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intelegence
kevelec
#1 Posted : 14 June 2010 21:03:48
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in minor works intelegence does not higlight large values of time for RCCD trip times eg 5* > 40ms
Rob
#2 Posted : 14 June 2010 22:37:14
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RCD intelligence will trigger if you have one of the following selected as the Circuit OPD

BS 61009 (either B, C, or D)
BS 61009(S) either B, C or D)

It will NOT trigger if you have a 61008, as this is NOT an overcurrent device and should not be treated as such. A 61008 is purely an RCD and not an RCBO, therefore can't be used as an overcurrent device. This is why there are no characteristics for this type.

For a 61009, the tripping times at In are >300ms and >40ms at 5In (Intelligence will trigger)
For a 61009(s) the triping times must not be below 130ms and above 500ms at IN (Intelligence will trigger)
For a 61009(s) the tripping times must not be below 40ms and above 150 ms at 5In (Intelligence will trigger)

Make sure you have the correct OPD type selected to make sure the above works correctly.

This is the same across all the certificates and reports.

kevelec
#3 Posted : 19 July 2010 20:32:30
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In the Niceic minor works form there are separate details for the OPD and
for the RCD device.
I would need to be record (BS TYPE and mA) in separate boxes this would then enable the intelagence to pich up any slow trip times for the RCD in the opperating times.

In the Electrical installation / periodic inspection circuit details and test results the same thing happens if yoy have a type B MCB and enter 30mA for the RCD then enter a slow disconnection time the intelagence does not flag a problem either

The above can happen when you have a split load board with separate RCD and OPD devices

Rob
#4 Posted : 20 July 2010 14:17:08
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Kevin, the OPD would need to ne a 61009 RCBO as shown in the image. A 60898 does not have any associated tripping times in relation to RCD's RCBO's
If the circuit is a split board, then the board can be constructed in the second image

Image 1:



Image 2:



I hope this answers your question.

Rob

Rob
#5 Posted : 20 July 2010 14:32:38
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In addition, the RCD associated to the boards section can be used where an RCD is either the main switch for the board, or as a split.



kevelec
#6 Posted : 20 July 2010 17:52:31
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Yes i understand that it works for RCBO but split load 17th edition boards have two RCD which can have different trip times and it is not very often you use separate RCBO for domestic installations.
Also I need to record the other items mentioned on the minor works form.
Rob
#7 Posted : 20 July 2010 20:20:23
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The image below will show how to achieve what you are requiring for a split board with 2 RCD's. The associated RCD at the top is the main switch, and you can enter something similar in the circuit designation to achieve a split board with the other RCD characteristics.





The Minor Works Certificate is based on the model in BS 7671, and only requires the details and test results of the modified circuit, not the associated switchgear. Hence, if the modified circuit is not an RCD or RCBO, then there is no requirement to test it.

I do understand what you are asking for here, and is a valid point, but is something that is specific to your scheme operator and not BS 7671. We may however look at including the provision in future versions of PIRform.
If you are concerned about not providing all the required information, then as long as the certificate complies to BS 7671 (which ours does) then you are also complying.
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