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Ontario Security Guard Licence Exam Prep · Question

A fire involving combustible metals such as magnesium or potassium is classified as:

A 'Class D' fire involves combustible metals like magnesium, sodium, or potassium. Water should never be used on these fires as it can cause a violent reaction.

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Question: A fire involving combustible metals such as magnesium or potassium is classified as:

Answer options:

  • Class A.
  • Class B.
  • Class C. ✅ Class D.

Correct answer: Class D.

Explanation: A 'Class D' fire involves combustible metals like magnesium, sodium, or potassium. Water should never be used on these fires as it can cause a violent reaction. Specialized dry powder agents are required.

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