How do you test an R.C.D??

[Southern Spark]

Hi guys, I remember my lecturer always said that the correct way to test an r.c.d is to test x1, x5 then test x .5. His explanation was that you have 'warmed' the r.c.d up making it more likely to trip at .5. i was wondering if anyone can verify this and give me a proper explanation as to why this is the correct way to test an r.c.d.

 

[telectrix]

if that were the case, then MFTs would auto test in that sequence. i don't think it matters if you do the x 1/2 test first or last. another way is to press the test button first, but some say this is wrong.

 

[Southern Spark]

I had though that, but unfortunately my fluke doesnt do the sequence automatically so I had got in to the habit of testing .5 after x 1 and x5. But my work mate tells me its rubbish to do it that way, and I was looking for confirmation one way or the other.

 

[Guest123]

Auto sequence RCD testing is always x .5, x1 & x5.

 

[Southern Spark]

So do you think my lecturers theory is a bit misguided?? I have tested many rcds in this way in the past 5 years, but I have never had any fail the .5 test, so I cant confirm.

 

[telectrix]

only ever seen it done with the x1/2 done 1st.

 

[ian.settle1]

When you test an RCD using the Auto setting it does x0.5 @ 0 then 180 followed by x1 @ 0 then 180 followed by x5 @ 0 then 180 but the later is only if it is 30mA or less.

So I think you lecturer is putting you on a bum steer along with other things you have been telling us he has said.

 

[SirKit Breaker]

RCD, 7 tests. for a 30mA.

x 0.5 rated trip current at 0 degrees and 180 degrees
x 1 as above
x 5 as above
Push mechanical test button to prove mechanical integrity.

I dont suppose it matters in what order you do them, just as long as you do them all.

Cheers.........Howard

 

[Electro-tech]

Maybe of use to someone.

 

[KFH]

I have seen suggestions that the 5* test should be done first in order to give the RCD a proper test in case it is sticky. My view is that 1/2 first and then 1* and it should trip at 1*. I have also been told that it is a good idea to press the test button a few times first to make sure that it is not sticky, personally I would not want to be on the end of a sticky RCD and therefore it should not be exercised before the 1* test which will be, in my view, the most difficult test for it to pass.

 

[sparky16]

I have my aca test on friday. Do you know if all 7 of these tests for rcd are in it?
Also is it easy to use the meter as i aint used rcd tester before

 

[tony mc]

Have good look at the meter before useing it and ask if at all you are not sure how to operate it.

Their are lots of meters on the market and you should be fully offay with it before you start testing dead or live !!

 

[Engineer54]

I have my aca test on friday. Do you know if all 7 of these tests for rcd are in it?
Also is it easy to use the meter as i aint used rcd tester before

What do you mean ''i aint used rcd tester before''?? By the way, i'm unfamilier with this aca test, what is it??

 

[sparky16]

Aca test is to become an approved electrician. I think there are 7 tests for the Rcd socket. Just not familiarised myself with Rcd tester

 

[Engineer54]

I have to ask, .....How can you become an ''Approved'' electrician if you haven't used an RCD tester before??
Aren't you supposed to be capable of supervising electricians and mates etc?? Also was of the understanding that you needed C&G 2391 testing and inspection to become a JIB Approved electrician??