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Old 27.04.2015, 16:20
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Turning off power to a circuit with ceramic fuse

Hi, I'm new to Swiss electrical boxes. I'd like to temporarily turn off power to a particular circuit -- but within the electrical box, the circuit in question is connected via a round ceramic fuse and not a circuit breaker like I'm used to. Do I simply unscrew the fuse? Any safety issues to be aware of, which don't apply with circuit breakers?

Thanks.
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  #2  
Old 27.04.2015, 16:22
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Re: Turning off power to a circuit with ceramic fuse

Just unscrew it.
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Old 27.04.2015, 16:24
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Re: Turning off power to a circuit with ceramic fuse

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Just unscrew it while wearing rubber boots, standing in a container of water and recanting in Romantsch "To the God of thunder and lightning spare my life for one more day".
Think that covers it.

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Old 27.04.2015, 16:46
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Re: Turning off power to a circuit with ceramic fuse

just to state the obvious, but take it all the way out, not just a couple of turns and leave it in

Also, if its the 3 phase line you'll need to take out all 3 otherwise it'll still be live.
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Old 27.04.2015, 17:07
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Re: Turning off power to a circuit with ceramic fuse

Screw it back in tight, otherwise after a while you'll experience the 1st of Aug fireworks at your own place I am not joking
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Old 27.04.2015, 17:28
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Re: Turning off power to a circuit with ceramic fuse

If you're asking this question, consider an electrician
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Old 27.04.2015, 18:16
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Re: Turning off power to a circuit with ceramic fuse

Thanks for the replies - "just unscrew it" is what I was hoping to hear.
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Old 27.04.2015, 23:02
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Re: Turning off power to a circuit with ceramic fuse

If it has in the middle un uncovered metal nail--head don't touch it! And keep fingers away from the inside of the socket!
If you have such an old circuit breaker than likely there is no residual current protection - so to be sure unscrew all of them, and do not mix them as they have differenct maximum current rating.
And then check with a probe or whatever it is called in English before touching any wires; the last test is you touch with the outer side of your palm, and NEVER do anything alone, and other person knows they need to kick you out of a live wire w/o touching you.
If you never did it, then don't!
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Old 28.04.2015, 11:56
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Re: Turning off power to a circuit with ceramic fuse

Maybe it's obvious, but take the fuse out of the holder and screw the holder back in to cover any exposed parts!

Especially if it's not a five minute job.
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Old 28.04.2015, 12:04
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Re: Turning off power to a circuit with ceramic fuse

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do not mix them as they have differenct maximum current rating.
If they have different current ratings, they will also have different physical sizes and thus cannot me mixed.

Tom
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Old 28.04.2015, 12:14
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Re: Turning off power to a circuit with ceramic fuse

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If they have different current ratings, they will also have different physical sizes and thus cannot me mixed.

Tom
not always


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Old 28.04.2015, 12:15
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Re: Turning off power to a circuit with ceramic fuse

Holy c**p !

I reckon the fuses are pointless - the wires will blow first
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Old 28.04.2015, 12:16
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Re: Turning off power to a circuit with ceramic fuse

feck, walk away from that one, it has bad news written all over it lol
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Old 28.04.2015, 12:29
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Re: Turning off power to a circuit with ceramic fuse

Achtung Stark Strom!!!
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Old 28.04.2015, 12:31
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Re: Turning off power to a circuit with ceramic fuse

and I always double check with a volt meter and /or my live wire detector before I touch anything, even on pretty new places I've seen some real botch jobs here
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Old 28.04.2015, 12:33
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Re: Turning off power to a circuit with ceramic fuse

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Maybe it's obvious, but take the fuse out of the holder and screw the holder back in to cover any exposed parts!...
And put the fuse in your pocket, so no sneaky beggar "helpfully" puts it back in.
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Old 28.04.2015, 12:35
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Re: Turning off power to a circuit with ceramic fuse

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not always


Reminds me of my first job.

We had this test station for high power semiconductors that had been around since donkey's years and people had added to and modified it over the years but nobody actually had a reliable or up to date schematic so my first assignment was to draw one. I removed the covers and the wiring looked more or less like this. Everything was dirty. Nothing was labelled and there were cables all over the place, many of them not connected to anything, or worse still, connected only at one end. This tester could go up to 6000V DC mind you, so a bit more dangerous than mains.

I duly took a sheet of paper and started following the wires and sketching the schematic. The more I progressed and the more panels I removed, the worse the mess that greeted me. At one point I sat down and just laughed and right then my boss came in and asked what's so funny. I tried to explain but he was not amused.
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Old 28.04.2015, 12:44
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Re: Turning off power to a circuit with ceramic fuse

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not always
Yes, always.

Look at the fuse itself, NOT the cover.

Different rated fuses have different sized tips, though the body (and thus the cover) are the same size.

Higher rated current has a larger tip diameter, and thus cannot be inserted in one rated for less (however a lower rated fuse can be inserted in a receptacle for a larger one).

Tom
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Old 28.04.2015, 12:48
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Re: Turning off power to a circuit with ceramic fuse

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I duly took a sheet of paper and started following the wires and sketching the schematic. The more I progressed and the more panels I removed, the worse the mess that greeted me. At one point I sat down and just laughed and right then my boss came in and asked what's so funny. I tried to explain but he was not amused.

I understand perfectly. Been there, done that. Sometimes you have a choice to either laugh or cry at a situation. I've found that crying doesn't help. At least laughing drops your blood pressure.....
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Old 28.04.2015, 13:44
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Re: Turning off power to a circuit with ceramic fuse

Real men don't use circuit breakers or cartridge type fuses, they wire their own, multiplying up the strands of fuse wire as required to achieve the the appropriate amperage :
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