busbar help

[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.

 

[Bobster]

Think I've got a roll of 80A fuse wire in my garage somewhere.

 

[davesparks]

Always the practical one Dave.

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

Well you have to be practical once you leave the warm and fluffy domestic world!

Fix it within 24hrs or loose the client!

 

[Knobhead]

24Hrs? Dear god that would cost £1000’s per minute, I’d be hung off one off the nearest OH crane.

Even though we were still using switchgear from the 30/40’s all used HRC fuses. Definitely not to BS88.
For some reason the 220V DC system never used them, fortunately the 440/660V systems did. A rewireable fuse going at 220V is frightening enough.

We did have some rewireable 3.3KV oil filled fuses for capacitor banks. As far as I know we never had one blow. I wouldn’t like to be around if one did.

 

[davesparks]

24Hrs? Dear god that would cost £1000’s per minute, I’d be hung off one off the nearest OH crane.

Even though we were still using switchgear from the 30/40’s all used HRC fuses. Definitely not to BS88.
For some reason the 220V DC system never used them, fortunately the 440/660V systems did. A rewireable fuse going at 220V is frightening enough.

We did have some rewireable 3.3KV oil filled fuses for capacitor banks. As far as I know we never had one blow. I wouldn’t like to be around if one did.

In this instance I'm thinking of a local care home, different failures carry different levels of urgency.
In this case the fault affected the residents and had to be fixed within 24hours or else the CQC would have to be informed (care quality commission)
Other faults have to be fixed quicker, and other stuff just gets put in the book to be dealt with next time I visit.

Other places the downtime is measured in seconds, like the inflatable stage roof slowly collapsing as 5000 festival goers watch and the stage manager tried to evacuate the stage as the band try to carry on playing.
(The 3 minutes it took to get the site live again but it felt like forever)

 

[Engineer54]

Definitely not to BS88.

Why's that, BS 88 ''ARE'' HRC fuses with a breaking capacity range up to 120KA and above. Come in all shapes and sizes from circular to square.... Types may change but still conform to BS 88.