Answer / divyesh

to give low resistance and if one earth is out of
order,second will do the required work of earthing the equipment

Answer / bilal mir

Double earthing is
used to give
minimum
resistance to the
flow of whole
current of the
apparatus in case
of short circuit or
leakage or any
such other fault.

Answer / dinakaran

for safty purpose only. if one is failure another in line

Answer / pravin

1.For safety of personnel & equipment
2.Reduces voltage fluctuation in case of excess current flow.
3.In case non use of tripping devices it reduces the risk of electrocution.

Answer / sohaib ahamad

to give low resistance and if one earth is out of
order,second will do the required work of earthing the equipment

Answer / himanshu saini

For safety purpose,if any short circuit in line or excess current flow in line and single earthing not proper working then double wire earthing pass that current and tripped the MCB of welding machine

Answer / prabakaran

Earth1 value=1ohm earth2 valu=1ohm
Parallel resistance formula =r1+r2/r1×r2 so answer=1/2 so earth value reduse so better to current flow on ground

why transmission is only 3 phase and not 2 or 4 or poly phases

0 Answers   Infosys,

what is the difference between home inverter and online ups?

2 Answers   ME,

how unidirectional torque is produced in DC motor?

0 Answers  

what is neutral?

2 Answers  

How can I calculate the trnaformer effciency at different loading condition?

2 Answers  

Ceiling fan motor wiring Hi, I have 2 ceiling fans broken. The receiver/control units burned out due to lightening. One Harbor Breeze and one Hunter's I took them apart (remove receiver units). Now on both of the motor I see 4 wires coming out from each motor I really want to know the function of each wire. Are there anyway I can test to see which is which? After searching forums I know these 4 wires are from 2 sets of coils inside the motor, one is Start winding and the other is Runing winding I could not find the receiver/control unit any where, so I am planing to buy Capacitors and universal remote controls to make the fans run again. Anyone has any idea how to do the wiring, please help Thnks

1 Answers  

why we use isolation transformer?

2 Answers   Godrej,

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2 Answers  

what is field flash

4 Answers   Bhel,

why wound rotor is star-connected?

4 Answers  

i am using auto transformer for starting of induction motor to provide reduse voltages...but the principle of a tansformer according to definition"which transform energy to on circuit to another circuit with constant power and constant frequency". so if i am using reduse voltage then current obsely hige because power is same.but we use auto transfarmer for starting of induction motor to give low current.but here according to definition we are giving hige current.

0 Answers  

what is the difference between the megger and multimeter operation ?

3 Answers