Which of the following descriptions about electrical equipment safety is wrong?

Which of the following descriptions about electrical equipment safety is wrong?
A . The metal casing of electrical equipment must be grounded (zeroed) for protection
B . Electrical equipment should be corrosion-resistant and moisture-proof
C . When a fire occurs in electrical equipment, water can be used to extinguish the fire.
D . It is strictly forbidden to use electrical equipment beyond the rated value

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Answer: C