trial hole definition
trial hole means an excavation for exposing part of the target cable, carried out under the supervision of a competent person at the point of works where the working personnel use hand tools for digging with the exception that hand-held power tools can be used to break the paved surface up to a depth of 150mm in a footpath or 600mm in a carriageway and, in both cases, with at least 250mm clearance from any cable alignment.
trial hole means an excavation for exposing part of the target underground telecommunications lines, carried out under the supervision of a competent person at the site of work by site personnel using hand tools for digging, with the exception that hand-held power tools can be used to break the concrete paved surface with extreme care;
trial hole means a test hole of limited cross section in relation to its depth, typically drilled using either mechanical or hydraulic augers.