pscc

[ipf]

Lazenby had a bloody big FRY

 

[Geordie Spark]

Lazenby had a bloody big FRY

That's good.

Tidyboiler enjoys a bloody big fry up first thing in the morning.

 

[tidyboiler]

No pet ... there's nothing like a good Roger is there?

As in "Roger the cabin boy".............. :ninja:

 

[ipf]

Aye, thought she'd be up for a bit of Turkish Delight with her sausage and scrambled.

 

[Geordie Spark]

As in "Roger the cabin boy".............. :ninja:

Stoppitnow .... before you go any further. :38:

 

[telectrix]

awwww. just because it's your turn in the barrel.

 

[ackbarthestar]

dead test R1+Rn. then PSCC= 230V/( R1+Rn).

I can't see how that will work, IMO, as the OP will need access to the front end of the cct. So its a guesstimate.

Since you'll need Zline ext. + R1 +Rn of the sub-main and as the OP doesn't have access to either then its going to be a calculated value based on assumptions about the supply cable type, size, length and the same for the sub-main cable.

We're not even sure whether the supply earthing arrangement is TN or TT, only that the far end supply is TT'd so we might struggle to get a reasonable supply voltage off and on load and calculate the resistance from the volt drop at the far end....

I'd just go for the 'drive-by' calculation if I was you.

that is:
Guess one + guess two + Variations in terminal resistances through various in line connections = 0.5 Ohms

This calculation is only for advanced users only - not recommended for the barn stormer

 

[telectrix]

as OP said he had access to switch fuse supplying his installation, i assumed he wanted the pscc for that point.

 

[Jdsparky]

My suggestion is do the live "no trip" test, or normal one and hope for the best,if it trips knock the door and say can you reset the Rcd please, then resort to other methods....how can you do all the other tests you may need to do at the origin of supply?

 

[ackbarthestar]

hi have access to the fused connection unit, that the supply comes from in utility room, but the lovely.... householder would not allow access into main house, must of thought i was an electrician who is also a burglar ho ho, we cant choose are customers, well we have a bit of lee-way. all done now using R1 + Rn method
230/(R1+Rn)

Ok, so R1+ Rn from the utility room to the outside installation which can be measured.
We still have R1 + Rn from the DB to the Sw Fuse, Zline ext plus a bit for terminal resistances.....

Just a few thoughts