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Diversity settings for apartment blocks and ADMD standard norms

Dylan Wilding

I'm looking at calculating a total diversified load for a small apartment block. Using Table A2 in the OSG i am able to get the majority of the diversity settings however does anyone know of any standard norms when it comes to diversity considering the amount of apartments. Say for example the total diversified load per apartment is 50A and there is 8 apartments. Technically you would need a 400A capable supply to feed these apartments however this doesn't take into account that not all apartments will be drawing their maximum load at any one time.

I have come across a french standard  NFC14-100 which gives correction factors depending on the amount of apartments you have. Estimation of actual maximum kVA demand - Electrical Installation Guide

Does anyone know of anything similar in British standards or standard norms used by the DNO for this?

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  • 0 in reply to AJJewsbury
    AJJewsbury said:
    DNO figures tend to look rather low to BS 7671 eyes - but should give you an idea at least.

    The reason for this, is that in general for the electrical installation, we need to design for safe surface temperatures of cables (not applicable most of the time to DNO cables as they are buried or placed out of reach), and conductor temperatures of 70 deg C to match the thermal conditions for equipment terminals.

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