Fuse Rating for Oven

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robfish

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#2076393 20-Aug-2018 18:15

But the whole point was to stop it tripping out, which it shouldn't do.

Well if you "do the maths" as I suggested earlier you will see that it shoud trip.

Rob

ADKM

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#2076400 20-Aug-2018 18:26

But Rob, we don't *want* it to trip. By shouldn't I meant it should be setup so it doesn't happen.

Isn't household oven wiring normally 30 amps for the 1970s? If it's proved we have the right gauge /size to handle 30 amps I could try a 25A fuse. Incidentally it wasn't being run with everything on Full. Hot plates were on simmer and the main oven about 200 degrees.

richms

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#2076404 20-Aug-2018 18:31

Uprating a breaker which is only suspected of being swapped out for a lower rating one is just asking for trouble.

This is as logical as those people that go jamming random metal things into fuses because they keep blowing.

Richard rich.ms

ADKM

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#2076408 20-Aug-2018 18:39

Not quite Rich, talking about going from 20A circuit breaker to 20A fuse wire to start with. Mainly to see if it makes any difference, proving the CB is tripping incorrectly.

Aredwood

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#2076512 20-Aug-2018 21:06

ADKM:
> Can't you just plug the GF grill into a different power point?

Could do, with an extension cord. But the whole point was to stop it tripping out, which it shouldn't do. (It isn't 2 phase nor is that wired in here.)

Someone said to ring F&P so I did. The girl there wasn't very convincing and said the current rating was 52A. I don't think that helps.

If I can get a holder, I'll try some 20A fuse wire and see what happens. That saves $30 or so on a circuit breaker that may be no different to what's here now.

Don't use 20A fuse wire. As most fuses are only regarded as coarse protection. While most circuit breakers are regarded as close protection. The difference being the ratio between rated current, and the current at which the fuse will blow / breaker trips in a given time.

For example, a cable that can be safely protected by a 20A breaker. Would likely only be safe with a 15A fuse.

A 20A wire fuse would probably take a good hour to blow at 40A.

Please, please, Just get an electrician in to check and advise you on the correct rating for the circuit.

The electrical codes have lots of different sections that have to all be consulted to work out the correct current rating for a fuse or breaker on a given cable. This can't be calculated without a sparky visiting your house to check your installation.

Note also that there is no actual requirement to run a 32A circuit to a stove. So 20A could easily be the correct current rating for your circuit.

robfish

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#2076535 20-Aug-2018 22:38

Hot plates were on simmer and the main oven about 200 degrees.

"Simmerstats" and thermostats do not limit the current they just switch it on and off.
Trust me, it is entirely understandable that a range and a George Forman Grill will trip a 20A breaker. Yes a fuse will take longer to blow but it will also heat up and tend to overheat the assembly, introducing another fire risk.
That cable looks at least 4mm (probably even 7/.036) which can legally and safely be protected by a 32A breaker and probably solving your problem.

Rob

sparkz25

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#2076584 21-Aug-2018 06:40

what circuit breaker are you using???? the plug in type push button re settable? if so bin it as that will be your problem!!!! those things have a tendency to fail and be a pain like that, whats the distance form the switch board? that picture of the cable looks to be a 4mm or a 6mm and will be fin on a 25A mcb.

and you shouldnt be using fuse wire what soever now days as the fusing factor is far to high, a HRC fuse would be better than fuse wire.

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MadEngineer

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#2078058 23-Aug-2018 16:11

Yeah it does look like 4mm/6mm but some weird chinese rubbish due to the larger than usual earth. Typically that size cable has a 2.5mm earth.

Do you leave those fuse holders emtpy? It's a good way to kill someone. Albeit painfully.

You're not on Atlantis anymore, Duncan Idaho.

gregmcc

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#2078074 23-Aug-2018 17:34

MadEngineer:

Yeah it does look like 4mm/6mm but some weird chinese rubbish due to the larger than usual earth. Typically that size cable has a 2.5mm earth.

It's just older cable, it was the 90's sometime that 6mm2 cables were allowed the smaller earths

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