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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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    Trevor E: 
     

    Sorry Mike, i'm relatively new to this and you lost me there. Are you saying that if it is BS 1361 rated at 60A it will open quicker if 100A being pulled through it?

    Yes Trevor, the more current that flows through a fuse the quicker it will heat up. If that current is excessive it will cause the fuse element inside to melt. The H.R.C. fuses contain a silver strip of metal that is sized to melt and open the circuit with a certain range of currents above its rated value. The 60 Amp fuse will carry 60 Amps all day forever. But if say, 200 Amps flows through it, it will open  in about perhaps 60 seconds. 300 Amps will open it even faster, and 500 Amps almost instantly.

     

    Z.

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  • 0

    Trevor E: 
     

    Sorry Mike, i'm relatively new to this and you lost me there. Are you saying that if it is BS 1361 rated at 60A it will open quicker if 100A being pulled through it?

    Yes Trevor, the more current that flows through a fuse the quicker it will heat up. If that current is excessive it will cause the fuse element inside to melt. The H.R.C. fuses contain a silver strip of metal that is sized to melt and open the circuit with a certain range of currents above its rated value. The 60 Amp fuse will carry 60 Amps all day forever. But if say, 200 Amps flows through it, it will open  in about perhaps 60 seconds. 300 Amps will open it even faster, and 500 Amps almost instantly.

     

    Z.

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