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ramydiab
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Join Date: Jan 2008
Posts: 24

Earthing and Neutral

08/11/2012 3:01 AM

how to measure the earth resistance on a panel board? what is the limited value?
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SAK
Commentator
Engineering Fields - Power Engineering - Projects Engineer

Join Date: Aug 2008
Location: Tanzania- East Africa
Posts: 71
#1

Re: earthing and neutral

08/11/2012 3:11 AM

i think you need to measure the EARTH LOOP IMPEDENCE.

this is best done by a good ELI tester.

this test is on live circuit and you will need to utilise a service of a qualified person.

as regards to the values.this will depend on the protection used..fuses,Mcb class etc.

generally between 0.8 to 3 ohms?

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ramydiab
Active Contributor

Join Date: Jan 2008
Posts: 24
#2
In reply to #1

Re: earthing and neutral

08/11/2012 3:16 AM

i have tried to measure it with the common mutlimeter. i have not got a fixed resistance value " that was varying" . i hava tried to measure the voltage between earth and neutral. that was a bout 1.35 v.

is that value can b considered good?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
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#3
In reply to #2

Re: earthing and neutral

08/13/2012 3:31 AM

Yet again for this forum, a voltage between earth and neutral is simply a feature of the neutral current and the earth loop impedance. It is neither good nor bad; it just is.

Consult a qualified electrician.

  • What's black and hangs from the ceiling? An electrician that doesn't know what he is doing....
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#4

Re: Earthing and Neutral

08/13/2012 3:33 AM

The qualified electrician that installed the board will measure it using test equipment and issue the occupier with a test certificate that says what it is.

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