Testin a new ring

[Cazmac1]

I just started to test a new installation. I wired all the flats and am confident the the ring is indeed a ring. I have done continuity tests to check there are no open circuits.
My question do I need to do an R1 + R2 tests. and is it possible to determine the r1 + r2 by adding zs to ze on the ring or does this bring up a different figure

 

[gpz900jim]

no, adding the ze to the highest r1 plus r2 on the ring will give you the zs reading

 

[james king]

i think u need to do r1+rr2 in the test schedule and i think im right in saying u can add r1+r2 to Ze to get your Zs for tht circuit

 

[Guest123]

You cannot calculate R1+R2 using the formula (R1+R2) = Zs-Ze, as when measuring Zs the parallel paths via any protective bonding will be included and therefore will not be a true reflection of R1+R2.

 

[ukpablo]

why are u even asking this....................................to comply with bs7671 u have to test the ring, to confirm polarity(which u said u did), and all readings are what should be expected?

Also it will show a higher figure if u are measuring a spur, if u have any on the ring.??? The R1+R2 test will prove that all readings are the same if the skts are indeed in the ring (terminals are not loose etc) and that u do not have any crossed polarity on any of the sockets (ie live in the N connection at skt plate)

 

[Cazmac1]

Thanks I think I just stick to the correct method, Just haven't done any testing for years and was looking for a way to speed things up.
R1 +r2 It is then thanks everyone. Newbe

 

[Guest123]

Guidance Note 3 would be an excellent investment if you need to 're aquainte' yourself with insp & test.

 

[Sintra]

r1, rn, r2 followed by R1 + R2 followed by IR all before the circuit is energised.

Testing should not be "speeded up" it takes as long as it takes end off.

 

[Deleted member 9648]

Suggestion to all.....dont buy one of those flats

 

[ezzzekiel]

Testing should not be "speeded up" it takes as long as it takes end off.

having said that a lot of firms you will work for do not take this into consideration !!!!

 

[telectrix]

i am amazed at how many sparks get confused between R1 and r1 etc. can't all be put down to typos

 

[Judgeshred39]

Concerned! but not as concerned as the new tenants of these flats should be!

 

[ian.settle1]

having said that a lot of firms you will work for do not take this into consideration !!!!

Agree but it is you that ends up in court should anything goes wrong as it is YOUR NAME on the cert who carried out the actual testing.

 

[tonys]

I'm getting concerned with everything I'm reading just lately, I knew there was a lack of trained people out there, but this forum brings the problem more in the open.

Asking simple questions on basic testing, omg