ASME A120.1-2008 pdf – Safety Requirements for Powered Platforms and Traveling Ladders and Gantries for Building Maintenance.
(b) When full load is applied to the circuit, building conductors shall be of such capacity that not more than a 3% voltage drop from nominal equipment requirements shall occur at each building outlet.
(c) Communications and power connections shall be weatherproof and provided with locking type connectors. They shall be protected from damage and abrasion.
(d) Each communication and power outlet shall be provided with an adjacent strain relief anchor to prevent force from being applied to the outlet or to the conduit leading to the outlet by movement of the equipment.
(e) The equipment power supply shall be from an independent electrical circuit that shall remain separate from all other equipment within or on the building, except hand tools used in conjunction with the equipment. TI the building is provided with an emergency power system, the equipment circuit may be designed so it may be connected to the emergency circuit.
(‘fi The power circuit shall be provided with a cutoff switch that can be locked in the “OFF” position. To allow the equipment operators access to the switch, it shall be conveniently located relative to the primary operating area of the equipment.
(g) Power and communication outlets shall be located at the approximate elevation of the primary equipment operating area. The outlets should be located so that no more than 100 ft (30.38 m) of supply cable need be used for the horizontal area being traversed.
(Ii) The power circuit shall contain a separate equipment electrical grounding conductor.
(I) Carriage track systems shall be electrically connected to an earth ground.
(7) Communication Facilities. A two—way voice communication system shall be provided between the equipment operators and a manned station while the working platform is in use. The communication facility shall be operable and manned at all times when the equipment is being used.
2.3.7 Miscellaneous Requirements
(a) Cable Stabilization, Other Than for Suspension Wire Ropes. For equipment installations where the vertical travel of a manned platform exceeds approximately 200 ft (61 rn), a means shall be provided to stabilize separate hanging lifelines, and all cables not in tension, to restrict their displacement by wind or any other force. Stabilization means shall be provided for each 200 ft (61 m) of vertical travel of the platforms. The means of stabilization may be independent of the building face being serviced.
For equipment installations where constant tension is maintained in the suspended cables, and the vertical travel of a suspended manned platform exceeds approximately 600 ft (183 rn), means shall be provided to stabilize the cables at intervals of approximately 600 ft (183 m) or less.
(b) Emergency Recovery Requirements. Procedures shall be provided for the safe emergency recovery of persons working from suspended equipment, or other types of installations, in the event of power failure, equipment failure, or disability of any nature. Emergency procedures shall be included in the operating and maintenance instructions for the installation.
(c) Building Requirements. All repairs or major maintenance required on those portions of the building that provide primary support for the equipment shall be performed under the direction of a registered professional engineer. Upon completion of repairs or maintenance, the engineer shall provide the building owner with certification that the repair or maintenance has been properly accomplished and that the building has been restored to meet the requirements of this Standard.
3.1 GeneraL
The design, construction, and installation of equipment under this Standard shall be governed by the requirements imposed for its use and by the environmental factors to which the equipment will be exposed.