ECN Forum Forums Safety Discussion and News Occupational Safety Discussion Link to- Electrical Safety Handbook

Guys,
Have a look at this.
It's right here .
Bill provided a link that you will see in his post.
For those of you that are interested in Workplace safety, get this!.

Interesting how it suggests fuses (proper ones, not rewireable) protect so much better than mechanical circuit breakers.

Gideon,
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?.

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).]

Ron,

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.