2core swa, not earth load end.. TT

[westward10]

To the op I don't know the task you are undertaking but the EFLI or R1+R2 for the circuit from the house will be between the line conductor and armour of the cable which has been rendered inaccessible. This is the fault path for said circuit and has nothing to do with the TT arrangement. Whatever you are doing you will have to note the reading as Not Verified with the reasons.

 

[robo83]

He is trying to verify earth continuity to the armour of the cable which is not accessible as it is contained within pvc conduit to isolate it from the TT, this earth continuity is applicable to the circuit from the house and nothing to do with the TT.

Spot on.

Appoligise to everyone else for confusion.

Pete, duly noted.

The swa has been stripped back and the 2 cores run inside pvc conduit.

I did a board change after the customer had an EICR report conducted. This wasn't highlighted and only became apparent when I begun testing after the new consumer unit was installed.

 

[westward10]

Wasn't confusing at all Robo.

 

[robo83]

Thanks,

I have put LIM in the box and noted on the EIC.

They also pulled 2 strands from the other swa (another circuit) and connector blocked it and used as the cpc :/ no idea why they never glanded properly.

 

[Toneyz]

Wilko has interpreted what I was getting at lol

Exactly as Wilko said ,don't know regarding the position of the RCD however you will need loop reading /Ze +(R1+R2) to determine that the protective device for the sub-distribution circuit will operate within the maximum time for example if someone should accidently put a spade into the cable.

 

[Toneyz]

yeh but is it a circuit or just a piece of cable? Where is the loop hah!

The LINE (live) conductor SWA via the substation etc.

 

[Pete999]

To the op I don't know the task you are undertaking but the EFLI or R1+R2 for the circuit from the house will be between the line conductor and armour of the cable which has been rendered inaccessible. This is the fault path for said circuit and has nothing to do with the TT arrangement. Whatever you are doing you will have to note the reading as Not Verified with the reasons.

Will it have any reference to the choice of OCPD? cant see how as it's not being used as a cpc?

 

[The Ghost]

The LINE (live) conductor SWA via the substation etc.

Ok so you verified a piece of cable.

 

[Toneyz]

Ok so you verified a piece of cable.

Yes and I then can confirm it is safe to energise in the new consumer unit should there be a fault with the sub-distribution circuit the C.P. device will operate.

 

[The Ghost]

However the OP was asking about R1/R2 vis a vis the garage assuming I read it right I am tired and somewhat sanguine tonight.

 

[Wilko]

However the OP was asking about R1/R2 vis a vis the garage assuming I read it right I am tired and somewhat sanguine tonight.

I'm just into the 2nd glass

 

[westward10]

Jesus this is over complicated. He cannot verify continuity of the armour because it has been rendered inaccessible.

 

[The Ghost]

would I note this down as the garage r1/r2 circuit. Accepted with the 1667ohms as rcd?

The question seems to be about the garage unit

this is over complicated. He cannot verify continuity of the armour

Not the armour???

Wasn't confusing at all Robo.

I think I'll leave this subject for now night night.

 

[westward10]

His initial problem was not being to access the armour of the supply cable to verify continuity and could he record the TT results for the supply cable, answer, no.

 

[driverman]

Not that I'm into testing.....Could not the OP measure the TN Zs at incoming SWA cable at garage consumer-unit? Note reading and subject that reading from the Ze reading obtained at the house consumer unit giving R1-R2.
Another way...use Method 2 wandering lead, assuming connection can be made onto the end of the SWA armouring using a probe.

 

[westward10]

The final connection of the armour is not accessible.