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Question:

A fire extinguisher that is rated B:C is suitable for

A electrical fires and burning liquids.
Explaination

A B:C fire extinguisher is non-conductive and suitable for a class B fire (which includes practically all volatile liquids) (hence its C rating). It should not, however, be used on burning items that can be sprayed with water, such as wood, paper, or linen. An A or A:B:C fire extinguisher is required.