Yes using a large enough gauge wire will satisfy fault protection. Doing a coin short circuit test will verify if a given section of track is wire sufficiently to allow fault protection. But the very next reason above fault protection is to make sure trains maintain a given speed consistently when you run long wires..
A 1.2V drop at 120V represents a 1% voltage drop. No problem. But the same 1.2V drop at 12V, is a 10% drop. That will translate in a 10% drop in train speed.
I take your point. However, this is about a low voltage tabletop model railroad not the Northeast Corridor.
wouldn't say parallel conductors is "fraught with long term
reliability issues". It is done in industrial wiring when they
don't want to buy or string OOO wire. There are rules though:
don't put all the same conductor in one metal conduit (
induced currents )
each conductor needs its own circuit protection ( fuse or
clearly mark each conductor ( we should be doing this anyway )
main reason for the heavy wire is for fault protection. I use
heavy industrial wire, Oilflex and similar, 2mm dia.
On 3/26/2019 5:16 PM, David McBrayer
re doubling up wire.
If you parallel two no. 20 AWG conductors, the resulting
combined cross-sectional area would be approximately the same as
a no. 17 AWG conductor.
To get the approximate equivalent of a no. 14 AWG conductor you
would need to parallel four no. 20 AWG conductors. Paralleling
conductors is fraught with long term reliability issues. The
issues can be managed but they are not the least expensive way
I suggest you do a web search for “wire table” to see the
bigger picture of how AWG wire sizes are related. AWG numbers
have no direct relationship to cross-sectional area, which does
relate to current carrying rating. See also “metric wire table”
to see how they relate.
Yes, you can do it but be sure to notice how much hair you
have (or don’t have 😉) when start troubleshooting some day down
Castro Valley, CA
I am new to this group. Just have a simple
question. If a buss wire "should" be AWG14. Would two AWG
20's twisted/soldered together be sufficient. All the stuff
I see is so complicated and overwhelming to me that I don't
understand wires. I note that two AWG 20 gauge wires are the
same size as AWG 14. And when I test with a meter, see no
voltage drop with the "double twisted soldered" wires. In
fact, the DC voltage and amperage is the same when tested
with loco on track. I hope I'm clear, and just want
clarification on wire size.
Morgan Bilbo, new to DCC