CWEA Collection System Maintenance (CSM) Certification Grade 2 Practice Test 2025 - Free CSM Grade 2 Practice Questions and Study Guide

The classification of fires is based on the types of materials that are burning, and each class corresponds to a specific category of combustible materials.

Class D fires specifically involve combustible metals, which include metals like magnesium, titanium, potassium, sodium, and aluminum. These types of fires pose unique challenges because they may not be extinguished with water or standard fire suppression agents, as many metals can react violently when exposed to water or even certain types of fire extinguishing agents. Special firefighting agents such as dry powder extinguishers specifically designed for metal fires are required to effectively manage and extinguish them.

Understanding the classification system is crucial for safety and effective fire response. In contrast, other classes, such as A, B, and C, pertain to different types of materials: Class A for ordinary combustibles (like wood and paper), Class B for flammable liquids (like gasoline and oil), and Class C for electrical fires. Each of these requires different strategies and tools for effective firefighting.