NEMA PRP 1-2014 (R2019) presents conduit-in-casing construction as a technically sound solution to the problem of laying power/communication cables under a surface obstruction (highway, runway, rail bed, river, etc.) without disrupting traffic roadbed, rail bed or riverbed.
More Standards PDF
NECA 409-2015
$20.00 $40.00
NECA 407-2015
$20.00 $40.00
JIS R 1701-2:2016
$37.00 $75.00
NEMA EWS 1.5-2016
$41.00 $83.00