all the downstairs appliances went out yesterday. Went to fuseboard but no fuses had tripped, ie had not switched to off as before. By testing each fuse discovered the one that had tripped. From running an extension cable from the garage then plugged each appliance into that until we discovered that the washing machine was not working. Replaced fuse in washing machine, put fuse in switchboard back to on and everything hunky dory. Until six hours later when everything went out again. This time it was the dishwasher that has blown. Is this too much of a coincidence ? Why hasn't the fuse in the fusebox tripped (switched off). What should I do next ? Is the fuse in the fuse box faulty ? Any assistance greatly apprecaited.
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yes, a modern consumer unit with MCB which normally trip and are resetable. I think it contains an RCD but not 100% on that.
It doesn't sound like this has tripped.
Two plug fuses going in such a short space of time is odd but not unknown. Assuming they were both 13A they may blow before the relevant MCB trips, but it's not guaranteed. Fuses, though much more accurate nowdays are not as sensitive as MCB's. In short circuit conditions the MCB will trip before a 13A fuse has time to blow.
If everything is working, just monitor the situation. But make sure both plugs contain the manufacturers recommended rated fuse (probably 13A) and check the relevant MCB is rated at 32A assuming the appliances are fed from the kitchen ring circuit. All circuits in a consumer unit should be identified clearly. If they are not, spend some time to do so. It's for your own benefit.
What I don't understand is that although the washing machine fuse went the MCB didn't trip (cut off) although all the other appliances on that circuit also went off.
Without seeing the problem for myself, i am working somewhat in the dark (no pun intended) Some older MCB's have push button reset and more modern ones have a small lever resets. I wouldn't be surprised if a button type did what you describe, but would be surprised if a lever type did it. Nonetheless if you're sure about it, change it.