Improving trip times

[rmaynard]

Is this possible with an rcbo? I have just finished testing a new install and one of the ring circuits gives me 38.6ms on 5x test, it's the only circuit with high readings all the others are well below 15ms
Cheers

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[trev]

Forgive me for stating the obvious but have you tried swapping that RCBO with one thats tripping quickly?

 

[rmaynard]

Yeah it was the first thing I tried, this one thats on now is the lower of the 2 I tried

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[jaresquire]

Tried testing the RCBO directly,without the final circuit connected?

 

[Deleted member 26818]

Are you saying, that both devices are slow when used with this circuit?

 

[Octopus]

Are you saying, that both devices are slow when used with this circuit?

Good question!

 

[vbyrne]

I was browsing this thread and would like to know what are the tripping times for the RCBO's

 

[Octopus]

I was browsing this thread and would like to know what are the tripping times for the RCBO's

Do you not have a BRB or a BGB or an OSG?

 

[vbyrne]

ok.just being lazy

 

[mechelec]

At 5 times rated current the device should trip in less than 40ms? Not really sure why your reading of 38.6 ms is a problem. If you are testing at the CU the connected load can be dismissed as being the problem if you are testing at the far end of the circuit try it at the CU. It does not matter at what point you test them.

 

[rmaynard]

At 5 times rated current the device should trip in less than 40ms? Not really sure why your reading of 38.6 ms is a problem. If you are testing at the CU the connected load can be dismissed as being the problem if you are testing at the far end of the circuit try it at the CU. It does not matter at what point you test them.

changed it out for an rcbo from different stock and the times have reduced by half for this circuit, i know it was below the threshold being 38.6 but i would of just liked them all to be roughly the same, bit picky me

 

[jaresquire]

Any 'connected load' with reactance will affect rcd/rcbo trip times