Just on the subject of needing a general fuse, I do know of rules for some
of the phone line related items I've been asked to design. 1 of the rules
specified that if ever something should short out in the design, say, the
primary bridge diodes, the device needs to either blow to a short, of, an
open.
Now, I know that no matter what, there isn't enough current in the phone
lines to cause a fire unless there is a lightning strike in the right place
at the right time, this is where I would require a circuit to blow open.
For this device, the X10 device would be an acceptible saving with
acceptable wide blow range since I only need to blow during a such a
catastrophe.
_________
Brian G.
----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, November 08, 2005 9:46 AM
Subject: RE: [PEDA] How do I design a fusible link into a PCB?
If they use a wire that has consistent physical characteristics, in an
environment with consistent physical characteristics, consistently
bonded to the substrate, then, yes, within reason, though I'm really not
sure what the fusible link in the X10 module is actually meant to
accomplish, nor to what degree they have tested the fusible link.
One need look no further than a catalog of fuses or the NEC to see that
fuses are somewhat imprecise. To make one's own perform as well as those
that are engineered for the purpose is in my opinion either child's play
or a waste of time. Except for rough-shod work, I'd vote for the latter.
At ~$100-200/hr, $0.15 gets gobbled up in a couple of breaths.
regards,
aj
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Dennis Saputelli
Sent: Monday, November 07, 2005 5:11 PM
To: Protel EDA Discussion List
Subject: Re: [PEDA] How do I design a fusible link into a PCB?
but the thin wire soldered into pads which i suggested should
be repeatable and consistent, no ?
ds
_______________________________________________________________________
Integrated Controls, Inc. Tel: 415-647-0480 EXT 107
2851 21st Street Fax: 415-647-3003
San Francisco, CA 94110 www.integratedcontrolsinc.com
[EMAIL PROTECTED] wrote:
Though it's conceptually a simple issue, the variations in
manufacturing can lead to uncertainty in the operation of such a
trace. Simply calculating track width (of an ideal copper
clad board)
for 1A continuous is insufficient for the intended use and a
potential
liability...
...I could swear you were around for the lengthy discussions
we had on
this subject years ago.
aj
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Butcher, Bob
Sent: Friday, November 04, 2005 12:30 PM
To: [email protected]
Subject: [PEDA] How do I design a fusible link into a PCB?
I want to add a narrow circuit trace to a PCB design to act
as a fuse.
It should operate with 1 Amp of current continuously and open if the
current exceeds a higher value (2-5 Amp). This project is very cost
sensitive and a 15 cent fuse may be too much. I have the guidelines
for conductor heating vs cross section, and it appears the conductor
would need to be less than 10 mils wide on a 1 Oz copper board. Does
anyone have experience with this subject?
Bob Butcher
[EMAIL PROTECTED]
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