what to do if the rcd fails and its brand new??

[smiffey]

Hi all,

I have put a new cooker feed into a customers house, i went back today to second fix and test but this is where it goes ---- up! well testing i got-

Ze = 0.25
PFC = 966
r1+r2 = 1.22
insulation resistance of >500

I thought the r1r2 was a little high but its on a 10mm so thought it was acceptable.
when i came to do the rcd test i put the plug lead in my 1653 set it to " rcd time" and AUTO. pushed test and went to the rcd and began resetting the rcd when it tripped as normal. when i reviewed the test results they were-
1/2@0- 310
1/2@180-310
[email protected]
[email protected]
[email protected]
[email protected]
so it failed at 1@0 degrees but its brand new what so i do? I bought it from screwfix a few months back and had it as stock so i cant return it to them! i also wouldn't want to as they want the hole board back... F that. what do i do contact mk or just have to hold the bill of a new rcd? Has anyone else had any problems like this?

cheers in advance Smiffey

 

[mark1979]

it has to trip at under 40 milliseconds on x5 so it has passed. it seems to be under 40 milliseconds at x1 too

 

[DaveyD]

Do you mean R1+R2 is as high as 1.22 on a 10mm Twin and earth?

 

[robsparky1975]

Well within limits on the 1x rcd test,R1 & R2 sounds high,possible bad connection on leads, i would take a reading again then take off resisitance of leads.

 

[Des 56]

Do you mean R1+R2 is as high as 1.22 on a 10mm Twin and earth?

Well it is almost 2 football fields long

DaveyD was not impressed with that figure,me neither

 

[DaveyD]

Well it is almost 2 football fields long

DaveyD was not impressed with that figure,me neither

LOL, yes 25m of 10mm T&E is about 0.16

 

[Richard Burns]

I notice that whilst it has passed on all the 1x and 5x tests it is also tripping on the 1/2x tests which it should not do (at least within 2s). Make sure there are no loads on the RCD and test again (at the RCD perhaps).
1.22 on 10mm sounds high but could be from resistance at junctions, just make sure you have all screws tight.

 

[MarkieSparkie]

Your R1+R2 is stratospheric high mate at 1.22 Ohms you should have a final circuit with a cable run of nearly 190m in 10mm T+E to justify it. To quote John McEnroe " You cannot be serious!" With a dead test failure you should not have energised the installation.

 

[smiffey]

Thanks for pointing that out daveyd and des56
I did not energise the new cooker feed as i thought it was unacceptable but my iphone auto corrected it. The house is still a building site so im going back up when they want me to connect the cooker. The run is only 4 meters long with a cooker switch from ebay as the customer wanted to save money and a cooker outlet under the worktop. When i go back up i'll retest and make sure the leads are ok and that the connections are all tighter as ive done them up tight already.

With the rcd i thought Device should operate in less than 300ms unless it is of‘Type S’ (or selective) which incorporates an intentional
time delay. In this case, it should trip within a time range
from 130ms to 500ms and at 5x it was the 40ms? so will it pass even tho its over the 300ms at 1x

 

[SPARTYKUS]

Hello smiffey

- are you saying the RCD is of type "S" ?

The bit at the bottom's straight out of the OSG ( :shades_smile: ) - which bit don't you understand.

It's easy really. At x 1/2 it shouldn't trip

At x1 it should trip, but under 300mS
At x5 it should trip under 40mS (but this is only for 30mA RCD's, not 100mA or anything else). You can forget this test for other-than-30Ma-RCDs :smilielol5:

 

[malcolmsanford]

Hi all,

I have put a new cooker feed into a customers house, i went back today to second fix and test but this is where it goes ---- up! well testing i got-

Ze = 0.25
PFC = 966
r1+r2 = 1.22
insulation resistance of >500

I thought the r1r2 was a little high but its on a 10mm so thought it was acceptable.
when i came to do the rcd test i put the plug lead in my 1653 set it to " rcd time" and AUTO. pushed test and went to the rcd and began resetting the rcd when it tripped as normal. when i reviewed the test results they were-
1/2@0- 310
1/2@180-310
[email protected]
[email protected]
[email protected]
[email protected]
so it failed at 1@0 degrees but its brand new what so i do? I bought it from screwfix a few months back and had it as stock so i cant return it to them! i also wouldn't want to as they want the hole board back... F that. what do i do contact mk or just have to hold the bill of a new rcd? Has anyone else had any problems like this?

cheers in advance Smiffey

Sorry smiffy your last post is quite confusing @ x1 your results I've highlighted and if they are 34.1 and 24.6 mS values then they are acceptable, where has the plus 300mS for x1 come from.

What i'd be more concerned with is

1 The high R1+R2 you have either a loose connection or a poor accessory.
2 Did the 1/2 test trip the RCD? if it had then you have a faulty RCD or there is a load affecting it.