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Demand and Diversity Assessment

Philip Conlan

I have come across an old commercial site with several boards/sub-boards non of which have been considered for selectivity with MCBs or RCDs.

When looking at the demand and diversity from 1 supply nothing seems to add up, or either I'm looking at this all wrong.

DB2 I would assume that the demand after diversity is too great for 1-the 6mm cable CCC and 2-the 32A MCB supply from DB1 is underrated.

if anyone could provide some clarity on this installation that would be helpful.

Currently, I'm working my way through the IET design guide and trying to get a better understanding.

Thanks

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    So the purpose of this is for an EICR for part of a commercial/industrial site, but not carried out by myself, I'm trying to understand what the best solution would be 

    This part of the installation is currently without any tenants but the Site manager is wanting to fill his units up hence the EICR and getting the installation made safe. So, as there isn't much usage at the moment it's hard to determine if the current setup is reliable, although they have reported some tripping in the past. 

    There is a second part to this installation with 3 and 4 boards in series non of which have any discrimination. As mentioned in a previous message, it's evident there has been a multitude of additions over the years.

    I am working with the site owner who will be upgrading the incoming supply to the whole site soon, roughly 20 businesses. So a new supply location and new cables will be supplied to all sub-mains on site. So trying to see if it's worth convincing the particular site managers to upgrade their installations at the same time, only if justified.

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  • 0

    So the purpose of this is for an EICR for part of a commercial/industrial site, but not carried out by myself, I'm trying to understand what the best solution would be 

    This part of the installation is currently without any tenants but the Site manager is wanting to fill his units up hence the EICR and getting the installation made safe. So, as there isn't much usage at the moment it's hard to determine if the current setup is reliable, although they have reported some tripping in the past. 

    There is a second part to this installation with 3 and 4 boards in series non of which have any discrimination. As mentioned in a previous message, it's evident there has been a multitude of additions over the years.

    I am working with the site owner who will be upgrading the incoming supply to the whole site soon, roughly 20 businesses. So a new supply location and new cables will be supplied to all sub-mains on site. So trying to see if it's worth convincing the particular site managers to upgrade their installations at the same time, only if justified.

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