Something I would not normally recommend, is use a bit of welding wire (should know someone with a bit). Should last quite well, though if there is a fault you may find your in house cables will melt first. If you've still got your Grannies old aluminium whistling kettle in a cupboard somewhere, hang that on a bit string near the fuses. The excess heat from the fuseboard (an 8-way would be great) trying to blow should boil the kettle pretty quick. Though I must point out in all fairness the board might blow first. The downside of this would be sharing the shed with Oaf etc. As it may take sometime to make your house habitable again.