Permit-Required Confined Spaces.
Testing includes specifying the tests that are to be performed in the permit space.
If electronic or thermal equipment is used to perform such tests, and the possibility exists of an explosive substance or a hazardous atmosphere due to flammable gases and vapors, then the testing equipment must be approved for use in such explosive or flammable conditions as required by section 2540.2. Section 142.3, Labor Code. Other Confined Space Operations. Section 142.3, Labor Code. No source of ignition shall be permitted in any location, indoors or outdoors, where the concentration of the flammable gases or vapors exceeds or may reasonably be expected to exceed 25 percent of the lower explosive limit.