Fuses fuses fuses


Ok, this is about fuses

1- a standard Bussman fuse is UL approved. Are any "high end" fuses UL approved?

2- do any component manufacturers supply their gear with any of the usual suspects of high end fuses as opposed to a standard Bussman?

3- let's say fuses do make a difference. Given incoming power is AC, why could fuses be directional? 

Not meaning to light any fires here- 

thanks in advance 
128x128zavato
Oh, your are going to light fires, especially with that avatar ;)

Re: directional fuses, I recall Ralph at Atma-Sphere mentioning something, but I forgot the details. Though I think he said there was something to it. (If I am wrong Ralph, sorry).
B
Im using all Synergistic Black Quantum fuses they sound wonderful why would you want to use a 50 cent fuse on a 10k component not me.Imnot going to waste time trying them in different directions as they sound wonderful the way i have them in now.Using them on my preamp,phono stage,cd player etc.Good luck though.
@zavato
I can’t answer your questions. But I hope you get to hear the Black Fuses in your transport one day. I would love to hear your feedback. It really has made digital so much better...not a subtle improvement.