cable calculation

Just look here and pick the size.

http://www.energy-solutions.co.uk/cable_conductor.html

You do not calculate cable sizing from the current provided to a known load. You look up the minimum cable size based on a large collection of non-linear concerns based on your location's wiring code. Some but not all of the possible concerns are:

• The maximum current that can be continuously provided by the power source. This is usually set by the circuit protection device (fuse or circuit breaker).
• Ambient temperature extremes
• Cable flexing
• Abrasion and other mechanical hazards
• Moisture
• Atmosphere (e.g. explosive, vacuum)
• Above or below ground cable route

Now if you wish to calculate the voltage drop from your source voltage to your load for a variety of different gauge wires, then I recommend that you will learn much more by doing your own homework.

Here is both a table and a calculator: http://www.powerstream.com/Wire_Size.htm

However, the local code may specify a minimum size for field wiring that is greater than the calculated value. See redfred's comments.

I=36/(230x.8)=0.19A

permissible voltage drop=((230x2)/100)+1=5.6volts

If you consider 2x1.5sq.mm pvc insulated 'AL' cable ,then it can carry maximum 10 A and voltage drop will be 1 volt per 2.3 meters

since your load is so small so you can disregard derating factor which depends on your environment condition like tem. humidity etc.

(follow the standard which is afor bunched cable ,reference standard :generally to IS:6474-71

if environment tempertaure is 30 then derating factor will be 1.12 if

temperature(air) is 55 then derating factor will be 0.83 )

Voltage drop=((cable distance x load current)/(cable distance per voltxcable A capacity)=((35mx.19A)/(2.3m per voltx10A)=0.3volts(approx.)

since its less than 5.6 volts,so you can use that cable,so when you will design your cable ,you can follow any catalogue ,then you can take decision

manufacturer to manufacturer can vary this capacity,so follow catalogue.

One uses British Standard 7671.