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Link to- Electrical Safety Handbook #150542
06/18/05 03:52 AM
06/18/05 03:52 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,260
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!.

Arc Flash PPE Clothing, LOTO & Insulated Tools
Re: Link to- Electrical Safety Handbook #150543
06/18/05 08:04 PM
06/18/05 08:04 PM
G
gideonr  Offline
Member
Joined: Dec 2004
Posts: 161
Edinburgh, Scotland, UK
Interesting how it suggests fuses (proper ones, not rewireable) protect so much better than mechanical circuit breakers.

Re: Link to- Electrical Safety Handbook #150544
06/24/05 03:29 AM
06/24/05 03:29 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,260
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?.

Re: Link to- Electrical Safety Handbook #150545
06/24/05 10:18 AM
06/24/05 10:18 AM
R
Ron  Offline
Member
Joined: Mar 2002
Posts: 582
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).]


Ron
Re: Link to- Electrical Safety Handbook #150546
06/25/05 06:42 AM
06/25/05 06:42 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,260
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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