UTP Cable Power Distance Chart

When power is transmitted over long distances, voltage may drop. To reduce the amount of voltage drop, pairs of wires can be combined. The chart below shows the voltage over different distances using 1, 2 and 3 pairs of wires. The chart assumes use of a 24AWG CAT5 cable.

 

12V DC Chart

  50m 100m 300m
  1 pair 2 pairs 3 pairs 1 pair 2 pairs 3 pairs 1 pair 2 pairs 3 pairs
50mA 11.4 11.7 11.8 10.8 11.3 11.6 9.6 10.6 11.0
100mA 11.0 11.5 11.5 9.7 10.8 11.2   9.2 10.1
150mA 10.5 11.2 11.3 9.0 10.4 10.9     9.3
200mA   11.0 11.2   9.9 10.6      
250mA   10.7 11.0   9.4 10.2      
300mA   10.5 10.8     9.9      
350mA   10.3 10.6     9.7      
400mA   10.0 10.4     9.4      
450mA   9.6 10.2            
500mA   9.2 9.8            

24V AC Chart

  50m 100m 300m 600m
  1 pair 2 pairs 3 pairs 1 pair 2 pairs 3 pairs 1 pair 2 pairs 3 pairs 1 pair 2 pairs 3 pairs
50mA             21.0 22.4 23.0 18.1 21.2 22.1
100mA             18.7 21.1 22.2 12.9 18.7 20.4
150mA             16.2 20.0 21.3   16.1 18.9
200mA             13.7 18.1 20.5   13.5 17.1
250mA             10.9 17.4 19.6   11.1 15.4
300mA               16.1 18.8     13.8
350mA               15.0 18.1     12.2
400mA               13.9 17.3     10.7
450mA               12.7 16.6      
500mA               11.3 15.4