited to, traction drum hoisting machines, air
						  powered machines, hydraulic powered machines, and internal combustion machines.
						  Installation of powered platforms with other types of hoisting machines is
						  permitted, provided adequate protective devices are used, and provided
						  reasonable safety of life and limb to users of the equipment and to others who
						  may be exposed is assured.
(v) Both Type F and Type T powered platforms shall
						  comply with the requirements of Appendix C of this rule.
(C) "TYPE F POWERED PLATFORMS"
(1) "Roof car, general."
(i) A roof car shall be provided whenever it is
						  necessary to move the working platform horizontally to working or storage
						  positions.
(ii) The maximum rated speed at which a power traversed
						  roof car may be moved in a horizontal direction shall be 50 feet per
						  minute.
(2) "Movement and positioning of roof car."
(i) Provision shall be made to protect against having
						  the roof car leave the roof or enter roof areas not designed for travel.
(ii) The horizontal motion of the roof cars shall be
						  positively controlled so as to ensure proper movement and positioning of the
						  roof car.
(iii) Roof car positioning devices shall be provided to
						  ensure that the working platform is placed and retained in proper position for
						  vertical travel and during storage.
(iv) Mechanical stops shall be provided to prevent the
						  traversing of the roof car beyond its normal limits of travel. Such stops shall
						  be capable of withstanding a force equal to 100 percent of the inertial effect
						  of the roof car in motion with traversing power applied.
(v)(a) The operating device of a power-operated roof
						  car for traversing shall be located on the roof car, the working platform, or
						  both, and shall be of the continuous pressure weatherproof electric type. If
						  more than 1 operating device is provided, the operating device shall be so
						  arranged that traversing is possible only from 1 operating device at a
						  time.
(b) The operating device shall be so connected that it
						  is not operable until both of the following:
(1) The working platform is located at its uppermost
						  position of travel and is not in contact with the building face or fixed
						  vertical guides in the face of the building; and
(2) All protective devices and interlocks are in a
						  position for traversing.
(3) "Roof car stability." Roof car stability shall be
						  determined by either paragraph (c)(3)(i) or (ii) of this appendix, whichever is
						  greater.
(i) The roof car shall be continuously stable,
						  considering overturning moment as determined by 125 percent rated load, plus
						  maximum dead load and the prescribed wind loading.
(ii) The roof car and its anchorages shall be capable
						  of resisting accidental over-tensioning of the wire ropes suspending the
						  working platform and this calculated value shall include the effect of 1 1/2
						  times the value. For this calculation, the simultaneous effect of 1/2 wind load
						  shall be included, and the design stresses shall not exceed those referred to
						  in paragraph (b)(1) of this appendix.
(iii) If the load on the motors is at any time in
						  excess of 3 times that required for lifting the working platform with its rated
						  load, the motor shall stall.
(4)"Access to the roof car." Safe access to the roof
						  car and from the roof car to the working platform shall be provided. If the
						  access to the roof car at any point of its travel is not over the roof area or
						  where otherwise necessary for safety, then self-closing, self-locking gates
						  shall be provided. Access to and from roof cars shall comply with the
						  requirements of General Industry Safety and Health Standard Part 2
						  "Walking-Working Surfaces," as referenced in
						  R
						  408.10509.
(5) "Means for maintenance, repair, and storage." Means
						  shall be provided to run the roof car away from the roof perimeter, where
						  necessary, and to provide a safe area for maintenance, repairs, and storage.
						  Provisions shall be made to secure the machine in the stored position. For
						  stored machines subject to wind forces, see special design and anchorage
						  requirements for "wind forces" in Part II, section 10.5.1.1 of ANSI A120.1
						  "Safety Requirement for Powered Platforms for Exterior Building Maintenance,"
						  1970 edition, as adopted in R 408.40509.
(6) "General requirements for working platforms." The
						  working platform shall be of girder or truss construction and shall be adequate
						  to support its rated load under any position of loading, and comply with the
						  provisions set forth in section 10 of ANSI A120.1 "Safety Requirement for
						  Powered Platforms for Exterior Building Maintenance," 1970 edition, as adopted
						  in R 408.40509,
(7) "Load rating plate." Each working platform shall
						  bear a manufacturer's load rating plate, conspicuously posted; stating the
						  maximum permissible rated load. Load rating plates shall be made of
						  noncorrosive material and shall have letters and figures stamped, etched, or
						  cast on the surface. The minimum height of the letters and figures shall be 1/4
						  inch.
(8) "Minimum size." The working platform shall have a
						  minimum net width of 24 inches.
