http://learncctv.com/2009/06/can-some-one-help-in-calculating-230v-cable-selection-for-feeding-power-for-cctv-cameras/ Helping you learn all about CCTV Systems Sun, 20 May 2012 23:15:33 +0000 http://wordpress.org/?v=2.7 hourly 1 http://learncctv.com/2009/06/can-some-one-help-in-calculating-230v-cable-selection-for-feeding-power-for-cctv-cameras/comment-page-1/#comment-23 Marianna Sun, 28 Jun 2009 05:49:44 +0000 http://learncctv.com/?p=26#comment-23 If you end up with 25 sqmm (!!) then you must have considered a voltage drop of almost zero. You have to be practical.... Your "camera and other systems" may be rated at 230 Volt, but you should find out at what lower voltage it still can reliably work. Sitting here, I would guess 220 Volt still will work fine. That translates to a voltage drop of 10Volt (whole length) at 5.7Amp (not 7). I suspect you have read the rating labels of your equipment and added the numbers up, all of which are peak demand. So, let's say a single length of wire in your cable should have less than 8.7Ω, which translates (at 1080 meters) into a 2 sqmm cable. So you seem to be out by a factor 10..... If you end up with 25 sqmm (!!) then you must have considered a voltage drop of almost zero. You have to be practical….
Your “camera and other systems” may be rated at 230 Volt, but you should find out at what lower voltage it still can reliably work. Sitting here, I would guess 220 Volt still will work fine.
That translates to a voltage drop of 10Volt (whole length) at 5.7Amp (not 7). I suspect you have read the rating labels of your equipment and added the numbers up, all of which are peak demand.
So, let’s say a single length of wire in your cable should have less than 8.7Ω, which translates (at 1080 meters) into a 2 sqmm cable.
So you seem to be out by a factor 10…..

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