MS Underground Utilities Practice Questions - Mississippi Underground Utilities Contractor Examination Exam

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Before employees enter an excavation more than 4 feet deep where a hazardous atmosphere could reasonably be expected, OSHA requires the atmosphere to be tested. Flammable gas must not exceed:

5 percent of the lower flammable limit 10 percent of the lower flammable limit 20 percent of the lower flammable limit 50 percent of the lower flammable limit

Correct Answer:

20 percent of the lower flammable limit

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