(9) "Guardrails." Working platforms shall be furnished
						  with permanent guard rails not less than 36 inches high, and not more than 42
						  inches high at the front of building side. At the rear, and on the sides, the
						  rail shall not be less than 42 inches high. An intermediate guardrail shall be
						  provided around the entire platform between the top guardrail and the
						  toeboard.
(10) "Toeboards." A 4-inch toeboard shall be provided
						  along all sides of the working platform.
(11) "Open spaces between guardrails and toeboards."
						  The spaces between the intermediate guardrail and platform toeboard on the
						  building side of the working platform, and between the top guardrail and the
						  toeboard on other sides of the platform, shall be filled with metallic mesh or
						  similar material that will reject a ball 1 inch in diameter. The installed mesh
						  shall be capable of withstanding a load of 100 pounds applied horizontally over
						  any area of 144 square inches. If the space between the platform and the
						  building face does not exceed 8 inches, and the platform is restrained by
						  guides, the mesh may be omitted on the front side.
(12) "Flooring." The platform flooring shall be of the
						  nonskid type, and if of open construction, shall reject a 9/16 - inch diameter
						  ball, or be provided with a screen below the floor to reject a 9/16 - inch
						  diameter ball.
(13) "Access gates." Where access gates are provided,
						  access gates shall be self-closing and self-locking.
(14) "Operating device for vertical movement of the
						  working platform."
(i) The normal operating device for the working
						  platform shall be located on the working platform and shall be of the
						  continuous pressure weatherproof electric type.
(ii) The operating device shall be operable only when
						  all electrical protective devices and interlocks on the working platform are in
						  position for normal service, and the roof car, if provided, is at an
						  established operating point.
(15) "Emergency electric operative device."
(i) In addition, on roof-powered platforms, an
						  emergency electric operating device shall be provided near the hoisting machine
						  for use in the event of failure of the normal operating device for the working
						  platform, or failure of the traveling cable system. The emergency operating
						  device shall be mounted in a locked compartment and shall have a legend mounted
						  thereon reading: "for Emergency Operation Only. Establish Communication With
						  Personnel on Working Platform Before Use."
(ii) A key for unlocking the compartment housing the
						  emergency operating device shall be mounted in a break-glass receptacle located
						  near the emergency operating device.
(16) "Manual cranking for emergency operation."
						  Emergency operation of the main drive machine may be provided to allow manual
						  cranking. This provision for manual operation shall be designed so that not
						  more than 2 persons will be required to perform this operation. The access to
						  this provision shall include a means to automatically make the machine
						  inoperative electrically while under the emergency manual operation. The design
						  shall be such that the emergency brake is operative at or below governor
						  tripping speed during manual operation.
(17) "Arrangement and guarding of hoisting
						  equipment."
(i) Hoisting equipment shall consist of a power-driven
						  drum or drum contained in the roof car, also known as roof-powered platforms,
						  or contained on the working platform, also known as self-powered
						  platform.
(ii) The hoisting equipment shall be power-operated in
						  both up and down directions.
(iii) Guard or other protective devices shall be
						  installed wherever rotating shafts or other mechanisms or gears may expose
						  personnel to a hazard.
(iv) Friction devices or clutches shall not be used for
						  connecting the main driving mechanism to the drum or drums. Belt or
						  chain-driven machines are prohibited.
(18) "Hoisting motors."
(i) Hoisting motors shall be electric and of
						  weather-proof construction.
(ii) Hoisting motors shall be in conformance with
						  applicable provisions of paragraph (c)(22) of this appendix, Electrical Wiring
						  and Equipment.
(iii) Hoisting motors shall be directly connected to
						  the hoisting machinery. Motor couplings, if used, shall be of steel
						  construction.
(19) "Brakes." The hoisting machine or machines shall
						  have 2 independent braking means, each designed to stop and hold the working
						  platform with 125 percent of rated load.
(20) "Hoisting ropes and rope connections."
(i) Working platforms shall be suspended by wire ropes
						  of either 6 X 19 or 6 X 37 classification, preformed or non-preformed.
(ii) [Reserved]
(iii) The minimum factor of safety is 10, and shall be
						  calculated by the following formula:
F = S x N / W
Where:
S
Manufacturer's rated breaking strength of 1
										rope.
N
Number of ropes under load.
W
Maximum static load on all ropes with the
										platform and its rated load at any point of its travel.
(iv) Hoisting ropes shall be sized to conform with the
						  required factor of safety, but in no case shall the size be less than 5/16 inch
						  diameter.
(v) Winding drums shall have at least 3 turns of rope
						  remaining when the platform has landed at the lowest possible point of its
						  travel.
(vi) The lengthening or repairing of wire rope by the
						  joining of 2 or more lengths is prohibited.
