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[MOVED] Low voltage control panel

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Aminullah

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Dear Friends,

How to calculate the cable size for 1250A ATS panel. The distance between the panel to Genset is 5m and the voltage drop is 5%. line to line voltage is 380v and power factor is 0.85. Thank you.
 

You permit 5% voltage drop of 380V, over a distance of 5m.

You need a table giving specs for wire gauges. See the figures for ohms per 1000 feet, or ohms per kilometer.

Your genset puts out an expected Ampere level. This figure, times your wire resistance (5m length), shall equal your permitted voltage drop. Do calculations for various wire gauges. Choose the gauge that does not drop more than your desired spec.

Since power factor is less than 1, you need to reduce demand on your genset in the same proportion. You may or may not need to increase wire diameter accordingly.
 

Hi,

wire diameter depends on amperage RMS .. it doesn´t care about power factor.

You just need to involve power factor if you want to calculate the current from power (and volts..)


***
But if it´s 1250A RMS and you calculate with 5% loss of 380V = 19V ... then this gives a dissipated power of almost 24kW ... over 5m ... this is a lot of heat.


Klaus
 

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