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 _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray -------------------------------------------------------------------------------- _______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
_______________________________________________ Thanks everyone for supporting this list with your contributions. Each and every one is greatly appreciated. If you want to support the list - use PayPal to send contribution -- https://www.paypal.me/stumurray
