I agree Radar. I didn't know it until I came to Nevada, but there actually exist rubber "hoses" manufactured to serve specifically as "conduit" in mines. As mines are not subject to the NEC, these hoses have "MSHA" approval, rather than a UL tag.
Re: SO in Hose#121612 08/03/0503:11 AM08/03/0503:11 AM
Hey.. think of it as Extra Extra Hard Service cable..
I've had events where we used every section of Yellow Jacket (cable ramps) that we had, and placed barricades to protect the rest of the cable run.. what did the drivers do? They stopped, and started to move the barricades so they could drive over the unprotected cable (actually multi-pair audio snake) before I stopped them, and read them the riot act. Sometimes you just can't win..