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1.4 ATMOSPHERIC TESTING
Before an employee enters an electrical enclosed space, the atmosphere in the space shall be tested with a direct-reading meter or similar instrument,
capable of collection and immediate analysis of
samples without need for off-site evaluation.
Con Edison employees may only use the MSA Altair 5X Multigas Detector or Drager X-am 7000.
Initial monitoring shall be documented, including time and results.
Structures required to be de-watered must be tested for a safe atmosphere prior to operating pumps or
similar equipment and prior to entry/re-entry.
Continuous atmospheric monitoring is required at all times while entrants are in the enclosed space. The monitor inlet must be positioned at a height of
approximately 4 feet above the working surface to correspond with the breathing zone.
Atmospheric testing is required prior to space entry for the following reasons:
• To evaluate the hazards and to verify that
acceptable conditions for entry exist.
• To ensure that acceptable conditions are
maintained during the entry work.
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