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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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    Many many main cutouts in houses have a main fuse made to B.S. 1361. The time current tables used to be printed in B.S. 7671. I have them in the red book. 17th edition.

    Regarding the B.S. 88 part 2 cartridge fuses, they were required to carry an overcurrent of 20 per cent for up to one hour before opening if rated at 63 Amps or less. For fuses rated above 63 Amps, they must be able to carry 20 per cent more than their rated current for four hours of more without opening.

    The latter are only required to operate within four hours if carrying 60 per cent more than their rated current.

     

    Curves' chat

     

    80A BS1361 Time Current Curve - IET Engineering Communities (theiet.org)

     

    Z.

Reply
  • 0

    Many many main cutouts in houses have a main fuse made to B.S. 1361. The time current tables used to be printed in B.S. 7671. I have them in the red book. 17th edition.

    Regarding the B.S. 88 part 2 cartridge fuses, they were required to carry an overcurrent of 20 per cent for up to one hour before opening if rated at 63 Amps or less. For fuses rated above 63 Amps, they must be able to carry 20 per cent more than their rated current for four hours of more without opening.

    The latter are only required to operate within four hours if carrying 60 per cent more than their rated current.

     

    Curves' chat

     

    80A BS1361 Time Current Curve - IET Engineering Communities (theiet.org)

     

    Z.

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