Determining Wire Gauge Requirements

When installing electronic access control systems, it is necessary to determine the correct gauge of wire to prevent voltage drop off over long wire runs. The charts below show approximate distance/wire gauge recommendations based on voltage/amperage requirements. You need to determine the total amperage required by the equipment you are using before determining wire size. The vertical column on the left of the charts indicates the amperage. Follow the line which matches your amperage requirement to the maximum distance your wire will run and then go up to the recommended wire size.

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12V AC/DC - 12V AC/DC - 12V AC/DC - 12V AC/DC - 12V AC/DC - 12V AC/DC 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
  AMPS  ||  20AWG  |  18AWG  |  16AWG  |  14AWG  |  12AWG  |  10AWG
======================================================================
  .250  ||   300'  |   450'  |   750'  |  1200'  |  2000'  |  3000'
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  .500  ||   150'  |   225'  |   375'  |   600'  |  1000'  |  1500'
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  .750  ||   100'  |   150'  |   250'  |   375'  |   600'  |  1000' 
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  1.00  ||    75'  |   100'  |   200'  |   300'  |   500'  |   800'
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  1.25  ||    60'  |    90'  |   150'  |   240'  |   380'  |   600'
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  1.50  ||    50'  |    80'  |   125'  |   200'  |   300'  |   500'
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  1.75  ||    40'  |    70'  |   100'  |   170'  |   275'  |   460'
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  2.00  ||    35'  |    60'  |    90'  |   150'  |   240'  |   400'
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  2.25  ||     -   |    50'  |    80'  |   130'  |   200'  |   350'
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  2.50  ||     -   |     -   |    75'  |   120'  |   190'  |   300'
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  2.75  ||     -   |     -   |    70'  |   100'  |   170'  |   280'
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  3.00  ||     -   |     -   |    60'  |   100'  |   160'  |   260'
======================================================================

====================================================================== 24V AC/DC - 24V AC/DC - 24V AC/DC - 24V AC/DC - 24V AC/DC - 24V AC/DC - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - AMPS || 20AWG | 18AWG | 16AWG | 14AWG | 12AWG | 10AWG ====================================================================== .250 || 600' | 900' | 1500' | 2400' | 4000' | 6000' ---------------------------------------------------------------------- .500 || 300' | 450' | 750' | 1200' | 2000' | 3000' ---------------------------------------------------------------------- .750 || 200' | 300' | 500' | 750' | 1200' | 2000' ---------------------------------------------------------------------- 1.00 || 150' | 200' | 400' | 600' | 1000' | 1600' ---------------------------------------------------------------------- 1.25 || 120' | 180' | 300' | 480' | 760' | 1200' ---------------------------------------------------------------------- 1.50 || 100' | 160' | 250' | 400' | 600' | 1000' ---------------------------------------------------------------------- 1.75 || 80' | 140' | 200' | 340' | 550' | 920' ---------------------------------------------------------------------- 2.00 || 70' | 120' | 180' | 300' | 480' | 800' ---------------------------------------------------------------------- 2.25 || - | 100' | 160' | 260' | 400' | 700' ---------------------------------------------------------------------- 2.50 || - | - | 150' | 240' | 380' | 600' ---------------------------------------------------------------------- 2.75 || - | - | 140' | 200' | 340' | 560' ---------------------------------------------------------------------- 3.00 || - | - | 120' | 200' | 320' | 520' ======================================================================

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