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.
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NEMA EW 6-2006
$63.00 $127.00
JIS R 6242:2006
$42.00 $84.00
NACE SP0387-2006
$89.00 $179.00
JIS H 3510:2006
$24.00 $49.00