Employes shall not enter manholes until they have assured themselves that the manholes are free from dangerous gases, by testing with approved safety lamps, by ventilation, or by other adequate methods. Reference should be made to § 39.542 (relating to testing for gas).
34 Pa. Code § 39.433
This section cited in 34 Pa. Code § 39.431 (relating to general provisions); 34 Pa. Code § 39.441 (relating to general provisions); 34 Pa. Code § 39.461 (relating to general requirements); 34 Pa. Code § 39.471 (relating to general requirements); and 34 Pa. Code § 39.491 (relating to general requirements).