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EV max demand vs. Normal high load reporting to DNO

vantech

Hi, 

A question that’s bugging me, if anyone can comment. 

We are required to notify the DNO if the maximum demand exceeds 60amps, when installing an EV charger (unless there is load management built into the EV charger). 

What I am trying to understand is how a load in excess of 60amp caused by an EV charger differs from normal, high power loads within a property. 

If we have for example: 

An induction hob/oven on a 32A circuit 

Spa/Hot tub on a 32A circuit 

Heater on a 13A plug top 

Our demand here would be 77A (plus or minus pending how the hob/tub/heater is switching its outputs - either way, it would be above 60amp give or take. 

Why doesn’t this need notifying? 

If a house with minimal loading reaches 28A and the EV charger reaches 32A, the total demand on the network is still only 60A, much less than the 77A taken in the first scenario. 

Why notify one and not the other? 

A consumer should be able to draw up to the maximum rating of the fuse surely, but is there a “limit“ when the DNO needs to be told? 

Thanks. 

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    IF you walk around a typical housing estate and count the transformers and eyeball the ratings, you will find perhaps half megawatt units supplying 50-70 properties per phase. Perhaps in very densely built up areas you will see megawatt units,  (and in flats where really big blocks may have HV risers and transformers both at ground level and part way up ) and as things get more spread out smaller sizes are used as the voltage drop and copper costs conspire to mean that most houses are within a few hundred metres of the transformer secondary that supplies them. If you have a ttransformer that feeds very few properties the average load assumptions break down, so you do not find a 50kW unit supplying 29 houses, or an 2kw supplying 

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  • 0

    IF you walk around a typical housing estate and count the transformers and eyeball the ratings, you will find perhaps half megawatt units supplying 50-70 properties per phase. Perhaps in very densely built up areas you will see megawatt units,  (and in flats where really big blocks may have HV risers and transformers both at ground level and part way up ) and as things get more spread out smaller sizes are used as the voltage drop and copper costs conspire to mean that most houses are within a few hundred metres of the transformer secondary that supplies them. If you have a ttransformer that feeds very few properties the average load assumptions break down, so you do not find a 50kW unit supplying 29 houses, or an 2kw supplying 

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