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#150542 - 06/18/05 12:52 AM Link to- Electrical Safety Handbook
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
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!.
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Let's face it, these days if you're not young, you're old - Red Green grin

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Arc Flash PPE Clothing, LOTO & Insulated Tools
#150543 - 06/18/05 05:04 PM Re: Link to- Electrical Safety Handbook
gideonr Offline
Member

Registered: 12/18/04
Posts: 152
Loc: Edinburgh, Scotland, UK
Interesting how it suggests fuses (proper ones, not rewireable) protect so much better than mechanical circuit breakers.

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#150544 - 06/24/05 12:29 AM Re: Link to- Electrical Safety Handbook
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Gideon,
 Quote:
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?.
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#150545 - 06/24/05 07:18 AM Re: Link to- Electrical Safety Handbook
Ron Offline
Member

Registered: 03/13/02
Posts: 577
Loc: White Plains, NY
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).]
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#150546 - 06/25/05 03:42 AM Re: Link to- Electrical Safety Handbook
Trumpy Offline

Member

Registered: 07/05/02
Posts: 8540
Loc: SI,New Zealand
Ron,
 Quote:
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.
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