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60A main Fuse, should I upgrade?

Former Community Member
Former Community Member

Supplier main Fuse is 60A and current consumer unit has 80A RCD (61008) as isolator with a notice saying 'Max load not to exceed 80A". Property is one storey with 5 rooms. Currently have 8 circuits, 2 lights with B10s, 2 ring finals with B32s, Cooker with B40, Shower with B40, Water Heater with B16 & Garage feed to a sub board with C40. Want to add a new 10.5kw shower so will need 50A protective device but not sure if should be approaching the DNO for an upgrade of the main fuse as running both showers together alone will draw a decent load

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    davezawadi (David Stone): 
    Not again! Diversity, time of use etc. Ignore it, if the fuse fails then the DNO may increase it to 80A, otherwise, big bills may be expected if you make a fuss.

    I am not sure that risking the fuse blowing is a good strategy because it would leave the household with no leccy.

    There is a risk that there will be no headroom left. It all depends on the household's routine. Will they be showering whilst the dinner is in the oven and the washing machine is running, for example? Mention of a garage hints at an EVCP at some stage.

    I would still advise the customer to approach the DNO with a carefully worded question. i.e. “What is the size of the main fuse; and what would be the cost of upgrading it if it turns out to be advisable?”

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  • 0

    davezawadi (David Stone): 
    Not again! Diversity, time of use etc. Ignore it, if the fuse fails then the DNO may increase it to 80A, otherwise, big bills may be expected if you make a fuss.

    I am not sure that risking the fuse blowing is a good strategy because it would leave the household with no leccy.

    There is a risk that there will be no headroom left. It all depends on the household's routine. Will they be showering whilst the dinner is in the oven and the washing machine is running, for example? Mention of a garage hints at an EVCP at some stage.

    I would still advise the customer to approach the DNO with a carefully worded question. i.e. “What is the size of the main fuse; and what would be the cost of upgrading it if it turns out to be advisable?”

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