What a normal r1 = r2 result should be on a light circuit

[scintillasam]

Hi,

I just done a job today and got some reading of 7ohms, on continuity of a light circuit (B6 CB) this is the highest I have yet seen
is this still ok? Or is this a problem?

Cheers

 

[telectrix]

either you've got an extremely long circuit, or bad connections. yes. 7Ω is a priblem

 

[scintillasam]

either you've got an extremely long circuit, or bad connections. yes. 7Ω is a priblem

I figured this as the circuit is quite short what sort of reading should I be expecting for about 20 meters?
Thanks

 

[telectrix]

about 0.7Ω-- 1/10 of what you say you are getting.

 

[Geordie Spark]

about 0.7Ω-- 1/10 of what you say you are getting.

Has the OP put his dismal point in the wrong place I wonder?

 

[telectrix]

if so i nominate him for one of these:

and when are some guys going to learn the difference between r1 an R1? it's like meerkat and market. different words, different meanings. ssssimplesss

 

[KFH]

Was there a switch in circuit? Poor/dirty contacts can cause high readings. Operating the switch a few times will often produce a better results.

 

[GLENNSPARK]

Hi,

I just done a job today and got some reading of 7ohms, on continuity of a light circuit (B6 CB) this is the highest I have yet seen
is this still ok? Or is this a problem?

Cheers

theres no fixed value for R1 R2....just a suitably low value....but 7 ohms?...
come on what do you think...
for a start it wont meet a Zs for a 6A MCB to BSEN60898...will it...

 

[GLENNSPARK]

if so i nominate him for one of these:

and when are some guys going to learn the difference between r1 an R1? it's like meerkat and market. different words, different meanings. ssssimplesss

yep...basics as well Tel...

 

[R G]

Do an R2 test with a long lead start nearest point and work further away and see what you get

 

[Heisenberg]

Has the OP put his dismal point in the wrong place I wonder?

You're either atrocious at spelling or that is some very clever word play :thinking:

 

[Octopus]

Move to another point on the lighting circuit and retest then compare the readings.

Loose connection IMHO - are the CPC's twisted together or connected "properly"?

 

[Pondy]

Is the circuit rcd protected, if it is then theoretically the maximum zs allowed is 1667 ohms

 

[Geordie Spark]

You're either atrocious at spelling or that is some very clever word play :thinking:

There's nowt rang wi' me spellin' bonny lad.

 

[Octopus]

Is the circuit rcd protected, if it is then theoretically the maximum zs allowed is 1667 ohms

Maybe BUT relying on RCD's is not ideal IMHO

 

[GLENNSPARK]

Is the circuit rcd protected, if it is then theoretically the maximum zs allowed is 1667 ohms

yes...but would you just rely on that?

- - - Updated - - -

sorry...didnt see #15...lol...

 

[Pondy]

Thats why I put theoretically. Done an ecir last year where the tenant had a very damp wall and the zs was 316 ohms! My boss told me to leave it as that was within regs. Don't agree with it myself

 

[GLENNSPARK]

Thats why I put theoretically. Done an ecir last year where the tenant had a very damp wall and the zs was 316 ohms! My boss told me to leave it as that was within regs. Don't agree with it myself

no...its p!ss poor....
we have the means to get it down to a decent level....so why take the half arsed approach to it all?...
beats me....

 

[Octopus]

Thats why I put theoretically. Done an ecir last year where the tenant had a very damp wall and the zs was 316 ohms! My boss told me to leave it as that was within regs. Don't agree with it myself

Thats why the EICR needs a C4 - requires investigation.

 

[GLENNSPARK]

Thats why the EICR needs a C4 - requires investigation.

well the old version did...lol...but methinks the Electrical Trainee were `getting a bit confused`...lol...
too many codes see....lol..