Sorry what?...
B
Badged01
Doing a 'Live' measurement of Zs is one way .......
S
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?
D
DJ Ovengloves
Is this Glasgowsparks?
O
Octopus
Compliance of what may I ask?
Compliance with disconnection times 0.4 and 5 secs
S
Silly Sausage
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.
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??
S
Silly Sausage
Now......this should be burnt into your mind,
Zs = Ze + (R1 + R2)
Zs = Ze + (R1 + R2)
But you shouldn't subtract Ze from Zs to get (R1 + R2).
G
Geoffsd
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??
4
44ALLAN
Yup you have it in one..............best explanation ever well done mate you have it sussed
Ah come on your not being fair here, that is burn trust me but:-
You said you would have to know your Zs, when infact you would have to know your Ze also
And even if you knew these you would have to rearrange this formula to something like
Zs-Ze-R2=R1
Cheers 4 help anyhow.
Yup you have it in one..............best explanation ever well done mate you have it sussed
Pff and i didnt even get a thank or like
lol, ive learn something then.
4
44ALLAN
Pff and i didnt even get a thank or like
lol, ive learn something then.
I'll give you a thank 'and' a like if in your next post you tell me the difference between Zs and Ze...............can't be fairer than that mate.
you have 5 minutes to look it up
S
Sintra
Absolutly not. Love to know where it says that.
4
44ALLAN
Soggy conductive mars bar from last night ok?
I'll give you a thank 'and' a like if in your next post you tell me the difference between Zs and Ze...............can't be fairer than that mate.
you have 5 minutes to look it up
only just read- Ze is external
Zs is whole shabang anything a bit harder?
If you measure R2 this is your confirmation that your cpc is safely connected from the MET to the accessory.
Once you know this and that your IR tests are OK, then you are safe to start live testing.
You would then use Zs to confirm polarity and that your circuit would meet the required disconnection times.
Once you know this and that your IR tests are OK, then you are safe to start live testing.
You would then use Zs to confirm polarity and that your circuit would meet the required disconnection times.
Rearranging Zs = Ze + (R1 + R2) to (R1 + R2) = Zs - Ze looks good on paper, and is mathematically correct, but in practice you can measure R1+R2 a lot more accurately than Zs or Ze.
Also, Ze is measured with bonding and parallel paths disconnected whereas Zs is measured with parallel paths in place, so subtracting Ze from a measured Zs doesn't necessarily give R1+R2.
Zs - Ze to gain R1+R2 is not acceptable at all.
Ze + R1+R2 to gain Zs is acceptable if I am correct.
On initial verification I will always do all tests and on EICRs I tend to do R2 and Zs of each circuit.
Ze + R1+R2 to gain Zs is acceptable if I am correct.
On initial verification I will always do all tests and on EICRs I tend to do R2 and Zs of each circuit.
Thank you very much Mr Burns, perfect answer of what i was looking for. I couldn't get my head around the fact that an R2 test alone was sufficient. This only confirms continuity as you have kindly pointed out.
It is very confusing as on the test sheets it does say R1+R2 OR R2, implying just an R2 would be acceptable. I was scratching my head thinking how is that going to comply with the required times.
Well i'm glad some 1 understands me at last.
O
Octopus
R2 is best used when doing EICR's to light fittings.
For new installation work the R1+R2 is best, then you can confirm polarity at the same time.
For new installation work the R1+R2 is best, then you can confirm polarity at the same time.
Well you guys obviously know a lot more than i do, so o.k but isn't there not some exceptions?
G
Geoffsd
Just because R2 is all you need to record does not mean that is all you should test.
So you don't have access to Line or Neutral ? How does the lamp light up when switched on?
S
Sintra
No not in my book. Do it once and do it right without trying to make your live easier by taking shortcuts that will come back and bite you.
Just out of interest how much would you charge for a 10 circuit domestic EICR?
S
Sintra
Would then changing a consumer unit count as new installation work as you are not installing any cables they are existing in regards to R1+R2. Think about what i'm actually asking here instead of getting boot in. (I know it would be an EIC before you start with the funny answers). If you dont get the question just ask me, cheers
S
Sintra
As you are changing the consumer unit you have to prove by means of testing that existing circuits are safe to be energised.
Yeah i get that, but
you haven't altard as such any circuits from CU onwards so do you still need to R1+R2?
4
44ALLAN
Originally Posted by Murdoch
R2 is best used when doing EICR's to light fittings.
For new installation work the R1+R2 is best, then you can confirm polarity at the same time.
You need to listen and learn what the guy is trying to tell you mate..............he knows what he's talking about.
Out of interest..............how old are you?
and that is not asked in any way shape of form in a patronising fashion you ignorant young idiot..............last few words were a joke btw
Similar threads
OFFICIAL SPONSORS
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
Advert
Thread Information
Advert
Thread statistics
Advert
TrueNAS JBOD Storage Server
-
-
-
Understanding TrueNAS JBOD Servers: A Comprehensive Guide- Started by Dan
- Replies: 8