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For Class C fires, which involve electrical equipment, it is crucial to use an extinguisher that does not conduct electricity. When dealing with electrical fires, using a conductive agent could lead to severe consequences, including electrical shock or further spreading the fire. Therefore, extinguishers specifically designed for Class C fires typically use non-conductive agents such as carbon dioxide or dry chemical powders. These agents effectively extinguish the fire while ensuring the safety of the person using the extinguisher.

In contrast, the other options are not appropriate for dealing with Class C fires. The size of the extinguisher, while important for the fire's magnitude, does not address the critical safety aspect of electricity. Additionally, water is a conductive substance and can exacerbate electrical fires by creating dangerous situations. Lastly, while portability is a beneficial feature for ease of movement during emergencies, it is secondary to the necessity of using a non-conductive agent.