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Set a Volt-Ohm meter to Ohms and put the two leads from meter across the fuse. One on each end where the metal is located. The meter should read zero ohms if the fuse is NOT blown.

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Q: How do you measure the resistance of a 30-amp cartridge fuse in ohms?
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Would it be useful to insert two fuses in a circuit instead of one?

If the circuit develops a fault which causes a dangerous over-current condition - which would have caused the original piece of fuse wire to melt and thus break the circuit before anything catches on fire - then doing the kind of vandalism to a fuse carrier, as is possibly being described by this question, is a negligent and highly dangerous act.For a re-wireable fuse, using two pieces of fuse wire instead of one - or using a paper clip, a nail or any other piece of metal which is not the correct fuse wire - is:highly dangerous as it is a major cause of house-firescould mean that your house would no longer be covered for fire damagean illegal act in some countries which, if proven, could result in criminal prosecution followed by a heavy fine and/or imprisonment.To summarize:If this question is asking if it would be useful, in a re-wireable fuse carrier, to replace a single length of fuse wire by two lengths of fuse wire, wired in parallel, the answer is NO because one length of fuse wire should only ever be replaced by ONE length of the correct amperage rating, which means it must be fuse wire of an identical gauge and material as the original.If this question is asking if it would be useful to replace a single cartridge fuse by two similar cartridge fuses connected in parallel, the answer is NO because the extra fuse would not be able to offer the same protection to the circuit as the original single fuse was intended to do. A single cartridge fuse should only ever be replaced by ONE cartridge fuse of the same identical size and amperage rating.If this question is asking if it would be useful to replace a single cartridge fuse by two similar cartridge fuses connected in series, the answer is NO. The additional fuse would serve no useful purpose. A single cartridge fuse should only ever be replaced by ONE cartridge fuse of the same identical size and amperage rating.As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.Before you do any work yourself,on electrical circuits, equipment or appliances,always use a test meter to ensure the circuit is, in fact, de-energized.IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOBSAFELY AND COMPETENTLYREFER THIS WORK TO QUALIFIED PROFESSIONALS.


What are the advantages of a HBC fuse over a cartridge fuse?

HBC (High Breaking Capacity, European term) and HRC (High Rupturing Capacity, North American term) fuses have the ability to break high fault currents. This is done by having silica sand in the fuse that the fuse elements travel through. On high fault current that sand will melt and turn to glass. This breaks the current flow immediatelyA cartridge fuse maximum current breaking capacity is very much lower than HRC, HBC because there is nothing in the fuse body except the fuse elements.


What is specific resistance and melting point of fuse?

low resistivity and low melting point.


A fuse in a circuit is meant to burn out first if there is a short circuit. Should a fuse have a higher or lower resistance than the wire in the rest of the circuit?

The way current (series) fuses are designed and used, they are meant to overheat and blow and cause an open circuit if the current flow through these goes above the rated value. The resistance value typically is slightly higher than the wiring and adds marginal value of series resistance to the overall circuitry. The material characteristics of fuse ensure that at regular nominal current flow the fuse does not overheat, but when larger than expected current flows it overheats, melts (or gives very high resistance/open in a resettable fuse)and causes circuit to open.


Give one advantage of using a circuit breaker rather than a wire or cartridge fuse?

An electrical breaker is dual function an electrical fuse just has one purpose.