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Trimble Pro Design - Energy Let Through & Adiabatic Issues

SparkyKris

Hi All

I’ve been in the industry for about 20 years but only just started to do some small designs on Trimble Pro Design Software. So far on the last hand full of projects been relatively problem free but on this particular project I’ve been having issues the prospective fault current. A direct measurement on site has been done as Ze 0.04 (5.8kA). The first issue I had is we are planning to fit Hager combined AFDD/RCBO which are rate at 6kA. As these will be protected by a Hager 200A MCCB its allows me to use back up protection which has now cleared the error. But the issue i have now is the Line & Earth Adiabatic equation is now throwing up errors on all my circuits. I believe the software’s may be think my 16A circuit with 2.5mm T&E is relying on solely the 200A for short circuit protection? On some it’s saying my CPC needs to be at least 13.5mm. I have tried everything I can to think of but with no luck. Can anyone shed some light on this, in particular if you use the software yourself. Thanks in advanced.

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    Hi, to help with the issue you are experiencing with Trimble Prodesign software, you may be required to provide more information to get the issue resolved.

    However, a quick look at the brief information provided, a manual fault calculation for a Ze of 0.04Ohms, 5.8kA will be an estimated fault current for a single phase circuit but the fault current of a 3phase is at about 10kA. 

    I am not too conversant with Hagger's product but my quick check of your issue shows that the Hagger's 200A MCCB cannot provide more than 10kA back up protection for Harger's 16A AFDD/RCBO device and the software's Pscc is is at 15.3kA.

    To get things resolved, I would advice you check Hagger's selectivity tables for back-up protection to see the range of options to explore.

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  • 0

    Hi, to help with the issue you are experiencing with Trimble Prodesign software, you may be required to provide more information to get the issue resolved.

    However, a quick look at the brief information provided, a manual fault calculation for a Ze of 0.04Ohms, 5.8kA will be an estimated fault current for a single phase circuit but the fault current of a 3phase is at about 10kA. 

    I am not too conversant with Hagger's product but my quick check of your issue shows that the Hagger's 200A MCCB cannot provide more than 10kA back up protection for Harger's 16A AFDD/RCBO device and the software's Pscc is is at 15.3kA.

    To get things resolved, I would advice you check Hagger's selectivity tables for back-up protection to see the range of options to explore.

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