Can't test RCBO as main RCD trips first - what to do?

[vernam616]

On a TT?!?!?

Shouldnt matter if all circuits were protected by 30mA rcbos

 

[Jimmy Boy]

1) Establish by testing by ramp or device enquiry the upfront RCD type 100/30mA TD ?
2)If the upfront is 30 mA why would have other peeps fitted 30mA RCBO's ?
3) If all circuits on board are individually 30mA protected there is no requirement to have a 100mA up front, only if some are not.
4)You state the up front meets the disconnection times ? what on x1 ? and/or x5 ?
5) Establish the characteristics of the upfront, make sure it meets the regs, bridge out and test your RCBO, note the findings on the cert.

Your the last one to work on the board..It's your --- on the line if someone gets an --- winder mate do it once do it right !

 

[rich.250]

That is true, but personally would always put a S TYPE upfront if i could.

 

[rich.250]

Just cos he's the last one to work on the board doesn't mean he's responsible for it all!
Only what he's put on his cert in the extent.

 

[Jimmy Boy]

Just cos he's the last one to work on the board doesn't mean he's responsible for it all!
Only what he's put on his cert in the extent.

Agreed..BUT the OP suggested that he wouldn't test HIS RCBO and rely on an RCD ( One by his own admission he can not identify ) to give additional protection, so he either has to falsify the cert or investigate ? Failure to investigate would make him liable sorry

 

[nickblake]

Im sure if the consumer unti is metal clad or in a metalic enclosure it has to have an up front RCD ,

 

[Jimmy Boy]

Im sure if the consumer unti is metal clad or in a metalic enclosure it has to have an up front RCD ,

Nick I will swot up but I believe the the enclosure needs to be insulated with additional mechanical protection to the tails have a peek at the green OSG page 30 Figure 3.6.3 (iii)

 

[rich.250]

Agreed..BUT the OP suggested that he wouldn't test HIS RCBO and rely on an RCD ( One by his own admission he can not identify ) to give additional protection, so he either has to falsify the cert or investigate ? Failure to investigate would make him liable sorry

Yeh fair point

 

[rich.250]

You would need a Rcd for additional protection if metal, as if a tail was to touch the metal db sufficient current could not flow to operate the ocpd (DNO fuse).
Additional protection to tails by another means is fine just hard to do.

I'd go with plastic enclosure and Rcd

 

[Jimmy Boy]

OSG states insulated enclosure OR extra protection what are tails going to short on passing through a plastic enclosure ? Not critising the value of the suggestion better to be safe than sorry, just the need of it

J

 

[rich.250]

An insulated enclosure won't need one no.
But I'm not a big fan of the OSG! After all it's a guide. And wrong in many places as said on many threads.......

 

[Guest55]

Agreed..BUT the OP suggested that he wouldn't test HIS RCBO and rely on an RCD ( One by his own admission he can not identify ) to give additional protection, so he either has to falsify the cert or investigate ? Failure to investigate would make him liable sorry

Totally disagree with that.
Inform the customer of your findings in the cert and it is up to them to decide what action to take.
And why do you have to falsify anything ?
Failure to investigate makes him liable ? total crap ! the property owner is always responsible for his own installlation not the spark.

 

[Jimmy Boy]

Read the OP ! This isn't a EICR it's a new circuit that he is commissioning ! Yes he is liable if he fails to carry out and document his test results for the circuit HE has supplied, he was suggesting that he was going to neglect the RCBO test results in favour of an upfront RCD, by his own admission he doesn't know the characteristics of so what does he put on the cert ..ermmmm ?

 

[Guest55]

Well if hes prevented from carrying out certain tests due to reasons outside of his control and records this in the cert - this is not neglect , its a limitation.
And as for the details of the device that needs to recorded , he'll just have to look for the BS number on the main rcd.
And i read the op clearly , smart arse.
Your understanding of the legal obligations is sadly lacking.

 

[Jimmy Boy]

Well if hes prevented from carrying out certain tests due to reasons outside of his control and records this in the cert - this is not neglect , its a limitation.
And as for the details of the device that needs to recorded , he'll just have to look for the BS number on the main rcd.
And i read the op clearly , smart arse.
Your understanding of the legal obligations is sadly lacking.

There's no need to make childish comments, just because someone doesn't agree with your view,that's point one, point two is, you claim to have read the OP in which he states... no markings on front of RCD but assume must be 30mA non time delay.and then you say " he'll just have to look for the BS number on the main rcd."

Well he can't find it ? so what does he put in the box asking for the BSEN number ?

Keep it civil

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