Which of the following is NOT listed as a fire suppression system used in ESS installations?

• A. Dry chemical powders
• B. Foam systems
• C. Gas-based suppression
• D. Water sprinklers

Answer: (A)

In ESS installations, choosing a fire suppression method hinges on protecting flammable refrigerants and sensitive equipment while minimizing collateral damage and cleanup. Foam systems are suitable for fires involving flammable liquids because they blanket the fuel, cooling it and separating it from the air. Gas-based suppression provides rapid fire knockdown without water damage, which is especially important around electrical equipment and enclosed spaces. Water sprinklers can also be used, but their design must control heat absorption while avoiding spreading refrigerants or causing collateral damage.

Dry chemical powders aren’t typically listed for ESS installations because they leave hard-to-clean residue, can contaminate or damage electrical and refrigeration components, and are not ideal for enclosed mechanical spaces. That’s why the option not listed is the dry chemical powders.