Question about NAD C270 2-Channel Amplifier

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Question about a T.13 AL 250v fuse

There are two of these fuses in my electric piano.  they have a wire with a little knot in the middle. Is this the way this fuse should look?  thanks

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The short answer is yes. This is normal for this type of fuse.


Posted on May 26, 2009


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Hi Giovanni - I'm an electrician and can help you with your question.

Fuses are designed to fit specific holders so that they aren't accidentally installed into the wrong holder. This is accomplished by manufacturing fuses that rely on differences in length, diameter, blades, notches, tabs, determined by the voltage and range of current in amps that the circuit needs. We would never want to install a 100 amp fuse in a holder for a circuit designed to be protected by a 15 amp fuse. As a result, you can not physically install a 100 amp fuse in a fuse holder designed to hold a 15 amp fuse and vice-versa.

The notches like the one on the 250V 40A fuse below do the same thing as described above. The fuse should require only enough force to seat into the spring loaded clamps. Larger fuses require more pressure than smaller sizes. Sometimes, the fuse will fit either way - but this is not always the case. I usually install them so that the label is right-side up - if it doesn't like that orientation, simply flip the fuse. The electrical rating does not change - regardless of position.

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It is really ill advise to solder a wire in the place of a fuse. You are just asking for it.

The way I did it is I went to my local Radio Shack and got a small fuse holder with red leads and 1.5 Amp fuses. I soldered the fuse holder in place with the new fuse. And now I don't have to deal with any more solder. Just twist the fuse holder, take out the burnt out fuse and replace it with a new one. And wahlah. I'm back in business again.

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