Crowcon Xgard Bright, Инструкции по установке, эксплуатации и обслуживанию

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Installation
12
English
So consider the voltage to the detector furthest (n=1) from the controller has
to be 10V. Each cable segment has a there and back resistance of 12.1 x 2 x
20/1000 = 0.484 ohms.
So the cable volts drop to detector (n=2) is:
Vc = 0.070 x 0.484 = 0.03388V
V(n=2) = V(n=1) + Vc = 10.0338 V
Now the voltage at detector (n=3) is
V(n=3) = V(n=2) + 2Vc (as there is twice the current supplied through this
cable segment)
V(n=3) = 10.03388 + 0.06776 = 10.10164 V