Similar International Standards
EN 3-7:2004+A1:2007CEN (European Committee for Standardization), European Union
HighCurrent
Portable fire extinguishers - Part 7: Characteristics, performance requirements and test methods
Both specify performance and construction requirements for powder extinguishers for metal fires (Class D).
ISO 7165:2017ISO (International Organization for Standardization), International
HighCurrent
Fire fighting — Portable fire extinguishers — Performance and construction
Both define performance criteria, testing, and construction for portable Class D fire extinguishers.
NFPA 10NFPA (National Fire Protection Association), USA
MediumCurrent
Standard for Portable Fire Extinguishers
Defines requirements for selection, installation, and use of Class D extinguishers, referencing UL standards for performance testing.
AS/NZS 1841.5:2007Standards Australia / Standards New Zealand, Australia/New Zealand
HighCurrent
Portable fire extinguishers - Part 5: Specific requirements for powder type extinguishers
Both detail specifications for powder-type extinguishers, including those specifically for use on Class D fires.
Key Differences
≠IS 11833 specifies a fixed hydraulic body test pressure (3.0 MPa), whereas EN 3-7 requires compliance with the Pressure Equipment Directive (PED), where test pressure is calculated based on the maximum allowable pressure (e.g., PT ≥ 1.43 x PS).
≠The Indian standard explicitly mentions Ternary Eutectic Chloride (TEC) based powder as a suitable agent, reflecting the technology of its time. Modern standards like EN 3 and ISO 7165 are performance-based, allowing any powder that successfully passes standardized tests on specific metals.
≠IS 11833 defines specific extinguisher capacities (5, 10, 25 kg, etc.) with corresponding fire test sizes. EN 3-7 lists standard portable sizes (e.g., 6, 9, 12 kg) but does not assign a numerical rating to Class D extinguishers, only a mark of suitability for specific metals.
≠The specified body color in IS 11833 is 'Fire Red (Shade No. 536 of IS 5)', while the European equivalent EN 3 specifies 'Signal Red (RAL 3000)'. While visually similar, they are different formal color standards.
Key Similarities
≈Both IS 11833 and its international counterparts like EN 3-7 and ISO 7165 mandate a minimum effective discharge of 85% of the nominal charge of the extinguishing agent.
≈All standards are aligned in their core purpose: to specify requirements for portable extinguishers designed to combat fires involving combustible metals, designated as Class D fires.
≈Validation of effectiveness in all standards relies on performance-based fire tests on actual metals (e.g., magnesium, sodium), rather than relying solely on the chemical specification of the powder.
≈The use of welded mild steel for the extinguisher body is a common construction method specified or permitted across the Indian and major international standards.