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Thanks so much for this information.
I can't believe that I might actually be looking forward to my next short
circuit! 8>)
Everyone, have a great day and thanks for all the help!
Moose
From: JohnT Blair <jblair1948@cox.net>
To: Shop-talk@autox.team.net
Date: 01/12/2024 10:59 AM
Subject: Re: [Shop-talk] Fuses
Sent by: "Shop-talk" <shop-talk-bounces@autox.team.net>
On 01/12/2024 6:21 AM EST Moose wrote:
>This is brilliant (figuratively AND literally) 8>) But is this safe?
Couldn't it melt wires if there
>is a short?
Moose,
Yes it's safe if you do it correctly. You want to use a good socket, if
it's not plastic wrap it with electrical tape. We use this for finding a
short in a piece of electronic equipment. Put a 60W light bulb in a box
in series with the outlet that you plug the equipment into. This will
limit the current to 1/2 amp.
I also suggest (someone else mentioned this) that you make some sort of
adapter to plug into the fuse socket. For the old
glass cylindrical fuses, solder a piece of insulated wire on each end so
you can connect clip leads to the wire to connect to the light bulb or to
the circuit breaker. For the spade type, take a couple of spades and
solder insulated wire to the spades.
The secret is to use something to use limit the current to less that the
original fuse, ie. if the circuit that has the problem has a 10A fuse,
limit the current to 5A. How? Use ohms and Watts law,
Ohms law: E = I * R E - Voltage, I - Current, R - Resistance.
Watts law: P = I * E P - power (watts)
So for a 10 A circuit in a 12 V system, R = E / I, you'll need
R = 12V / 10A = about 1 ohm of resistance.
You also need to account for the power: P = I * E or
P = 10A * 12V or 120 W.
This is why you use light bulbs. But they should be closely matched to
the power used by the circuit being worked on.
If you go too low of wattage, the light bulb will burn out, If you go to
high, then the light bulb won't limit the current enough to protect the
circuit.
>This is a really great idea I never hear of, so thanks for sharing!
Yes, I use it for electronics. But you need incandescent bulbs.
https://www.instructables.com/Light-Bulb-Current-Limiter/
For automotive I prefer to have different size circuit breakers, 1, 5, 10,
20, 30A breakers and clip leads.
JohnT,
John T. Blair WA4OHZ email: jblair1948@cox.net
Va. Beach, Va Phone: (757) 495-8229
65 Morgan 4/4 Series V (B1106) 75 Bricklin SV1 (#0887) 48 TR1800 48
#4 Midget
65 & 77 Spitfire 71 Saab Sonett III 65 Rambler Classic 65 Volvo
P1800
Morgan: http://autox.team.net/morgan/
Bricklin: http://www.bricklin.org
If you can read this - Thank a teacher!
If you are reading it in English - Thank a Vet!!
>From Dennis Prager - The American Trilogy:
e pluribus Unum, "from many, one."
In God We Trust
Liberty - the power of choosing, thinking, and acting for
oneself; freedom from control or restriction
_______________________________________________
Shop-talk@autox.team.net
Archive: http://www.team.net/pipermail/shop-talk
http://autox.team.net/archive
http://autox.team.net/mailman/options/shop-talk/eric@megageek.com
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<span style=" font-size:10pt;font-family:sans-serif">Thanks so much for
this information.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">I can't believe
that I might actually be looking forward to my next short circuit!
8>)</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Everyone, have
a great day and thanks for all the help!</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Moose</span>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style="
font-size:9pt;font-family:sans-serif">JohnT
Blair <jblair1948@cox.net></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style="
font-size:9pt;font-family:sans-serif">Shop-talk@autox.team.net</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style="
font-size:9pt;font-family:sans-serif">01/12/2024
10:59 AM</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style="
font-size:9pt;font-family:sans-serif">Re:
[Shop-talk] Fuses</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style="
font-size:9pt;font-family:sans-serif">"Shop-talk"
<shop-talk-bounces@autox.team.net></span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:12pt"> On 01/12/2024 6:21 AM EST Moose
wrote: </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">></span><span style="
font-size:12pt;font-family:sans-serif">This
is brilliant (figuratively AND literally) 8>)</span><span style="
font-size:12pt">
</span><span style=" font-size:12pt;font-family:sans-serif">But
is this safe? Couldn't it melt wires if there </span>
<br><span style=" font-size:12pt;font-family:sans-serif">>is a
short?</span><span style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">Moose, </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">Yes it's safe if you do it correctly.
