IEC TR 63054:2017 pdf download

IEC TR 63054:2017 pdf download.Low-voltage switchgear and controlgear – Fire risk analysis and risk reduction measures
1 Scope
This document applies to the fire risk analysis of low-voltage switchgear and controlgear (hereinafter referred to as “equipment”) referring to the IEC 60947 relevant publications, where the following applies: – only the case where a fire originates (typically under fault or misuse conditions) within the equipment; – only equipment installed in normal environments. Hazardous environments, for example in presence of combustible materials, is not to be considered; – only the case of products selected, installed and used according to the manufacturer instructions and installation rules. In addition, the following cases are not considered: – faults addressed by IEC TR 61 641 ; – risks due to smoke emissions; – double faults, i.e. multiple phenomenon, potentially combined.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC Guide 1 1 6:201 0, Guidelines for safety related risk assessment and risk reduction for low voltage equipment IEC 60695-1 -1 0:201 5, Fire hazard testing – Guidance for assessing the fire hazard of electrotechnical products – General guidelines IEC 60947-1 :2007, Low-voltage switchgear and controlgear – Part 1: General rules IEC 60947-1 :2007/AMD1 :201 0 IEC 60947-1 :2007/AMD2:201 4 IEC 60947-2, Low-voltage switchgear and controlgear – Part 2: Circuit-breakers IEC 60947-3, Low-voltage switchgear and controlgear – Part 3: Switches, disconnectors, switch-disconnectors and fuse-combination units IEC 60947-5-1 , Low-voltage switchgear and controlgear – Part 5-1: Control circuit devices and switching elements – Electromechanical control circuit devices IEC 60947-6-1 , Low-voltage switchgear and controlgear – Part 6-1: Multiple function equipment – Transfer switching equipment
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 fire risk probability of a fire combined with a quantified measure of its consequence [SOURCE: IEC 60695-1 -1 0:201 6, 3.5, modified – Note 1 to entry deleted.] 3.2 electrical fire fire caused by electrical equipment or installation 3.3 spark electric spark small luminous electric arc of short duration [SOURCE: IEC 60050-1 21 :1 998, 1 21 -1 3-1 6] 3.4 electric arc high-temperature luminous electric discharge across a gap or through a medium such as charred insulation [SOURCE: NFPA 921 :201 4] 3.5 discharge electric discharge discontinuous movement of charge carriers through part of an otherwise insulating medium, initiated by electronic avalanche and supplemented by secondary processes [SOURCE: IEC 60050-1 21 :1 998, 1 21 -1 3-1 1 ]3.6 tracking progressive formation of conductive paths, which are produced on the surface or within a solid insulating material, due to the combined effects of electric stress and electrolytic contamination [SOURCE: IEC 60050-21 2:201 0, 21 2-1 1 -56, modified – Note deleted.]
4 Ignition modes for electrical fires
4.1 General Physical effects occurring in electrical equipment that can potentially cause fires are listed in Table 1 below, inspired by Table 1 of IEC 60695-1 -1 0:201 6.