... cableTo be laid indoors, in tunnel, cable furrow or pipe, the cable couldn't bear mechanical force outside YJYYJLYXLPE insulation PE sheath power ... , steel tape armor, PVC sheath power cable To be laid underground, the cable could bear certain mechanical force, but it couldn't bear ... power cableBe applicable to the well, water inside and fall in the bad soil, the cable cans bear the equal dint outside ...