R2 option over R1+R2

[Regs]

Testing.
I know you can do an R2 as oppose to R1+R2.
So, if I decided to take this route how could you check compliance, cheers.

 

[Brightspark2]

Sorry what?...

 

[Badged01]

Doing a 'Live' measurement of Zs is one way .......

 

[Steve_P]

I am really trying to understand the question. Honest I am. If you can measure R2, why can't you measure R1 and therefore R1+R2? For that matter, if you're going on a wander, why not test all 3 conductors individually?

 

[the pict]

Yep meter on loop verifies R2 present, although not the R2 value you can bugger about with maths to get it I suppose
P

 

[DJ Ovengloves]

Is this Glasgowsparks?

 

[Octopus]

Testing.
I know you can do an R2 as oppose to R1+R2.
So, if I decided to take this route how could you check compliance, cheers.

Compliance of what may I ask?

 

[Regs]

Compliance of what may I ask?

Compliance with disconnection times 0.4 and 5 secs

 

[Silly Sausage]

Compliance with disconnection times 0.4 and 5 secs

You need to know your Zs for that.
R2 just shows Earth conductor continuity, or not!

 

[Regs]

I am really trying to understand the question. Honest I am. If you can measure R2, why can't you measure R1 and therefore R1+R2? For that matter, if you're going on a wander, why not test all 3 conductors individually?

Yes R2, so referring to wandering lead. What if you don't have access to R1 and Rn, that was whole point to the question.
Thanks the pict i think you are probably right but whats the formula, would be handy to know.

 

[Regs]

You need to know your Zs for that.
R2 just shows Earth conductor continuity, or not!

Thanks.
Once you got Zs, what's the formula??

 

[Silly Sausage]

Now......this should be burnt into your mind,

Zs = Ze + (R1 + R2)

 

[SJD]

Now......this should be burnt into your mind,

Zs = Ze + (R1 + R2)

But you shouldn't subtract Ze from Zs to get (R1 + R2).

 

[Geoffsd]

What if you don't have access to R1 and Rn, that was whole point to the question.

Why would you not have access?

 

[Regs]

Why would you not have access?

??Because you can touch the outside metal casing to items if they are fixed and for whatever reason can't be accessed, moved or just generally to expensive to get involved with. Common sense no??