You want to use a good socket, if it's not plastic wrap it with electrical
tape. We use this for finding a short in a piece of electronic equipment.
Put a 60W light bulb in a box in series with the outlet that you
plug the equipment into. This will limit the current to 1/2 amp.
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">I also suggest (someone else mentioned
this) that you make some sort of adapter to plug into the fuse socket.
For the old </span>
<br><span style=" font-size:12pt">glass cylindrical fuses, solder a piece
of insulated wire on each end so you can connect clip leads to the wire
to connect to the light bulb or to the circuit breaker. For the spade
type, take a couple of spades and solder insulated wire to the spades.
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">The secret is to use something to use
limit the current to less that the original fuse, ie. if the circuit that
has the problem has a 10A fuse, limit the current to 5A. How? Use
ohms and Watts law, </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">Ohms law: E = I * R
E - Voltage, I - Current, R - Resistance. </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">Watts law: P = I * E
P - power (watts) </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">So for a 10 A circuit in a 12 V system,
R = E / I, you'll need </span>
<br><span style=" font-size:12pt">R = 12V / 10A = about 1 ohm of resistance.
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">You also need to account for the power:
P = I * E or </span>
<br><span style=" font-size:12pt">P = 10A * 12V or 120 W. </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">This is why you use light bulbs. But
they should be closely matched to the power used by the circuit being worked
on. </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">If you go too low of wattage, the light
bulb will burn out, If you go to high, then the light bulb won't
limit the current enough to protect the circuit. </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">></span><span style="
font-size:12pt;font-family:sans-serif">This
is a really great idea I never hear of, so thanks for sharing!</span><span
style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt"><br>
Yes, I use it for electronics. But you need incandescent bulbs. </span>
<br><span style=" font-size:12pt"> </span>
<br><a href="https://www.instructables.com/Light-Bulb-Current-Limiter/";><span
style="
font-size:12pt;color:blue"><u>https://www.instructables.com/Light-Bulb-Current-Limiter/</u></span></a><span
style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">For automotive I prefer to have different
size circuit breakers, 1, 5, 10, 20, 30A breakers and clip leads. </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">JohnT,<br>
</span><span style=" font-size:12pt;font-family:Tahoma"><br>
John T. Blair WA4OHZ email: jblair1948@cox.net</span>
<br><span style=" font-size:12pt">Va. Beach, Va
Phone: (757) 495-8229 </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">65 Morgan 4/4 Series V (B1106)
75 Bricklin SV1 (#0887) 48 TR1800 48 #4 Midget
</span>
<br><span style=" font-size:12pt">65 & 77 Spitfire 71 Saab Sonett
III 65 Rambler Classic 65 Volvo P1800 </span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:12pt">Morgan: </span><a
href=http://autox.team.net/morgan/><span style="
font-size:12pt;color:blue"><u>http://autox.team.net/morgan/</u></span></a><span
style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt">Bricklin: </span><a
href=http://www.bricklin.org/><span style="
font-size:12pt;color:blue"><u>http://www.bricklin.org</u></span></a><span
style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt">If you can read this
- Thank a teacher! </span><span style="
font-size:12pt;font-family:Tahoma"><br>
If you are reading it in English - Thank a Vet!!</span>
<br><span style=" font-size:12pt;font-family:Tahoma">From Dennis Prager
- The American Trilogy:</span><span style=" font-size:12pt"> </span><span
style=" font-size:12pt;font-family:Tahoma"><br>
e pluribus Unum, "from many, one."</span><span style="
font-size:12pt">
</span><span style=" font-size:12pt;font-family:Tahoma"><br>
In God We Trust</span><span style=" font-size:12pt">
</span><span style=" font-size:12pt;font-family:Tahoma"><br>
Liberty - the power of choosing,
thinking,
and acting for <br>
oneself;
freedom from control or restriction </span><span
style=" font-size:12pt"><br>
<br>
</span><tt><span style="
font-size:10pt">_______________________________________________<br>
<br>
Shop-talk@autox.team.net<br>
Archive: </span></tt><a
href="http://www.team.net/pipermail/shop-talk";><tt><span style="
font-size:10pt">http://www.team.net/pipermail/shop-talk</span></tt></a><tt><span
style=" font-size:10pt">
</span></tt><a href=http://autox.team.net/archive><tt><span style="
font-size:10pt">http://autox.team.net/archive</span></tt></a><tt><span style="
font-size:10pt"><br>
<br>
<br>
</span></tt>
<br>
<br>
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