RCBO 5In trip times.

[ste mac]

Just installing a new consumer unit for a customer. Split load board with 1 half RCD & the other half RCBO's. RCD & all but 1 RCBO has had good trip times, all sub 40ms at 1In & 5In, but the 6A RCBO for the kitchen lighting circuit is tripping at 40.8ms & 40.7ms at 5In. If I disconnect the outgoing live & retest the the trip times are 18.5 & 17.2. Anyone shed any light as to why this is happening & is it acceptable to test the RCBO without the outgoing ways connected?

 

[Guest55]

Biff your tall on knowledge and frankly short on manners, and this is exactly what ****es people off, you clearly are an educated spark so WTF do you need to antagonise people ?..You have the knowledge base so use it to educate matey. I dunno if you get a kick out the wind up..but it's not an attractive trait, I say again you are clearly talented, so wind your neck in and see what is in front of you
J

Well i was polite enough for the first 2 hours of that thread , and crossfire was hardly a picture of courtesy and would have tried the patience of a saint.
Go and wind youre own neck in.

 

[Amp David]

OP

If your tests prove ok with the circuit disconnected then there no problem, as you're supposed to test with no loads connected.

 

[Noah09]

I always thought an RCD/RCBO had to be tested out in the field. Thanks for the info!

I suppose it is very logical. An RCD trip time test is purely to test the function of the device, not the wiring.

 

[GLENNSPARK]

Just installing a new consumer unit for a customer. Split load board with 1 half RCD & the other half RCBO's. RCD & all but 1 RCBO has had good trip times, all sub 40ms at 1In & 5In, but the 6A RCBO for the kitchen lighting circuit is tripping at 40.8ms & 40.7ms at 5In. If I disconnect the outgoing live & retest the the trip times are 18.5 & 17.2. Anyone shed any light as to why this is happening & is it acceptable to test the RCBO without the outgoing ways connected?

and just a reminder..
In is fuses & breakers

I delta n is RCDs....

 

[GLENNSPARK]

hmm...
i think i`v seen enough here already...
dont know why folk keep testing RCDs with loads connected though....bloody common sense isn`t it?

 

[telectrix]

i test RCDs by plugging in at a convenient socket. why? because it's easier. however, if i get unacceptable results, i'll then test at CU with circuit disconnected. on a new install. i'd test at CU before connecting circuits. all down to whatever takes the least time.

 

[GLENNSPARK]

i test RCDs by plugging in at a convenient socket. why? because it's easier. however, if i get unacceptable results, i'll then test at CU with circuit disconnected. on a new install. i'd test at CU before connecting circuits. all down to whatever takes the least time.

wrong...
its the highest values recorded...
i`m surprised at you Tel...i really am....:nonod:

 

[trev]

Never mind.

 

[GLENNSPARK]

I'm guessing that Tel meant whatever takes the least time to do.

and its 1-0 to the Glennster...lol...