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Powering the Shard

Former Community Member
Former Community Member
Afternoon one & all


I know we have single and three phase power, single mainly for domestic and three phase for commercial and small industrial.  But what sort of supply would The Shard have, does it have several 3 phase supplies or does it have an even higher supply that is then lowered via step down transformers to supply the various floors etc?
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  • 0
    This link may be of interest.


    Many buildings in London (well almost anywhere with load of more than a megawatt actually, and also  buildings with a lot less load than that in more spread out areas) have a dedicated  HV supply  and  transformer, usually in the basement in a built up area, or on an H pole outside rurally..

    However when the building is tall enough that voltage drop on the way up is also a problem, (and lift motors are not a small load either) then as the link above suggests, it gets quite a lot more complex than just one transformer, and there is HV distribution in the building too.

    The onset of the economics forcing a  move the HV nearer are at about 1 volt per metre phase to phase - so any run of more than about 400m for LV 3 phase, 11km for 11kV and about half the length of the UK for the supergrid.

    It is possible to have oversized cables or systems that compensate for line droop, but as a rule of thumb it is a pretty good start.

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  • 0
    This link may be of interest.


    Many buildings in London (well almost anywhere with load of more than a megawatt actually, and also  buildings with a lot less load than that in more spread out areas) have a dedicated  HV supply  and  transformer, usually in the basement in a built up area, or on an H pole outside rurally..

    However when the building is tall enough that voltage drop on the way up is also a problem, (and lift motors are not a small load either) then as the link above suggests, it gets quite a lot more complex than just one transformer, and there is HV distribution in the building too.

    The onset of the economics forcing a  move the HV nearer are at about 1 volt per metre phase to phase - so any run of more than about 400m for LV 3 phase, 11km for 11kV and about half the length of the UK for the supergrid.

    It is possible to have oversized cables or systems that compensate for line droop, but as a rule of thumb it is a pretty good start.

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