Annoying simple circuit

[Ldm]

hi ladies and gents

I have opened a ring final circuit to add 3 sockets. All was goin well till I powered it up and it keeps tripping. I have tested and IR comes back fine. continuity also fine, all test readings are fine. the circuit has 9 sockets and has a 32 type c rcbo. any other info needed please ask.

sorry for the short message but my keyboard is dying.

thank you

 

[telectrix]

does it trip with nothing plugged in? if it requires a load to make it trip, you may have a N-E reversal at a socket.

edit: it would help if you told us your level of expertise.

 

[Pete999]

hi ladies and gents

I have opened a ring final circuit to add 3 sockets. All was goin well till I powered it up and it keeps tripping. I have tested and IR comes back fine. continuity also fine, all test readings are fine. the circuit has 9 sockets and has a 32 type c rcbo. any other info needed please ask.

sorry for the short message but my keyboard is dying.

thank you

You must have wired it wrong, check all the new connections

 

[Simonslimline]

does it trip with nothing plugged in? if it requires a load to make it trip, you may have a N-E reversal at a socket.

edit: it would help if you told us your level of expertise.

Trainee according to the profile.

 

[mydigitalhome]

As above, dead testing first, continuity check should have picked it up.

 

[Plonker 3]

Is the RCBO existing or a new one that you have installed?

 

[shanky887614]

check an old socket and the new ones.

the terminals might be in a different place.

you wont pick it up with end to end testing if you connected it up wrong
and this would cause it to trip when you plug something into a new socket

 

[Plonker 3]

you wont pick it up with end to end testing if you connected it up wrong
and this would cause it to trip when you plug something into a new socket

No, but a R1+R2 test will pick it up.

 

[shanky887614]

No, but a R1+R2 test will pick it up.

how?

if he has put both browns in N both blues in E and all the cpcs in L

it wont come up on end to end if there is nothing plugged into socket.

the figure of 8 R1+R2 only checks the resistance not if the cables are in the right terminal in the socket

 

[1stfix2ndfix]

This is where my little socket tester would come in handy

 

[Simonslimline]

This is where my little socket tester would come in handy

The one i have will not detect a neutral & earth reversal.

 

[Simonslimline]

how?

if he has put both browns in N both blues in E and all the cpcs in L

it wont come up on end to end if there is nothing plugged into socket.

the figure of 8 R1+R2 only checks the resistance not if the cables are in the right terminal in the socket

Are you sure about that!

 

[happysteve]

how?

if he has put both browns in N both blues in E and all the cpcs in L

it wont come up on end to end if there is nothing plugged into socket.

the figure of 8 R1+R2 only checks the resistance not if the cables are in the right terminal in the socket

I guess it depends on whether you do R1+R2 from the front of the socket (in which case you will spot an error) or the back of the socket (in which case, if you're going by wire colour, you won't).

Maybe this points towards why it's a good idea to do it from the front...

(Trainee )

 

[shanky887614]

Are you sure about that!

yes when you do the test at the board.

obviously it would be obvious if testing at each socket

most firms only check at the board though

 

[Simonslimline]

yes when you do the test at the board.

obviously it would be obvious if testing at each socket

I thought the whole point of the test is to check all the outlets connected. The tests will also pick up a ring within a ring.

 

[Simonslimline]

yes when you do the test at the board.

obviously it would be obvious if testing at each socket

most firms only check at the board though

How do you know this out of interest? Not exactly proper practice IMO.

 

[shanky887614]

How do you know this out of interest? Not exactly proper practice IMO. [emoji2]

ive tagged along with several firms in the past and been on building sites etc where they dont bother.

on a side note, have you guys seen demma installs, to say there a birds nest is an understatement

brand new bms installs with hundreds of cables tywrapped to ceiling grid etc with no support, i would feel embarrassed installing it but the clients dont mind it because they dont have to pay them for containment!!!!

 

[Simonslimline]

ive tagged along with several firms in the past and been on building sites etc where they dont bother.

Well its not the way i was taught at college. We always did the full test with my old company.

 

[shanky887614]

Well its not the way i was taught at college. We always did the full test with my old company.

i only did the full range of tests once or twice at college, during exams

 

[davesparks]

The correct way to test a ring final circuit includes the end to end tests, the figure of right L to N and figure of eight L to E.
Both figure of eight tests should include readings taken at all points, or as many as realistically practical depending on whether it is IV or periodic testing.