Re: Need some help for the cables.

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BoByS
Based on the formula, I think that 4mm^2 will be good enought, but I still need a help..

RAMPS has 5 and 11amp fuses for the main electronics and heated bed respectively. 11 amps chassis wiring is a 20 AWG cable or approximately .5mm^2 for you metric loving builders. That's the bare minimum and doesn't give you any safety margin. Anything 1.5-4mm^2 will be fine with the larger the better up to what will fit in the connector.

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BoByS
1) 1.5 mm^2 - for the LNG cables;
2) ??? - for the yellow and black cables;
3) ??? - for the heated bed's D08 purple cables.

1. Pretty much any old extension cord will work. An old computer cable is fine with the connector cut off. 360 watts / 220 volts = 1.46 amps. Even if your power supply has awful efficiency converting AC to DC, you're still only drawing a couple of amps.
2. The yellow and black cables between the power supply and the RAMPS are mentioned above. They carry 12v but higher amps, up to 11amps (or possibly more if your heated bed is out of usual spec. The 1.5-4mm^2 mentioned above applies here.
3. The same applies from #2.

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P.S. Sorry about my lame questions, but these 30Amps really confuse me. The RAMPS board have only 11 and 5 Amps sockets...

The sockets normally only have 11 and 5 amps. They can have higher demands for short periods of time. Also many power supplies are a little overly optimistic in their rating and they can't produce that full current 100% of the time. Or in the case of many computer power supplies, the power supply is incapable of delivering the full power on the +12v rail. Instead, the total wattage is the optimistic sum of all the rails, or a combination of rails. The good news is that oversizing the power supply doesn't hurt anything and the printer will only draw what it needs. You may however pay extra for additional capacity you really don't need, or your supply won't operate at it's peek eficiency.