ISO/TC 178/WG 8 - Electrical requirements

This document specifies the immunity performance criteria and test levels for apparatus used in lifts, escalators and moving walks which are intended to be permanently installed in buildings including the basic safety requirements in regard to their electromagnetic environment. These levels represent essential EMC requirements. This document refers to EM conditions as existing in residential, office and industrial buildings. This document addresses commonly known EMC related hazards and hazardous situations relevant to lifts, escalators and moving walks when they are used as intended and under the conditions foreseen by the lift installer or escalator and/or moving walk manufacturer. It is assumed that no ports connected to safety circuit only are rated at currents greater than 100 amps. It is assumed that mobile telephones and radio transmitters used at frequencies and power of that stated in Table 1 are not placed within 200 mm distance from safety circuit(s). However: — performance criteria and test levels for apparatus/assembly of apparatus used in general function circuits do not cover situations with an extremely low probability of occurrence; — this document does not apply to other apparatus already proven to be in conformity to the EMC national regulation, and not related to the safety of the lift, escalator or moving walk, such as lighting apparatus, communication apparatus, etc. This document does not apply to electromagnetic environments such as: — radio transmitter stations; — railways and metros; — heavy industrial plant; — electricity power stations; which need additional investigations. This document is not applicable to apparatus which were manufactured before the date of its publication.

This document specifies the emission limits in relation to electromagnetic disturbances and test conditions for lifts, escalators and moving walks, which are intended to be permanently installed in buildings. It is possible, however, that these limits do not provide full protection against disturbances caused to radio and TV reception when such equipment is used within distances given in Table 1. This document is not applicable for apparatus which are manufactured before the date of its publication

1.1 This document is applicable to the product family of escalators and moving walks used in residential buildings, offices, hospitals, hotels, industrial plants, etc. This document covers those aspects that need to be addressed when programmable electronic systems are used to carry out electric safety functions for escalators and moving walks (PESSRAE). This document is applicable for escalator and moving walk safety functions that are identified in escalator and moving walk codes, standards, or laws that reference this document for PESSRAE application. The safety integrity levels (SILs) specified in this document are understood to be valid for PESSRAE application in the context of the referenced escalator and moving walk codes, standards, and laws in the Bibliography. 1.2 This document is also applicable for the application of PESSRAE that are new or deviate from those described in this document. 1.3 The requirements of this document regarding electrical safety/protective devices are such that it is not necessary to take into consideration the possibility of a failure of an electric safety/protective device complying with all the requirements of this document and other relevant standards. This document: a) uses safety integrity levels (SIL) for specifying the target failure rate for the safety functions to be implemented by the PESSRAE; b) specifies the requirements for achieving safety integrity for a function but does not specify who is responsible for implementing and maintaining the requirements (for example, designers, suppliers, owner/operating company, contractor); this responsibility is assigned to different parties according to safety planning and national regulations; c) applies to PE systems used in escalator and moving walk applications that meet the minimum requirements of a recognized escalator and moving walk standards, such as EN 115, ASME A17.1/CSA B44 or The Japan Building Standard Law Enforcement Order For Elevator and Escalator; d) defines the relationship between this document and IEC 61508 and defines the relationship between this document and ISO 22200; e) outlines the relationship between escalator and moving walk safety functions and their safe-state conditions; f) applies to phases and activities that are specific to design of hardware and software but not the phases and activities which occur post design, for example sourcing and manufacturing; h) provides requirements relating to the hardware and software safety validation; i) establishes the safety integrity levels for specific escalator and moving walk safety functions; j) specifies techniques/measures required for achieving the specified safety integrity levels; k) defines a maximum level of performance (SIL 3) which can be achieved for a PESSRAE according to this document and defines a minimum level of performance (SIL 1). 1.4 This document does not cover: a) hazards arising from the PE systems equipment itself such as electric shock etc.; b) the concept of fail-safe that can be of value when the failure modes are well defined and the level of complexity is relatively low. The concept of fail-safe was considered inappropriate because of the full range of complexity of PESSRAE that are within the scope of this document; c) other relevant requirements necessary for the complete application of a PESSRAE in an escalator and moving walk safety function, such as system integration specifications, temperature and humidity, the mechanical construction, mounting and labelling of switches, actuators, or sensors that contain PESSRAE. d) foreseeable misuse involving security threats related to malevolent or unauthorized action. This document can be used in cases where a security threat analysis needs to be considered, provided that the specified SIL has been reassessed.

