Answer / uttam dutta

cURRENT CARRYING CAPACITY NOT ONLY DEPENDS ON THE CROSS
SECTION OF THE COPPER WIRE, IT ALSO GREATLY DEPENDS UPON
THE TYPE AND THICKNESS OF THE INSULATION, ONE MORE FACTOR
IS CORE OF THE CABLE, IE SINGLE CORE OR MULTICORE.
cONSIDERING ALL THIS FATORS STRICTLY IT CAN BE SAID 1 SQ.
MM COPPER CABLE CAN BEAR MAX.11 AMP SAFELY CONTENIOULY AND
2.R CAN BEAR 19 AMP . 4 SQ MM CAN BEAR 26 AMP. SOME TIME
THIS MAY VARY LITTLE DEPENDING UPON MAKE.

Answer / sonam

CURRENT DENSITY OF CU IS 1 AND AL IS 0.7.FROM HEREU CAN
FIND CURRENT CARRYINGCAPACITY IF U HAVE AREA

Answer / amro

depend the weathier out side the cabel
1- temperature
2- length of the cable
3-load factor
4- the cabel throw ( in air &duct & pipe &cabel tranch&
cabel leader inside the tranch)

for exampel:-
i= power/ volt* cos@
after that let used cabel 4 mm2
look in the catlog cabel and taking the rated current
oppset the wire

rated current *load factor*factor group*factor throw (in
air &duct & pipe &cabel tranch& cabel leader inside the
tranch )*factor temprature =current
1- if more then the load current ites ok
2- if less then the load current ites no must be chose the
big size cabel and again
calculate the equation and so an
after the calculate the voltge droop presentage must be
less the _+ 5 % from the main voltge

Answer / raju

in case copper wire we usually take 4(approximately) amps
per square mm

Answer / ramesh kumar k

No.. No.. Mr. Raju... it is 2A/sq.mm atmost for safe
operation... other wise copper wire will burn out...

so the thumb rule is the current carrying capacity is
double that of area...

why there is a fault occurs, if a phase wire touches ground.. and the fault not occurs when we connect a bulb between phase and ground..??

1 Answers  

---

how much distance is required for earth pit to earth pit in substation???

3 Answers   Divis Laboratories,

---

For a CT the number of turns in the primary winding is.........

5 Answers  

---

What is the starting current of a DC Motor?

2 Answers  

---

how capacitor buield up the voltage

3 Answers  

---

---

Explain role of Buckolz Relay in Transformer ?

7 Answers  

---

How Diesel Generator start ?

0 Answers   ITC Infotech, Voltech,

---

how to find the 2500 KVA transformer rated primary and secondary volt and current?

4 Answers  

---

how to calculate regulation constants for over head lines? and what are the regulation constant for raccoon conductor at different voltage level and different P.F?

0 Answers  

---

When Alarm report at LED,Alarm volatge is 11-13 Volt But LED is of 3 volt.then why not it burn?

0 Answers  

---

How to select the different contactors ( starter combination) for different AC motors? what about fuse cappacity 4 different motors too?

2 Answers   Equate,

---

In case of HV test on medium voltage cables, BS is asking for 4 U0 where as IEC is asking for 3.5 U0. Can any one advise me how this 3.5 times or 4 times U0 is derived?

0 Answers  

---