Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
What type of fire extinguisher is used for steady equipment?
Inert gas
Mulsifyre method
Foam method
Any of above
Any of above
Quick Summary: In electrical installations, fire fighting requires agents that are electrically non-conductive and leave no harmful residues. Inert gases, foam, and specific water-based 'mulsifyre' systems (which atomize water into a fine mist) are all standard choices depending on the voltage level and equipment type.
In electrical installations, fire fighting requires agents that are electrically non-conductive and leave no harmful residues. Inert gases, foam, and specific water-based 'mulsifyre' systems (which atomize water into a fine mist) are all standard choices depending on the voltage level and equipment type.
P=VI — Power relationship in electrical equipment
ρd>10°12Ω⋅m — Typical dielectric requirement for extinguishing agents
The principle involves either oxygen displacement (inert gas), cooling (mulsifyre/water mist), or smothering (foam). For electrical equipment, the agent must possess high dielectric strength to prevent short-circuits or tracking during discharge.
Electrical fires are classified as Class C or Class E depending on the standard.
Water should never be used as a solid stream on live equipment due to conductivity risk.
Inert gases like CO2 or Argonite are preferred for high-value sensitive equipment as they leave no residue.
Mulsifyre systems use fine water droplets that have high electrical resistance compared to a continuous water jet.
Inert gases prevent corrosion of sensitive electronic components.
Mulsifyre systems offer excellent cooling and fire suppression for large transformers.
Foam can be conductive and difficult to clean from delicate circuitry.
Inert gas requires enclosed spaces to be effective.
Substations
Control rooms
Transformer vaults
Switchgear cabinets
The 'Mulsifyre' method specifically utilizes high-velocity water discharge through atomizers to create a non-conductive spray.
Always disconnect power before using any extinguisher if possible, except for certified electrical-safe agents.
D is correct — All listed methods, including Inert gas, Mulsifyre, and Foam, are valid suppression techniques for steady electrical equipment when applied appropriately.
In competitive exams, remember that CO2 is the most commonly cited extinguisher for electrical panels because it leaves zero residue, unlike powder or foam.