420.1 Scope
This part of GB/T 16895 applies to electrical installations with regard to measures for the protection of persons, livestock and property against
——thermal effects, combustion or degradation of materials, and risk of burns caused by electrical equipment,
——flames in case of a fire hazard being propagated from electrical installations to other fire compartments segregated by barriers which are in the vicinity, and the impairment of the safe functioning of electrical equipment including safety services.
Note: Protection against overcurrent is dealt with in IEC 60364-4-43.
420.2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 16895.18-2010 Electrical installations of buildings—Part 5-51: Selection and erection of electrical equipment—Common rules (IEC 60364-5-51: 2005, IDT)
GB/T 16895.21-2011 Low-voltage electrical installations—Part 4-41: Protection for safety—Protection against electric shock (IEC 60364-4-41:2005, IDT)
IEC 60332 (all parts) Tests on electric and optical fibre cables under fire conditions
IEC 60598-2-24 Luminaires Part 2-24: Particular requirements—Luminaires with limited surface temperatures
IEC 61084 (all parts) Cable trunking and ducting systems for electrical installations
IEC 61386 (all parts) Conduit systems for cable management
IEC 61534 (all parts) Powertrack systems
IEC 61537 Cable management—Cable tray systems and cable ladder systems
420.3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
420.3.1
combustible
capable of burning
420.3.2
fire
——a process of combustion characterized by the emission of heat and effluent accompanied by smoke, and/or flame and/or glowing
——rapid combustion spreading uncontrolled in time and space
420.3.3
flammability
ability of a material or product to burn with a flame under specified test conditions
420.3.4
ignitability
measure of the ease with which a specimen can be ignited due to the influence of an external source, under specified test conditions
420.3.5
ignition
initiation of combustion
Note: For more information see IEC 60695-4.
420.3.6
non-flam propagating component
component which is liable to ignite, as a result of an applied flame, but in which the flame does not propagate and which extinguishes itself within a limited time after the flame is removed
[IEC 60050-442:1998, 442-01-12]
Foreword i
420.1 Scope
420.2 Normative references
420.3 Terms and definitions
421 Protection against fire caused by electrical equipment
422 Precautions where particular risks of fire exist
422.1 General
422.2 Conditions of evacuation in an emergency
422.3 Locations with risks of fire due to the nature of processed or stored materials
422.4 Locations with combustible constructional materials
422.5 Fire propagating structures
422.6 Selection and erection of installations in locations with endangering of irreplaceable goods
423 Protection against burns
424 Protection against overheating
424.1 Forced air heating systems
424.2 Appliances producing hot water or steam
424.3 Space heating appliances
Bibliography
