Answer :
If the conduit length from the finished surface (dirt area) to the box is 18 inches or less, no extra support is necessary for this installation.
What is Trenchless Installation of Conduits Underneath Highway?
Trenchless Installation of Conduits Underneath Highways is described as a planned and engineered way with the issue of permits for installing conduits beneath roadways, local transportation authorities; and manufacturers of trenchless construction equipment.
It presents the current situation of the technique for laying conduits beneath highways without open-cut excavation using trenchless technology.
If the conduit length from the finished surface (dirt area) to the box is 18 inches or less, no extra support is necessary for this installation.
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