I've worked somewhat with HF and other transmission lines, but never worked in the ULF range like you're in. You're probably going to need to use coaxial cable to transmit that unless high losses are acceptable- inductive losses with standard electrical cable are just going to kill you, even at a frequency this low. The coax shields you from EMI, too- shields everyone else from you, too. You can find tables from the manufacturers as to what the losses are for what cabling at what frequency range, and go from there.
You'll need to look at impedance-matching, too. The equipment should spec out an impedance and type of cable, and if it doesn't, the manufacturer will know.
This isn't 60Hz, so NEC won't necessarily apply.