Determining fuse sizes - Page 2 - Fiberglass RV


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Old 01-13-2010, 12:59 PM   #15
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Thank you to all who responded. Sounds like we're here to learn a thing or two from eachother.

My fuse terminal block uses the glass fuses, so that's what I'm working with.

So say I use 12g wire for a circuit, but the light I am using has skinny wires (18g) in the fixture itself. Is this difference relevant to anything?

Also, how do you join 12g wire to 18g wire? Those crimping type connectors are sized for only one gauge.


Fran
If the light has 18 gauge wire there is no need to run 12 gauge to those connections unless there will be other loads on that circuit. If you do plan to connect 12 gauge to 18 gauge DO NOT use wire nuts, they are not designed for that type of connection and should never be used on these type of 12 volt circuits. Neatly solder and heat shrink the connections, to make the connection watertight shrink a few layers of tubing over the small wire to make it similarly sized to the bigger wire so the final heat shrink tube that goes over the solder joint will be tight on both sides. You could also use splicing tape, it looks like thick electrical tape, you wrap it really tightly around the connection and it self fuses into a watertight connection.
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Old 01-13-2010, 01:20 PM   #16
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I disagree, you will get less voltage drop whenever you run a larger wire. so if you run #12 for 15 feet and then connect to 10 iches of #18, you are better off than running #18 the whole way. ----- besides the #18 appliance might not be the only thing on the circuit. Now or in the future.

I also recomend wire nuts when the sizes are dissimular, it works just fine. Just be sure you strip plenty of insulation off so that you get a good wrap of the strands.
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Old 01-13-2010, 02:58 PM   #17
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If the light has 18 gauge wire there is no need to run 12 gauge to those connections unless there will be other loads on that circuit. If you do plan to connect 12 gauge to 18 gauge DO NOT use wire nuts, they are not designed for that type of connection and should never be used on these type of 12 volt circuits. Neatly solder and heat shrink the connections, to make the connection watertight shrink a few layers of tubing over the small wire to make it similarly sized to the bigger wire so the final heat shrink tube that goes over the solder joint will be tight on both sides. You could also use splicing tape, it looks like thick electrical tape, you wrap it really tightly around the connection and it self fuses into a watertight connection.
In the mobile environment electrical connection are exposed to vibration and very variable humidity. I agree with John J. that a watertight soldered connection is a foolproof solution. A self fusing electrical tape or shrinkable tubing is my preferred ways to seal a connection. I use wire nuts at home only.
George.
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Old 01-13-2010, 05:57 PM   #18
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Wire Nuts:
Using the proper wire nut and taping it to the wire once it has been twisted properly should remain serviceable without any problems however if you really want to do it right, there is a crimp connector that looks like a top hat where you insert both wires in one end and then crimp the other end and everything is contained inside the connector. The connectors are semi transparent with a copper crimp ring inside. Go to the Home Depot or Lowes and look for them in the electrical department. (See Site Below)

Note: If you use in a damp location, it is advisable to fill the wire nut and/or top hat crimp with a dialectic grease first (B4) you twist tight and/or crimp. This keeps the elements from reaching the bare wires inside.

The rule for crimping is:
Crimp once. You never make a second crimp because the second crimp may loosen up the first crimp.

Crimp Tool:
The BEST crimp tool is a Ratcheting Crimping Tool, one that must be squeezed all the way down before it will release. (See Site Below)

WHY:
Because using a cheep tool that does not ratchet may not crimp all the way and you may loosen your grip and the tool may move and you wind up with a less than perfect crimp.

The Crimp Tool
http://www.harborfreight.com/cpi/ctaf/disp...temnumber=97420

The Crimp Connector:
http://www.idealindustries.com/prodDetail....insulated_ideal
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Old 01-13-2010, 10:06 PM   #19
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Francene,

These are low volt glass fuses that glow when they blow so you can see which fuse is bad right away as mentioned earlier...these are the glass type you will use.



Happy Camping, Safe Trails.

Harry

http://outlet.crutchfield.com/S-QMgYnde8YIn/p_082SFE0001/Littelfuse-Smart-Glow-SFE-Glass-Fuses.html?cc=07
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Old 01-14-2010, 12:31 AM   #20
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There are crimp connectors that "step" so that you can join two different wire sizes, in case that's what you'd like to use. If you choose to use them, I recommend high-quality, heat shrink connectors, such as those made by Ancor or 3M.

Raya
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