When should a Class C fire extinguisher be used instead of a Class A?

A.
When electrical equipment is on fire

B.
When fuel is on fire

C.
When fire or wood is on fire

D.
When metal such as Magnesium is on fire

Explanation:
A class C is an electrical fire, thus an extinguisher with the
proper suppression agent should be used. The following shows the fire types, their
attributes, and suppression methods.
Fire Class
A Common combustible
B Liquid Fire
C Electrical Fire
D Metals such as Magnesium