Is this OK? 100m run of SWA

[scoul00]

What is the Ra of the TT system, or Ze if you have checked it that way?

Not that it matters too much at the moment because the new circuit is non-compliant due to the undersized cable.

Just checked the Ze of the electrode. It’s 152ohm. Will close this thread for the mean time as I realise the wrong cable was selected. Fortunately it’s at my parents house so it doesn’t have to be exactly ‘to the regs’. I’m used to an industrial setting with 3-phase so it’s a different ball game. I’ll update when I sort it out and recalculate max demand etc. Thanks all for your help

 

[westward10]

It is no different it must comply to Regulations.

 

[davesparks]

Just checked the Ze of the electrode. It’s 152ohm. Will close this thread for the mean time as I realise the wrong cable was selected. Fortunately it’s at my parents house so it doesn’t have to be exactly ‘to the regs’. I’m used to an industrial setting with 3-phase so it’s a different ball game. I’ll update when I sort it out and recalculate max demand etc. Thanks all for your help

It does have to comply with the regulations, and personally I would consider this to be even more important when it is my own family who could be put at risk from non-compliances.

Cable calculations are exactly the same ball game whether it's industrial or agricultural, the only real difference is the additional rules for agricultural as its a special location.
I assume its agricultural as its has a shepherds hut and that implies a farm.

 

[suffolkspark]

Have you got an rcd of some description upfront on the cable for fault protection as its TT?

 

[Vortigern]

Did you bury the swa, maybe you could just run a parallel cable with it???? Hmmm maybe not as well.

 

[davesparks]

Did you bury the swa, maybe you could just run a parallel cable with it????

That means digging it all up again if it's buried, so might as well go with one replacement cable as damage to the original is pretty likely.

Plus they'd need a total of 3x 2.5mm to get an acceptable voltage drop for a socket circuit, not really a sensible soloution

 

[ChrisElectrical88]

It’s also must be notified even if it’s your parents house as it’s a new circuit. Rip it out and start again in my opinion with the correct size cable.