# VOLTAGE DROP CALCULATOR by shitingting

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```									Voltage drop calculator
Power Supply           12     12        Volts                      Voltage at last camera               10.93
Cable type             18 AWG (Good Fig 8)                         Minimum allowable voltage             10.8
Cable distance               100        Meters                     Maximum cable run                      113         Meters
allowing for voltage drop
Total Camera Current         500        mA

Maximum voltage drop          10         %

Notes
Calculation is based upon a simple resistance formula only

Final voltage = Original voltage - (resistance of cable * current in cable)

There are a few ways of calculating approximate voltage drop - this is the most basic
but accurate enough for the current consumption and voltages we're using

Typical allowable voltage drop for a camera is 10%, i.e. if it needs 12V to run, it will USUALLY run well on 10.8V
It's a good 'rule of thumb' but may not be the case for every camera….some may refuse to run at anything below 12V!
run well on 10.8V
n at anything below 12V!
CABLE TYPES                     approx           Ohms per xx meters
mm2              1000 feet            1 meter
Good 2 core Fig 8 (24/020)           0.82   1       6.5                    0.02
Thin 2 core Fig 8 (14/020)           0.52   2      10.4                    0.03
Cat 5 2 pair                         0.33   3         13.1                 0.04
Cat 5 3 pair                         0.49   4 8.733333                     0.03
Cat 5 4 pair                         0.65   5         6.55                 0.02
10 AWG                               5.27   6      1.02                    0.00
12 AWG                               3.31   7      1.62                    0.01
14 AWG                               2.08   8      2.58                    0.01
16 AWG                               1.31   9      4.09                    0.01
18 AWG (Good Fig 8)                  0.82   10      6.5                    0.02
20 AWG (Thin Fig 8) (0.52mm2)        0.52   11     10.4                    0.03
22 AWG                               0.33   12     16.5                    0.05
24 AWG (CAT 5 single pair)           0.16   13     26.2                    0.09
26 AWG (0.13mm2)                     0.13   14     41.6                    0.14
28 AWG (0.08mm2)                     0.08   15      66                     0.22
100 meters   Voltages
2.13           12
3.41         13.8
4.30           24
2.87           28
2.15          220
0.33          240
0.53
0.85
1.34
2.13
3.41
5.41
8.60
13.65
21.65

```
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