ASME A17.5:2019 pdf download

ASME A17.5:2019 pdf download.Elevator and escalator electrical equipment
1 Scope
1.1 The requirements of this Standard apply to the following electrical equipment for elevators, escalators, moving walks, dumbwaiters, material lifts, and elevating devices for persons with physical disabilities (platform lifts and stairway chairlifts): a) motor controllers; b) motion controllers; c) operation controllers; d) operating devices; and e) all other electrical equipment not listed/certified and labelled/marked according to another product safety standard or code. The equipment specified in this Standard is intended for installation in accordance with the Canadian Electrical Code, Part I (CSA C22.1) and the National Electrical Code (ANSI/NFPA 70), whichever is applicable. Note: Controllers (i.e., motion, motor, and operation controllers) are defined in CSA B44 and ASME A17.1. 1.2 The electrical equipment covered by this Standard is intended a) to be connected to supply circuits at a nominal system voltage of 600 V or less; b) for internal voltages that are not more than 1500 V; c) for use in non-hazardous locations in accordance with the rules of the applicable electrical codes; and d) for use in an ambient temperature no greater than 40 °C. Note: This Standard does not include requirements for equipment intended for use in an ambient temperature above 40 °C. Additional investigation of the equipment will be required when equipment is to be used in ambient temperature above 40 °C. 1.3 The object of this Standard is to reduce the risk of injury to persons and damage to property from fire and electrical shock by presenting requirements for the proper design, the good construction, and the high quality of work of the equipment listed in Clause 1.1. 1.4 This Standard does not apply to devices that are rated for connection to extra-low-voltage Class 2 supply circuits as defined in the applicable electrical code. Note: Extra-low-voltage circuits are circuits that have a voltage of not more than 30 V rms or 42.4 V peak.
2 Reference publications, definitions, and abbreviations
bonding — a low impedance path obtained by permanently joining all non-current-carrying metal parts to ensure electrical continuity and having the capacity to conduct safely any current likely to be imposed on it. clearance distance — the shortest distance in air between two conductive parts. comparative tracking index (CTI) — a rating which provides an indication of the material’s ability to withstand carbonization due to low level electrical current on the surface of the material. conformal coating — a protective covering applied on a printed circuit board capable of conforming to the configuration of objects coated, used to increase the dielectric voltage-withstand capability between conductors and/or to protect against environmental conditions. control circuit — a circuit that carries the electric signals directing the performance of a controller, but which does not carry the main power circuit. controller — a device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected. controller, motor, manual — a motor controller operated only by direct manual means. controller, motor, solid-state — a motor controller designed to make and/or break the current in a motor circuit by means of the controlled conductivity of a semiconductor. creepage distance — the shortest distance along the surface of a solid insulating material between two conductive parts.enclosure — the outer cabinet that completely encloses live parts of an electrical apparatus to prevent personnel from accidentally contacting energized parts and to protect the equipment from physical damage. enclosure, fire — a part of the equipment intended to minimize the spread of fire or flames from within. enclosure environmental rating — an enclosure rating signifying compliance with defined environmental construction and performance requirements. live parts — conductive components intended to be energized during operation. motor circuit — the circuit that carries the main power for a motor. motor control circuit — the control circuit associated with a motor controller. opposite polarity — with respect to spacing and insulation requirements of this standard, a difference in potential between two points, such that shorting of these two points would result in a condition involving an over current; rupturing of printed wiring-board traces, components, or fuses; or similar results. overcurrent — any current in excess of the rated current of equipment or the ampacity of a conductor resulting from abnormal conditions. It may result from overload, short circuit, or ground fault. overcurrent device — a device capable of automatically opening an electric circuit, under both predetermined overload and short-circuit conditions, either by fusing of metal or by electromechanical means.