busbar help

[Darkwood]

How do you know your incoming DNO fuses are 100Amp?... remember just because the carrier says 100amp it doesn't mean the fuses inside are that rating.
I believe the DNO fuses are type III or IV anyway so fitting 100Amp BS88's -II would be fine, the fuses ratings between 60 - 100 amp are too close to give any real discrimination and at best only partial to a small percentage, as its a small supply by contrast discrimination will always be a problem between upstream and downstream devices. (regarding a short-circuit).

You will have overload discrimination as Tony says with 80amps as you may not have access to the DNO fuses to confirm they are Type III/IV

 

[Paul1985]

Thanks alot And some good points cheers.

 

[Flanders]

Busbars are 100a. I want to uprate it as iv got to change it as its rewirable fuse so whilst im at it may as well increase as in the future may want extra no point in paying out again for another fused isolator if i can fit one now With out to much trouble.

Dare a ask what is wrong with the rewirable fuses if not groke don't fix it

 

[Paul1985]

My work place is just trying to update things slowly.

 

[davesparks]

What make and model is the old switchfuse?

If it's MEM or BILL you can buy the bs88 fuseholder a which will fit in to the existing bases as a direct replacement.

 

[Knobhead]

That's handy to know. Cheers Dave.

 

[Darkwood]

What make and model is the old switchfuse?

If it's MEM or BILL you can buy the bs88 fuseholder a which will fit in to the existing bases as a direct replacement.

Even the new black holders replace the old cast rewirables best backwards compatability out there me thinks!

 

[davesparks]

I have found it is quicker and cheaper to get a new fuseholder with fuses than it is to try and track down 60/100 amp fuse wire these days

 

[Knobhead]

Always the practical one Dave.

I’ve got to admit I rarely came across rewirable fuses other than on the old DC systems.

 

[Rockingit]

I bought the last reel of 80A fuse wire that City's computers claimed to exist a while back, and no other wholesaler was listing either....certainly seems to be like hens teeth now.