(vii) The non-drum ends of the hoisting ropes shall be
						  provided with individual shackle rods which will permit individual adjustment
						  of rope lengths, if required.
(viii) More than 2 reverse bends in each rope is
						  prohibited.
(21) "Rope tag data."
(i) A metal data tag shall be securely attached to 1 of
						  the wire rope fastenings. This data tag shall bear the following wire rope
						  data:
(a) The diameter in inches.
(b) Construction classification.
(c) Whether non-preformed or preformed.
(d) The grade of material used.
(e) The manufacturer's rated breaking strength.
(f) Name of the manufacturer of the rope.
(g) The month and year the ropes were installed.
(22) "Electrical wiring and equipment."
(i) All electrical equipment and wiring shall conform
						  to the requirements of General Industry Safety Standard Part 39 "Design Safety
						  Standards for Electrical Systems," except as modified by ANSI A120.1 "Safety
						  Requirement for Powered Platforms for Exterior Building Maintenance," 1970
						  edition, as adopted in R 408.40509. For detail design specifications for
						  electrical equipment, see Part 2 of ANSI A120.1, 1970 edition.
(ii) All motors and operation and control equipment
						  shall be supplied from a single power source.
(iii) The power supply for the powered platform shall
						  be an independent circuit supplied through a fused disconnect switch.
(iv) Electrical conductor parts of the power supply
						  system shall be protected against accidental contact.
(v) Electrical grounding shall be provided.
(a) Provision for electrical grounding shall be
						  included with the power-supply system.
(b) Controller cabinets, motor frames, hoisting
						  machines, the working platform, roof car and roof car track system, and
						  noncurrent carrying parts of electrical equipment, where provided, shall be
						  grounded.
(c) The controller, where used, shall be so designed
						  and installed that a single ground or short circuit will not prevent both the
						  normal and final stopping device from stopping the working platform.
(d) Means shall be provided on the roof car and working
						  platform for grounding portable electric tools.
(e) The working platform shall be grounded through a
						  grounding connection in a traveling cable. Electrically powered tools utilized
						  on the working platform shall be grounded.
(vi) Electrical receptacles located on the roof or
						  other exterior location shall be of a weatherproof type and shall be located so
						  as not to be subject to contact with water or accumulated snow. The receptacles
						  shall be grounded and the electric cable shall include a grounding conductor.
						  The receptacle and plug shall be a type designed to avoid hazard to persons
						  inserting or withdrawing the plug. Provision shall be made to prevent
						  application of cable strain directly to the plug and receptacle.
(vii) Electric runway conductor systems shall be of the
						  type designed for use in exterior locations and shall be located so as not to
						  be subject to contact with water or accumulated snow. The conductors,
						  collectors, and disconnecting means shall conform to the same requirements as
						  those for cranes and hoists in General Industry Safety Standard Part 39 "Design
						  Safety Standards for Electrical Systems," as referenced in R 408.40509. A
						  grounded conductor shall parallel the power conductors and be so connected that
						  it cannot be opened by the disconnecting means. The system shall be designed to
						  avoid hazard to persons in the area.
(viii) Electrical protective devices and interlocks of
						  the weatherproof type shall be provided.
(ix) Where the installation includes a roof car,
						  electric contact or contacts shall be provided and so connected that the
						  operating devices for the working platform shall be operative only when the
						  roof car is located and mechanically retained at an established operating
						  point.
(x) Where the powered platform includes a
						  power-operated roof car, the operating device for the roof car shall be
						  inoperative when the roof car is mechanically retained at an established
						  operating point.
(xi) An electric contact shall be provided and so
						  connected that it will cause the down direction relay for vertical travel to
						  open if the tension in the traveling cable exceeds safe limits.
(xii) An automatic overload device shall be provided to
						  cut off the electrical power to the circuit in all hoisting motors for travel
						  in the up direction, should the load applied to the hoisting ropes at either
						  end of the working platform exceed 125 percent of its normal tension with rated
						  load, as shown on the manufacturer's data plate on the working platform.
(xiii) An automatic device shall be provided for each
						  hoisting rope which will cut off the electrical power to the hoisting motor or
						  motors in the down direction and apply the brakes if any hoisting rope becomes
						  slack.
(xiv) Upper and lower directional limit devices shall
						  be provided to prevent the travel of the working platform beyond the normal
						  upper and lower limits of travel.
(xv) Operation of a directional limit device shall
						  prevent further motion in the appropriate direction, if the normal limit of
						  travel has been reached.
(xvi) Directional limit devices, if driven from the
						  hoisting machine by chains, tapes, or cables, shall incorporate a device to
						  disconnect the electric power from the hoisting machine and apply both the
						  primary and secondary brakes in the event of failure of the driving
						  means.
