How to calculate the size of the conductor for particular
Answers were Sorted based on User's Feedback
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
|Is This Answer Correct ?||43 Yes||10 No|
Answer / sam khanji
the size of conductor is depending at the following
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
|Is This Answer Correct ?||35 Yes||5 No|
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.
|Is This Answer Correct ?||1 Yes||0 No|
Answer / marios
According to the 16th edition Wiring Regulations(British
standards) regulation 433-02-01 states that:
"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
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
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.
|Is This Answer Correct ?||6 Yes||6 No|
Answer / venkatkamalahsan
conductor is directly proportional to its load current and indirectly proportional to it s length
|Is This Answer Correct ?||1 Yes||1 No|
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
|Is This Answer Correct ?||0 Yes||0 No|
Answer / kushal
size of conductor directly proportional to its current
carrying capacity and temperature ..
|Is This Answer Correct ?||4 Yes||8 No|
Answer / shrikant
As per the thumb rule you can taek 3amps in aluminum
conductor and around 6 amps in copper wire
|Is This Answer Correct ?||1 Yes||29 No|
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