Cooperative Personnel Services Firefighter (CPS) Practice Exam 2026 - Free Firefighter Exam Questions and Study Guide

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What does Class I Group D indicate regarding flammable concentrations?

They are present only in normal conditions

They are present in locations with high combustion risk

They occur only under abnormal situations

Class I Group D indicates that flammable concentrations are present only under abnormal situations. This classification refers to environments where flammable gases, vapors, or liquids may exist, but typically not during standard operational conditions. Instead, these conditions arise when there is an accidental release or failure in system safeguards.

In essence, fluctuations in the environment or equipment can lead to the presence of these flammable substances, but they are not continuously monitored in a way that would suggest they are a regular risk. The nature of Class I Group D suggests that safety measures must still be implemented to monitor such risks, as they could lead to hazardous situations if not appropriately managed during those abnormal conditions.

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They are never present in construction sites

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