Answer / bikash

SImple earth is always in zero potential, so when u connect
neutral to earth or measure voltage it will show zero
voltage. But actually neutral is the return path or it is
required for completing a ckt. It shows the unbalaced
system voltage. If system is balaced neutral will show zero
voltage or otherwise it will show voltage. So check load
condition.

Answer / m.mousa

Hi Ravi
Of course if you have your power supply neutral earthed
from supply side (transformer or generator neutral) you
will get zero potential at between the neutral and earth at
any point of the distribution circuit ; you should get more
information about the type of your earthing system (IT, TT,
TN-S or TNC)
You can find more details at Schneider site or ABB sites
or directly from IEC 60364-5-54 Electrical installations of
buildings - Selection and erection of electrical equipment -
Earthing arrangements

Answer / ravi mittal

The problem has been solved now. I have installed an isolation transformer
which has solved all the issues.

Answer / ravi mittal

Dear Bikash,

I am thankful to you for taking interest in answering my
query.

Actually, I have an equipment for which I have been clearly
indicated to not have neautal and earth shorted. If done
so, the equipment may have problems in future. When we
check with the multimeter the neautral to earth is showing
as shorted which gives a zero reading which is actually not
shorted. What can I do in this case where can I either get
a 0 reading (when not short) or <3 volts reading? Is there
a fault with my wiring? Some electricians say that this is
a usual phenomenon in industrial areas. If the phenomenon
is usual, is there a device which can be installed to
rectify this problem.

Thanks and regards,

Ravi Mittal

Answer / kannan

Cheech your earth value as per standard. If not install new
earth rod. It may solve your problem.

Answer / nadir

Possibly your machine required an IT wiring which is unearth neutral. Your machine may required only a PE and the PE electrode shall be installed at a distance of 1.5 longer than your transformer/ neutral earth electrode length.

The isolation transformer will also create harmonics and required to dissipate.

which is more dangerous AC\DC supply

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