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Volt drop % - Private Supply Def

Peter Hartley

Good day everyone 

Public supply Volt drop 3% Lighting 5% Power.

Private supply Volt drop 5% Lighting 8% Power.

Define private supply?

Option 1 - HV public grid supply to privately owned transformer. Is LV supply private?

Option 2 - Main source of supply is from Privately owned source of generation such as PV, diesel/gas/nuclear generator?

Why is this not defined in BS7671?

Parents
  • 0

    A private supply is defined by BS 7671 as a supply that comes from a non-public source of energy. Therefore, the second option in your question is the correct one. A private supply can be produced by different types of generators, such as PV, diesel/gas/nuclear, or batteries. The first option in your question is not a private supply, because it still depends on the public grid supply at the HV level. The private transformer only changes the voltage level, not the source of energy.

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  • 0

    A private supply is defined by BS 7671 as a supply that comes from a non-public source of energy. Therefore, the second option in your question is the correct one. A private supply can be produced by different types of generators, such as PV, diesel/gas/nuclear, or batteries. The first option in your question is not a private supply, because it still depends on the public grid supply at the HV level. The private transformer only changes the voltage level, not the source of energy.

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  • 0 in reply to AMK
    AMK said:
    A private supply is defined by BS 7671 as a supply that comes from a non-public source of energy.

    BS 7671 certainly talks about private sources and private transformers - both not really directly relevant in terms of the particular issue we are discussing?

    Where is "private supply" defined in the standard? (certainly not in Part 2).

  • 0 in reply to AMK

    Thanks, that's my thiughts as well. But do you know where this in the book this is defined? 

  • 0 in reply to Peter Hartley

    Apologies for the spelling, trying to watch the rugby and type at the same time. Do you know where this distinction is made?

  • 0 in reply to AMK

    A private supply is defined by BS 7671 as a supply that comes from a non-public source of energy. Therefore, the second option in your question is the correct one. A private supply can be produced by different types of generators, such as PV, diesel/gas/nuclear, or batteries. The first option in your question is not a private supply, because it still depends on the public grid supply at the HV level. The private transformer only changes the voltage level, not the source of energy.

    But aren't the sun and wind "public" energy? PV and turbines merely convert energy from one kind to another, rather than create it.

       - Andy.

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