Cable Sizing of DC Cable

1. Calculation of cable sizewww.control.com/thread/102623677241 posts - 1 author - Last post: 3 days agoKindly can anyone send me some sample Cable and Trasformer sizing calculations. I'll appreciate that so much. Thanks and Best Regards, Sai ...
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4. electrician2.com Wire Size calculatorwww.electrician2.com/calculators/wireocpd_ver_1.htmlThis calculator applies 2011 NEC Table 310.15(B)(16) and accompanying code sections and notes to find the wire size and minimum and maximum overcurrent ...
5. Wire Size Calculatorwww.csgnetwork.com/wiresizecalc.htmlJul 13, 2011 - The purpose of the calculator is to determine the size of the conductorwire in a circuit of a given distance with a given amperage load.
6. calculate wire-conductor size

The 32A MCCB is ridiculously oversized for a 5A load. Because of the oversized CB, the wire will need to be about 8AWG (possible variation depending on local Code). With wire that large, voltage drop will be no problem at 50m.

You need the length of your cable-l,the current carrying capacity of the cable-A and the resistivity-rho, of the conductor,to calculate the cross-sectional area-a (SIZE) of the cable.If your load current is 5A,you should be looking for an mcb of 10A instead,32A is on the high side.

Find your conductor resistivity(rho) and apply the formula below.

A=rhol/a

Patrick Whowha

You can use the following application to size your cable:

http://mycableengineering.com

As others have mentioned, you should reduce the size of your MCCB. Use the application to check the sustained current capacity for how you intend to install the cable, the voltage drop and fault withstand.

As a note, if you select a fault limiting circuit breaker, the cable may not be subject to the full 35 kA.