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Ali18
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Join Date: May 2008
Posts: 136
Good Answers: 2

earthing systems

12/20/2008 11:44 AM

Hi the forum's guys

There're three earthing systems (TN ,TT , IT) …. Please I need the characteristics of each type ,,, which electrical appliances should we apply each one for ? by other words where & when we should use each one…please enclose figures if possible.......

Also I noticed that the above systems mostly followed by "S" ,"C" or both ,,,,what do they (S,C) refer to ?

Thank U in advance

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Yuval
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Join Date: Feb 2007
Location: Israel
Posts: 2968
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#1

Re: earthing systems

12/20/2008 3:15 PM

http://en.wikipedia.org/wiki/Earthing_system

Sources:

TN is generally referred to N - Natural.

TN

.

TN - CS

.

TN - S

.

TT is generally referred to T - Terra, Grounding, Using the Earth as an infinite-value condensor or capacitor. Practically done by connecting this potential to metal-piping of water supply.

TT

TI is generally referred to I - Isolated, meaning completely isolated from grounding source.

IT

.

Types:

C is generally referred to C - Combined

S is generally referred to S - Separated

P is generally referred to P - Protective

E is generally referred to E - Earthed

N is generally referred to N - Natural
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Yuval
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Join Date: Feb 2007
Location: Israel
Posts: 2968
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#2
In reply to #1

Re: earthing systems

12/20/2008 3:30 PM

Sorry - TN - CS - and TN - S should exchange their names in the diagrams above:

.

.

.

.
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JohnBob
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Join Date: Jan 2008
Location: Bath, UK
Posts: 53
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#3
In reply to #2

Re: earthing systems

12/21/2008 9:08 AM

Nice when no one else needs to add an answer as you have covered it (and even better to catch your own mistakes before anyone else! GA)
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EnB
Associate

Join Date: Aug 2008
Location: Nigeria, West Africa (+1 GMT)
Posts: 46
#6
In reply to #2

Re: earthing systems

12/23/2008 5:56 AM

Hi,

Please am a bit confused on the difference between TN-CS and TN-S.

Thanks,

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Yuval
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Join Date: Feb 2007
Location: Israel
Posts: 2968
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#7
In reply to #6

Re: earthing systems

12/23/2008 6:15 AM

Just glance to where and how the "Earth" potential is connected to (or isolated from) the circuit
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Anonymous Poster
#4
In reply to #1

Re: earthing systems

12/22/2008 9:45 PM

N is Natural or Neutral ??

tx...
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Yuval
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Join Date: Feb 2007
Location: Israel
Posts: 2968
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#5
In reply to #4

Re: earthing systems

12/22/2008 11:16 PM

Neutral of course.

In Hebrew, Live is called "Phase", Neutral called "Zero" And Earth is called "Grounding" (in Hebrew terms), so I had to adept to the terms used in English.

As a matter of fact, I have to process everything here from Hebrew to English, back and forth, Because I think (And dream) in Hebrew...
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Ali18
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Join Date: May 2008
Posts: 136
Good Answers: 2
#8

Re: earthing systems

01/03/2009 12:01 PM

Thanks guys ……

But I ask about the proper circumstances in order to use each type , e.g. TN within "Y" type power transformer , the earhing system "…" is used within the high buildings or skyscrapers , these're just examples …. please mark out

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