Two fuse wires of same length are rated 15A and 5A. Which of the two will be thicker and why?
The fuse wire rated for 15A shall be thicker. It is meant for power and heating circuit where normal operating current is higher than fan & lighting circuit. The fuse should not blow during normal circuit operation causing unnecessary disruption of service. Therefore, a bigger cross section of the wire is needed to sustain normal flow of current.