Re: Fuse blowing every couple of months

It is happening while rig is on for several days. The fuse is old style one time use.

Have you checked the wiring for faulty connections and ratings? (ex. 12gauge+ wires for 20A) The most obvious signs are thin-looking wires in the circuit or bunch of "rat-tail" connections; if there's a problem, the wire or the connections will heat up and will "pop" your fuse.
If you're not qualified to do so, call for a professional electrician to do the job.

There's no other reasons for this other than faulty wiring since it's happening too often to be caused by a bad fuse, otherwise, frequent power outage.

I am not expert in it. However how can a lower quality wire burn the fuse. Every time I noticed that fuse was burned badly. Why the "wire or the connection will heat up" will cause "pop the fuse". Can you please explain?
Thanks a lot for your help.

When the copper wire heats up (maybe you have it), the resistance increases and the current decreases. Thus, heating the wires can not lead to a blown fuse. If the fuse heats up with these wires, or the fuse socket has poor contact (which causes heating at high current), and the current is close to tripping, then the fuse may trip.
You should be powered by quality power wires, to use a good fuse socket and the fuse 1.5-2 times of load. If the load is 15 A, the fuse is at least 22.5 A.