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Instrument Cable Length Between Control Room and Fire Detector
How to calculate the voltage drop of 4C X 1.5sqmm fire resistant cable connected between JB and FD?

Please let me know how to calculate the voltage drop of 4C X 1.5sqmm fire resistant cable connected between JB & FD (Digital Combined Alarm /Fault) placed 400m apart. I would be glad if some only helps me with the formula, the ref STD, and other tech details for this query.

I am using a 4C x 1.5mmsq fire resistant cable for a flame detector which is located at 400m distance from its Junction Box. Shall it work?

Your supplier specs tell you the maximum run length.