Instrument cable 3×1.5 Resistance value
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As stated in the question, for an instrument cable of 3×1.5, measure the resistance of its core wires and refer to the table to find out what the typical resistance per kilometer is for multi-strand copper wires with a cross-sectional area of 1.5 mm – in Ω/km
Go ask the middle school students; they know the answer.
You can refer to “GB/T3956-2008 Conductors for Cables”. Additionally, if the manufacturer has sample cables, compare the parameters on those samples. If you want to go deeper, check out a \"Quick Reference Handbook for Power Transmission and Distribution.\"