I’m going to presume the power wires are twisted in order to minimize any 
electromagnetic fields developing that would cause a noise signal that the 
instrument wires would be vulnerable to and would interfere with signals 
therefore giving erroneous readings. The signal wires probably don’t carry 
enough current to cause any interference.

My $0.02 worth,

Tom S

From: Bill Coleman via CnC-List 
Sent: Sunday, April 26, 2020 9:29 PM
To: cnc-list@cnc-list.com 
Cc: Bill Coleman 
Subject: Re: Stus-List NMEA 0183 vs. 2000 Wiring Compatibility

That is an interesting point, I forgot about the power carrying capabilities of 
two of the wires. Got me curious so I pulled out a N2K connector to one of my 
components, the CPU. And it's not exactly what I thought I would find. The 
actual wires appear to be about the same gauge, not really sure but pretty 
small. But the black and red power carrying cables have very little insulation, 
and the wire appears to be twisted quite a bit, but the data carrying cables, 
the blue and white, have heavier insulation, but the wire strands appear to be 
laid straight. Kind of the opposite of what I would have thought of.  But there 
are only 4 wires, plus the braid around it all, which is not used on that 
connection.  . I guess the braid covering the whole thing is pulled out and 
becomes the fifth wire, the drain as they call it.  I will take some calipers 
down to the boat and compare the wire gauge of the 0183 wires to this N2K, 
maybe it will work.

 

Bill Coleman

Erie, PA

 

 

 

 

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Josh Muckley 
via CnC-List
Sent: Sunday, April 26, 2020 6:26 PM
To: C&C List
Cc: Josh Muckley
Subject: Re: Stus-List NMEA 0183 vs. 2000 Wiring Compatibility

 

Yes there is a spec for N2K wiring and it differs from 0184, however for 
relatively short runs (or for that matter even the longer ones) you'll probably 
be OK.  The biggest thing you'll want to verify is that the gauge of the 
conductors is matched for the power wires.  In N2K you'll find a red and black 
wire that are typically larger than the signal wires.  Those red and black 
wires supply power to all of the downstream devices.  One device is probably 
not a big concern... Multiple devices - might make a difference.  So if it is a 
branch you'll likely not have a problem, if it is a section of the backbone it 
might cause trouble.

 

Other than that, it is certainly worth a try.

 

Josh Muckley 

S/V Sea Hawk 

1989 C&C 37+

Solomons, MD

 

 

 

On Sun, Apr 26, 2020, 17:57 Bill Coleman via CnC-List <cnc-list@cnc-list.com> 
wrote:

  I am replacing some 0183 wiring for NMEA 2000, and I bought some 2000 end 
connectors (Maretron FA-NF-ST Mini Field Attachable Connector (Female)
  FA-NM-ST) that you can screw the terminals into. Some of this 0183 wiring was 
probably installed before the boat was completed, and It looks very difficult 
to re-wire. Does anyone know if I can just use the 0183 wiring to now become 
2000  compatible?  In other words, is there anything lacking in the older 
wiring, like shielding, twisting, etc, that would make this not work?

  Bill Coleman
  Erie PA



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