ISO 22201-1:2017 is applicable to the product family of passenger and goods/passenger lifts used in residential buildings, offices, hospitals, hotels, industrial plants, etc. This document covers those aspects that it is necessary to address when programmable electronic systems are used to carry out electric safety functions for lifts (PESSRAL). This document is applicable for lift safety functions that are identified in lift codes, standards or laws that reference this document for PESSRAL. The SILs specified in this document are understood to be valid for PESSRAL in the context of the referenced lift codes, standards and laws in Annex B. NOTE Within this document, the UK term "lift" is used throughout instead of the US term "elevator". ISO 22201-1:2017 is also applicable for PESSRAL that are new or deviate from those described in this document. The requirements of this document regarding electrical safety/protective devices are such that it is not necessary to take into consideration the possibility of a failure of an electric safety/protective device complying with all the requirements of this document and other relevant standards. In particular, this document a) uses safety integrity levels (SIL) for specifying the target failure measure for the safety functions implemented by the PESSRAL; b) specifies the requirements for achieving safety integrity for a function but does not specify who is responsible for implementing and maintaining the requirements (for example, designers, suppliers, owner/operating company, contractor); this responsibility is assigned to different parties according to safety planning and national regulations; c) applies to PE systems used in lift applications that meet the minimum requirements of a recognized lift standard such as EN 81, ASME A17.1-2007/CSA B44-07, or lift laws such as the Japan Building Standard Law Enforcement Order For Elevator and Escalator; d) defines the relationship between this document and IEC 61508 and defines the relationship between this document and the EMC standard for lifts on immunity, ISO 22200; e) outlines the relationship between lift safety functions and their safe-state conditions; f) applies to phases and activities that are specific to design of software and related hardware but not to those phases and activities that occur post-design, for example sourcing and manufacturing; g) requires the manufacturer of the PESSRAL to provide instructions that specify what is necessary to maintain the integrity of the PESSRAL (instruction manual) for the organization carrying out the assembly, connections, adjustment and maintenance of the lift; h) provides requirements relating to the software and hardware safety validation; i) establishes the safety integrity levels for specific lift safety functions; j) specifies techniques/measures required for achieving the specified safety integrity levels; k) provides risk-reduction decision tables for the application of PESSRALs; l) defines a maximum level of performance (SIL 3) that can be achieved for a PESSRAL according to this document and defines a minimum level of performance (SIL 1). ISO 22201-1:2017 does not cover: - hazards arising from the PE systems equipment itself, such as electric shock, etc.; - the concept of fail-safe, which can be of value when the failure modes are well defined and the level of complexity is relatively low; the concept of fail-safe is considered inappropriate because of the full range of complexity of the PESSRAL that are within the scope of this document; - other relevant requirements necessary for the complete application of a PESSRAL in a lift safety function, such as the mechanical construction, mounting and labelling of switches, actuators, or sensors that contain the PESSRAL. It is necessary that these requirements be carried out in accordance with the national lift standard that references this document. - foreseeable misuse involving security threats related to malevolen

ISO/TR 22201-3:2016 provides additional information and process for the development of the instruction manual required by ISO 22201‑1 (PESSRAL) and ISO 22201‑2 (PESSRAE) for programmable electronic systems for use by competent maintenance person(s) that carry out maintenance operations.

ISO/TR 16764:2003 consists of a comparison of electromagnetic interference/electromagnetic compatibility (EMI/EMC) worldwide standards of interest to the lift industry.

ISO 22199:2010 specifies the emission limits and test conditions for lifts, escalators and passenger conveyors permanently installed in buildings. For conducted phenomena and harmonic distortion, ISO 22199:2010 is applicable to equipment intended to be connected to low-voltage systems interfacing with the public supply at the low-voltage level. It is not applicable to equipment intended to be connected only to private low-voltage systems interfacing with the public supply only at the medium- or high-voltage level.