TNCS or TNS

[Jimmyb]

I just wondered if anyone had seen a supply where there is only a single cable coming in to the service head that it was a TNCS anyway when i removed the fuse which was a sticker sealing it and was already broken I had access to all the service head connection, I noticed a live going to fuse, about 8 small black wires into neutral and the armour connected as earth. , I decided to check the loop and L-N was 0.25 and L-E was 0.39 and thought i need to check this more offen just in case

How would you normally know this wasnt TNCS and was a TNS which check between L-N & L-E

Thanks

Jimmy

 

[IQ Electrical]

I just wondered if anyone had seen a supply where there is only a single cable coming in to the service head that it was a TNCS anyway when i removed the fuse which was a sticker sealing it and was already broken I had access to all the service head connection, I noticed a live going to fuse, about 8 small black wires into neutral and the armour connected as earth. , I decided to check the loop and L-N was 0.25 and L-E was 0.39 and thought i need to check this more offen just in case

How would you normally know this wasnt TNCS and was a TNS which check between L-N & L-E

Thanks

Jimmy

It's a split concentric cable, sounds like a TN-S supply, a bit like the picture but old colours!

 

[1shortcircuit]

You could ask the DNO if you have doubts

 

[Hawk81]

That supply cable you describe is not armoured it is split concentric. Which has a large line ine the middle surrounded by small neutrals and earths.

 

[ezzzekiel]

pefc and pscc would be the same on tncs and would be a indication if not sure

 

[IQ Electrical]

pefc and pscc would be the same on tncs and would be a indication if not sure

Exactly, I think my post #2 is invisible

 

[jmtisme]

agree sounds like a split concentric

 

[RogertheBodger]

Exactly, I think my post #2 is invisible

Don't worry, we can still see you (wouldn't want you ​to be invisible)

 

[ezzzekiel]

who said that