It depends on where the wire is being used, but for the power supply for an ordinary domestic audio amplifier, wire of 0.75 mmsq is adequate, and need to be protected by a 5-amp fuse.
Metal with a lower melting point is preferred for fuse wire to reduce the risk of fire.
A fuse should be connected in the live wire, before reaching the appliance.
The wire that connects the power source to the rest of the circuit should contain the fuse. This is typically the wire that leads directly from the positive terminal of the battery or power source. Placing the fuse in this wire helps protect the circuit in case of a short circuit or overload.
There is an oversized or malfunctioning fuse in the fuse box. The fuse should blow before the wire is damaged.
There should be a radio fuse in the fusebox that you will want to tie your radio wire into.
Same side as the fuse.
The fuse needs a low melting point and reletivelyhigh resistance so that it melts at the proper current
In ordinary circumstances, a red wire is a secondary hot wire in an AC circuit, or the positive power leg in a DC circuit. Red should not be used as a neutral. If it is used for something other than a hot wire it must be labeled on the wire at all connection points- and would STILL be a bad idea.
No the subwoofer itself does not contain a fuse. The Amplifier Connected to the sub should consist of a fuse or the power wire leading to the amp should contain one.
Not if it is secured and tightened properly and has the correct size breaker installed for the wire size used.
Fuse wire is usually made with metal that has a low melting point, e.g. tin, to lessen the risk of fire.