working in excavations & trenches Flashcards
Excavations less than ? deep do not require a protection system if a competent person has determined there is no cave-in potential.
5’
An adequate means of exit must be provided for entering or leaving excavations when the depth is at least ?
4’
By definition, trenches are narrow excavations made below the surface of the ground. Generally the depth of a trench is greater than the width, but the width of a trench is not greater than ?
15’
The OSHA standards for trenching and excavations are found in 1910.269 and ?
osha 1926-650 subpart p
A trench atmosphere test with an oxygen level of ? or less, is indication of an oxygen deficiency.
19.5%
OSHA studies have confirmed that excavation and trenching work is one of the most dangerous types of construction work. The fatality rate for excavation work is nearly ? that of other construction work.
twice
One of the most important factors in reducing worker fatalities and injuries related to excavations is ?
proper planning prior to the start of the job.
Whenever excavating within ? of energized lines, digging should be done by hand or with a sucker (vacuum) truck.
5’
Never look at the cut end of a fiber optic cable.
true
The sides of an excavation ? or more in depth must be shored, sloped, or otherwise supported per OSHA standards.
5’
It is a rare occurrence for a stone from between a tire and the pavement to be “shot”.
false
Atmosphere testing is required in trenches ? or more in depth or where oxygen deficient conditions could be reasonably be expected to exist.
4’
