Cables buried directly with cables laid inside pipe conduits-30mm
When the compression test stipulated by JIS
C 3653 was conducted, the deformation ratio was less than 3.5% in all
cases. When a 25-ton truck drove over a location where pipe as been buried at a depth of 30 cm from the ground surface, the deformation ratio
was less than 3.5%, demonstrating sufficient resistance against loads
