Electrical TNS Earthing System

Need?

Sorry not a electrical guy?

TNS = Terra Neutral Separate

Not many non electrical people would know that little gem. Methinks you know the answer Mr. Anonymous.

Staying Anonymous doesn't mean I know the answer, replying doesn't mean you know the answer.

Thank you for your time.

Can you spell "redundancy"?

Thank you.

Ring circuit(earth or sockets)ensures reliablity even if one of the two wires on the ring breaks.

Thank you

Good question. Please sign up to the forum, and you will likely get a good answer.

(we need more people like you who are honest about what they don't know, and are willing to meet us half way.)

And no, in answer, I have no freakin' idea why the ring...grin!

Thank you

IEC 60364 distinguishes three families of earthing arrangements, using the two-letter codes TN, TT, and IT.

The first letter indicates the connection between the power-supply equipment (generator or transformer) and the earth.

• "T" - Direct connection of a point (wye point) with earth (Latin: terra)
• "I" - No point is connected with earth (isolation), except perhaps via a high impedance.

The second letter indicates the connection between casing / housing / the earth point of the electrical device being supplied and the earth.

• "T" - Direct connection of a point with earth
• "N" - Direct connection to neutral at the origin of installation, which is connected to the earth
• "U" - Metallic casing are connected with each other, but not intentionally with the earth.
• "M" - Metallic casing are connected with each other and connected with the supply wye point, but not intentionally with the earth.

In case of a third or a fourth letter; this indicates the design of the neutral line and/or the protection line (earth connection line)

• "S" - the neutral and the earth connection line are separated wires (S = separation)
• "C" - the same wire is used for neutral and earth connection line (C = combined)

I agree with you, rudy.leurs: IEC 60364-1 is referring to TNS as one earthing type system- with a separated PE grounding conductor. But, it seems to me, the OP was referred to "earth chamber". Maybe one of these:

An "earth chamber" is employed to connect a grounding-vertical-rod with a horizontal grounding cable and for testing the grounding rod. Why we need 2 of these? In a substation or in a power station could be a hundred, depends of how many grounding rods one needs. The modern grounding system is using cadweld-or other welding technology-and it doesn't need "earth chambers".

The foundation grounding- and earth ring-see:

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

The "earth chamber" image did not appear. I'll try one more time.

I guess you are in the U.K. We don't use a ring system in OZ, so I am saying you don't NEED a ring system unless it is mandated by legislation.

Jim