Three Phase overhead supply is it TN C

[static zap]

..... in night garden with iggle piggle.

...I'l be suffering Red Wine ..piddle .. Watering them earth rods !
( DNO ..where they are ..)

 

[streamer]

The lack of RCDs is probably more to do with the age of the installation than the supply type.

 

[Darkwood]

My house has a two wire supply coming in along the outside wall, it was clearly a TT in the past but has been converted to TNC even though the supply is via 2 individual separate single cores.
The DNO risk access any existing TT before conversion I am led to believe, I see no reason why your install won't have been converted at some point even an overhead supply.

 

[Strima]

Strima are you not counting sheep in your bed .LoL .because im in night garden with iggle piggle.

A people said the Magic Roundabout was messed up...

 

[westward10]

You probably have TN-C external to the building then the PEN conductor is separated at the service head which gives the S on TN-C-S.

 

[Wilko]

Mad not to have rcbo in hotel rfc, I'd have thought.

 

[davesparks]

While carrying out a EICR I found on first inspection that there were no RCDs installed . When I checked at the Pole Mounted Transformer the Earth & Neutral were connected at the Neutral point. So am I right in concluding it's a TN-C System? The 17th Edition states that RCDs should not be installed where a TN C System is used (411.4.4)

Far more likely to be a PNB supply which is a form of TNCS.

A lack of RCDs does not dictate what the supply type is, its either a sign of the age of the installation or of non compliant work.

 

[Michael J]

Thanks to all of you for the input it is much appreciated. I got a better look today and it is as Archie and Westward10 said.

 

[Deleted account]

Do a quick Ze and pfcc and pscc. That should clarify.