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Class IB — Test atmosphere before entry and continuously monitor atmosphere <br />during entire time of occupancy of space. <br />1 <br />• CLASS 1B <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />r <br />B. Class II — Dangerous but not immediately life threatening <br />Confined spaces where an atmosphere free of dangerous air contamination, oxygen <br />deficiency or oxygen enrichment has been verified. <br />1. At least one person shall stand by outside of the space prepared to give assistance in <br />case of emergency. <br />2. Visual, voice or signal line communications shall be maintained between the <br />individuals in the space and the stand -by person. <br />3. An approved safety belt or harness with an attached line shall be used where practical <br />and feasible. The line shall be at least 2000 -pound test and secured outside the entry <br />opening. <br />19 <br />