How do you select instrumentation cables for different applications?

Cable selection factors: signal type (thermocouple extension, RTD, 4-20 mA, digital), environment (temperature, chemicals, UV, mechanical stress), shielding requirements (individual pair, overall, foil or braid), conductor size (voltage drop for long runs), and standards compliance (ISA, NEC, hazardous area). Specific cables: thermocouple extension (matched to TC type), RTD (low resistance, matched conductors), analog (shielded twisted pair), and digital (impedance matched, category rated). Installation: proper termination, shield grounding, separation from power, and appropriate cable tray/conduit. Documentation: cable schedule with routing and specifications.