Answer / ajay lathwal

Generally motors are of two type 1) single phase 2) three
phase
1) in this type 3 core cable used 1 for phase 2nd for
neutral 3rd for ground
while in,
2) in this type 3 core cable used for three phases & ground
is attached separatlly
Thats why 3 core cable used.

Answer / suburavichandran

only 3 phase motors are connected with such 3c cables. it is because the 4th core is used for neutral return particularly during unbalanced condition.It rises when each phase is connected to different single phase loads.since 3phase motors are balanced loads.there s no need for the 4th core i mean neutral.

Answer / chr

why there is no neutral in motors???

Answer / anant.katwa

4c is supplied bcz the 4th core use as spare core if one of
the core get open it may use.

Anant.

Answer / neeraj pandey

Generally the Motors(approx 80% AC Motors) are 3 Phase
operated and having three terminals for taking supply. so
they required only three core cable.
Thats why there is no need of extra core in cable.

when an induction motor runs on load.at that time if we reduce the supply voltage the current increases.But when it runs without load,if we reduce the supply voltage the current also reduced.why?.i checked it practically also.

1 Answers   Birla,

how much speed will trawiling current

3 Answers   TCS,

1.What is the proper definition of power system stability? 2.some times a blue spark is visible in the secondary side of a distribution transformer at the contact position of bushings and fuse wire,why?

1 Answers  

In hydel power plants, L.A's, S.C's are placed inside the control panel boards. what is the purpose? [already the total body was earthed to ground.]

0 Answers  

what is the per unit cost of generation of electricity at thermal,hydro,desael,solar,gas power plant

1 Answers  

What would be the ratio of a Delta-Wye tranformer having 48000 volts phase to phase on the primary and 4160 volts phase to phase on the secondary?

5 Answers  

where would be tap changer in transformer & why?

2 Answers   Kentz,

why the transmission side of the generating transformer is always star??

5 Answers  

_____hamari_____tumhari____ne dil ki_____utari. _____ne ____ dekha ashe ___ doshti ko lage na hamari.Complete pajal

1 Answers   Microfine Industries,

why root three is used and how its comes in three phase power system?

1 Answers   IEEE,

What happens when ac supply is given as excitation voltage instead of dc supply

1 Answers  

How induction stove works?

1 Answers