Subelement Q: SAFETY— Topic 100: Safety Steps
Question 3-100Q4
Element 3 (GROL)What class of fire is one that is caused by an electrical short circuit and what is the preferred substance used to extinguish that type of fire?
Explanation
An electrical short circuit causes a **Class C fire**. These fires involve energized electrical equipment, and it is critical to use an extinguishing agent that does not conduct electricity. The preferred substances for extinguishing Class C fires are **carbon dioxide (CO2)** or **dry chemical** (such as ABC or BC types) extinguishers.
Using water on an electrical fire is extremely dangerous because water conducts electricity, creating a severe risk of electrocution for anyone attempting to extinguish the fire. Fire classifications A, B, and D refer to ordinary combustibles, flammable liquids/gases, and combustible metals, respectively. Therefore, those options are incorrect as they do not describe fires originating from energized electrical sources, which are common in amateur radio setups. Maintaining proper fire safety protocols is essential for all radio operators.
Related Questions
3-100Q2 What is the purpose of not putting sharp corners on the ground leads within a building?3-100Q3 Should you use a power drill without eye protection?3-100Q5 Do shorted-stub lightning protectors work at all frequencies?3-100Q6 What is a GFI electrical socket used for?3-10B1 What is the peak-to-peak RF voltage on the 50 ohm output of a 100 watt transmitter?