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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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  • Former Community Member
    0 Former Community Member

    Thanks Andy. Referring back to table 3A3(b) though isn't the data essentially saying that a 63A fuse will require roughly 100A of load for an hour before it begins to operate or am I misunderstanding the chart? Can't imagine a situation where both showers would be used for such a period at the same time so to my original query the existing main cutout fuse (if BS 1361 or BS 88-3) should be capable of dealing with the load should both showers be operated at the same time for a short period (say 10-15mins) ?

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  • Former Community Member
    0 Former Community Member

    Thanks Andy. Referring back to table 3A3(b) though isn't the data essentially saying that a 63A fuse will require roughly 100A of load for an hour before it begins to operate or am I misunderstanding the chart? Can't imagine a situation where both showers would be used for such a period at the same time so to my original query the existing main cutout fuse (if BS 1361 or BS 88-3) should be capable of dealing with the load should both showers be operated at the same time for a short period (say 10-15mins) ?

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