(xvii) Final terminal stopping devices of the working
						  platform:
(a) Final terminal stopping devices for the working
						  platform shall be provided as a secondary means of preventing the working
						  platform from over-traveling at the terminals.
(b) The device shall be set to function as close to
						  each terminal landing as practical, but in such a way that under normal
						  operating conditions it will not function when the working platform is stopped
						  by the normal terminal stopping device.
(c) Operation of the final terminal stopping device
						  shall open the potential relay for vertical travel, thereby disconnecting the
						  electric power from the hoisting machine, and applying both the primary and
						  secondary brakes.
(d) The final terminal stopping device for the upper
						  limit of travel shall be mounted so that it is operated directly by the motion
						  of the working platform itself.
(xviii) Emergency stop switches shall be provided in or
						  adjacent to each operating device.
(xix) Emergency stop switches shall comply with the
						  following:
(a) Have red operating buttons or handles.
(b) Be conspicuously and permanently marked
						  "Stop."
(c) Be the manually opened and manually closed
						  type.
(d) Be positively opened with the opening not solely
						  dependent on springs.
(xx) The manual operation of an emergency stop switch
						  associated with an operating device for the working platform shall open the
						  potential relay for vertical travel, thereby disconnecting the electric power
						  from the hoisting machine and applying both the primary and secondary
						  brakes.
(xxi) The manual operation of the emergency stop switch
						  associated with the operating device for a power-driven roof car shall cause
						  the electrical power to the traverse machine to be interrupted, and the
						  traverse machine brake to apply.
(23) "Requirements for emergency
						  communications."
(i) Communication equipment shall be provided for each
						  powered platform for use in an emergency.
(ii) Two-way communication shall be established between
						  personnel on the roof and personnel on the stalled working platform before any
						  emergency operation of the working platform is undertaken by personnel on the
						  roof.
(iii) The equipment shall permit 2-way voice
						  communication between the working platform and include the following:
(a) Designated personnel continuously available while
						  the powered platform is in use; and
(b) Designated personnel on roof-powered platforms,
						  undertaking emergency operation of the working platform by means of the
						  emergency operating device located near the hoisting machine.
(iv) The emergency communication equipment shall be
						  either of the following types:
(a) Telephone connected to the central telephone
						  exchange system.
(b) Telephones on a limited system or an approved 2-way
						  radio system, provided designated personnel are available to receive a message
						  during the time the powered platform is in use.
(D) "TYPE T POWERED PLATFORMS"
(1) "Roof car." The requirements of paragraphs (c)(1)
						  to (5) of this appendix apply to Type T powered platforms.
(2) "Working platform." The requirements of paragraphs
						  (c)(6) to (16) of this appendix apply to Type T powered platforms.
(i) The working platform shall be suspended by at least
						  2 wire ropes.
(ii) The maximum rated speed at which the working
						  platform of self-powered platforms may be moved in a vertical direction shall
						  not exceed 35 feet per minute.
(3) "Hoisting equipment." The requirements of
						  paragraphs (c)(17) and (18) of this appendix shall apply to Type T powered
						  platforms.
(4) "Brakes." Brakes requirements of paragraph (c)(19)
						  of this appendix apply.
(5) "Hoisting ropes and rope connections."
(i) Paragraph (c)(20)(i) to (vi) and (viii) of this
						  appendix apply to type T powered platforms.
(ii) Adjustable shackle rods in subparagraph
						  (c)(20)(vii) of this appendix shall apply to Type T powered platforms if the
						  working platform is suspended by more than 2 wire ropes.
(6) "Electrical wiring and equipment."
(i) The requirements of paragraph (c)(22)(i) to (vi) of
						  this appendix apply to Type T powered platforms. "Circuit protection
						  limitation," "powered platform electrical service system," all operating
						  services and control equipment shall comply with the specifications contained
						  in Part 2, section 26, of ANSI A120.1 "Safety Requirement for Powered Platforms
						  for Exterior Building Maintenance," 1970 edition, as adopted in R
						  408.40509.
(ii) For electrical protective devices the requirements
						  of paragraph (c)(22)(i) to (viii) of this appendix apply to Type T powered
						  platforms. Requirements for the "circuit potential limitation" shall be in
						  accordance with the specifications contained in Part 2, section 26, of ANSI
						  A120.1 "Safety Requirement for Powered Platforms for Exterior Building
						  Maintenance," 1970 edition, as adopted in R 408.40509.
(7) "Emergency communications." All the requirements of
						  paragraph (c)(23) of this appendix apply to Type T powered
						  platforms.