BSI PD IEC/TR 63054:2017

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Low-voltage switchgear and controlgear. Fire risk analysis and risk reduction measures

Published By	Publication Date	Number of Pages
BSI	2017	24

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Categories: 29.130.20 - Low voltage switchgear and controlgear, BSI

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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 61641;
risks due to smoke emissions;
double faults, i.e. multiple phenomenon, potentially combined.

PDF Catalog

PDF Pages	PDF Title
2	National foreword
4	CONTENTS
5	FOREWORD
7	INTRODUCTION
8	1 Scope 2 Normative references
9	3 Terms and definitions
10	4 Ignition modes for electrical fires 4.1 General
11	Tables Table 1 – Ignition phenomena in electrotechnical products
12	4.2 Overheating at the connection point due to loose connections 4.2.1 General Table 2 – Root causes of electrical fires according to [6] Table 3 – Potential failure modes for low-voltage switchgear and controlgear
13	4.2.2 Ignition mechanisms 4.2.3 Loose connections mitigation measures Figures Figure 1 – Voltage drop and power dissipation versus current values (schematic) [5]
15	Table 4 – Function of the equipment and glow-wire test temperatures
16	4.3 Overheating of internal power conductors 4.4 Arcs 4.4.1 General
17	4.4.2 Breaking and making arcs 4.4.3 Arcs occurring at loose connections Figure 2 – Current and voltage conditions for switching arcs (schematic) [10]
18	4.4.4 Arcing through char and tracking arcs 4.4.5 Sparks 4.4.6 Arcs due to excessive overvoltage 4.5 Failure of electronic components 4.5.1 Basic description of the ignition mechanism
19	4.5.2 Mitigation measures 5 Conclusion
20	Table 5 – Relevant source ignition modes for low-voltageswitchgear and controlgear
21	Bibliography