Question

(id:100001)
after the trench has been exposed for the installation of direct buried cables, the layer that should be added next into the trench is?
a. 3 to 4\ of tamped soft bedding of sand or stone - free earth
b. 6 to 8\ of tamped sand or stone - free earth
c. compacted backfill
d. optional protective cover
clear my choice

Explanation:

For direct - buried cable installation, after the trench is exposed, the next step is to add a soft bedding layer. The standard practice is to put 3 to 4 inches of tamped soft bedding (like sand or stone - free earth) in the trench first. Option b has an incorrect thickness (6 - 8 inches is not the initial bedding thickness), option c (compacted backfill) is done after the cable and protective layers, and option d (optional protective cover) is not the immediate next layer after the trench is exposed. So the correct option is a.

Answer:

a. 3 to 4" of tamped soft bedding of sand or stone - free earth