Answer / ashraf majid

The size(cross sectional area) of the conductor for a
particular load not only depends upon the current drawn by
the load(nature of the load), it also depends upon nature
(resistivity) of the conductor material(i,e; whether the
conductor material is made of copper, silver or any other
material). It also depends upon the external physical and
environmental conditions.

Answer / sam khanji

the size of conductor is depending at the following
1- load
2- distance
3- type of conducter
4- if the conductor is outdoor or indoor

usually the size of conductors could be calculated based on
voltage drop and based on the mentioned above

Answer / sri

depend upon the load curret

Answer / basavaraj

Selection of a cable is

1) Depend on load
2) Find out De-rating factors(its depend on the where we have to laid (Duct,Air,Earth)
3) Length of cable(If cable length is more we have to increase the sectional area .If shorter the length reduce the size of the cable.

Answer / marios

According to the 16th edition Wiring Regulations(British
standards) regulation 433-02-01 states that:
In>=Ib
In<=Iz
I2<=1.45Iz

Note:
"Iz" is the current capacity of a cable
"In" is the nominal current (current of the load)
"I2" is the current causing effective operation of the
protective device

So to calculate the size you do the following.
First you must find the In. Then you go to Appendix 4 and
you can find the size for the conductor by checking Iz to be
grater or equal to In.

e.g. Calculating Iz for a single core PVC insulated cables,
Wiring method enclosed in conduit, System of supply 240Vrms
50Hz single phase TNC-S
SOLUTION
In=20A, Iz must be > or = to In.Go to table 4D1A. When
Iz=20A Cross Sectional Area = 2.5mm^2 (Iz=In is what we
want). So the size of a conductor for 20A must be 2.5mm^2.

If you take into consideration the Temperature (T) then you
must follow the following equation: Iz>=In/(Ca*Cg*Ci) where
Ca,Cg,Ci are constants and you must find them at Appendix 4
always according to the Temperature given and also the type
of calbe been used.

Answer / venkatkamalahsan

conductor is directly proportional to its load current and indirectly proportional to it s length

Answer / ankur trigunayat

According to me size of conductor is depend on many factor---
1-Type of load
2-Load in amp.(fan and light circuit or power circuit,like as ac Refrigeratior,microwave Owen etc.)
3-Meachinical strength of wire

Answer / kushal

size of conductor directly proportional to its current
carrying capacity and temperature ..

Answer / shrikant

As per the thumb rule you can taek 3amps in aluminum
conductor and around 6 amps in copper wire

in case of OC+EF relay, how the burden is divided/calculated/shared by the CTs in case of normal (healthy condition) and during fault conditions.? three coils of OC & ef coil is conected in residual connection across the three CTS.

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