TPN or SPN

[James sparks]

Hi all

Am looking for opinions on this one, I'll try and keep it brief.




Service cable comes in into a 3phase head (1361 100A). From the 3phase head to a Ryefield board. Single phase supplies (1361 60A) out of the Ryefield into single phase meters. SWA sub-mains from meters to flats.


Would you say the origin is TPN or SPN? The meters only offer a single phase supplies and the Ryefield etc is before the meter (so their property) but, it does enter/originate at a TPN service head.


Existing EIC has 60A 1-phase 2 wire as supply characteristics.

Is it a TPN supply/origin or becuase all of that is before the meter it's only a SPN that concerns us as the origin? There's no 3phase meter so there's no readily available TPN supply to use.



Thanks!

 

[davesparks]

Which installation are you producing the certificate for?

 

[James sparks]

A EICR for one flat

 

[Farmelectrics]

then id say its a spn

 

[ImpededLoop]

Definitely single phase.

 

[James sparks]

NICEIC tech helpline said the origin would be TPN & the primary over current protective devices the 100A 1361s.

 

[Pete999]

NICEIC tech helpline said the origin would be TPN & the primary over current protective devices the 100A 1361s.

that's an oxymoron NICEIC and tech help

 

[shanky887614]

the building will be TPN but the flat will be SPN.
the flats will be spread over different phases the same as a house on an estate.

thats why its not uncommon to have every other house to have a powercut and not the lot