Interesting how it suggests fuses (proper ones, not rewireable) protect so much better than mechanical circuit breakers.
HRC (High Rupturing Capacity) Fuses have a lot higher capacity than circuit-breakers, as far as High Energy Faults go. Where as a Circuit-Breaker will interrupt "destructively" under Fault-Arc conditions, a Fuse package by design, will contain the entire arc within itself. With the use of fine Silica sand, it forms glass under the heated conditions. A lot better insulator. Anyone else got any comments on this document?.
Re: Link to- Electrical Safety Handbook#150545 06/24/0509:18 AM06/24/0509:18 AM
My understanding is that fuses have similar interrupting ratings as circuit breakers. If a overcurrent protective device needs to clear a arc fault, sometimes a circuit breaker will operate first if the arc fault current is below the current limiting range of the fuse. There are very few distribution systems that would benefit from a fuse rated at 300,000AIC, as the systems have fault duties much less than 200,000A. The referenced safety book has excellent information, but you need to consider the source is only a fuse manufacturer.
[This message has been edited by Ron (edited 06-24-2005).]
Re: Link to- Electrical Safety Handbook#150546 06/25/0505:42 AM06/25/0505:42 AM
The referenced safety book has excellent information, but you need to consider the source is only a fuse manufacturer.
So going by that, should we disregard any Safety stuff put out by manufacturers of related equipment?. In my opinion, there are a LOT of other things in this document, besides fusing. I've never used Bussmann products, nor am I likely to. I just thought that it was nice that they bought a thing like that out.