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Initial readings will be documented including the time and results. For entry into pipe type feeder
manholes that are connected to SF6 equipment, the Chem Lab must be contacted if there has been a fault to perform monitoring (see GEHSI S17.01.01,
Electrical Enclosed Space Entry).
Where hazardous atmospheres are suspected, it is permissible to “pre-test” the space with an
instrument not approved under CEHSP S17.01
(Electrical Enclosed Spaces, section 4.4.2) for one or more concerns. This is desirable to minimize
potential damage to a space entry gas detector through overexposure. Regardless of the results and actions of any such pre-test, proper testing for all concerns using an approved instrument must be performed prior to actual space entry.
1.6 AIR SAMPLING PROCEDURES FOR
MANHOLE ATMOSPHERES
Enabling Objective: State the conditions that
require air sampling of confined spaces.
DO NOT work in any manhole or enclosure where inert gases are used until tests have been made to show sufficient air and the absence of combustibles.
Ventilate before entering a manhole having a Gas Warning sign.
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