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clayhubler
Joined: 03 Aug 2019 Posts: 286 City/Region: La Center
State or Province: WA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: Hammerhead
Photos: Hammerhead
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Posted: Wed Jun 30, 2021 1:47 am Post subject: Difference between DC grounding and DC - bus |
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What is the difference between the two bus bars on the back of this panel and what would be the most common reasons for these to be separate? It is a paneltronics circuit breaker panel.
Thanks
_________________ Clay on Hammerhead
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T.R. Bauer
Joined: 17 Nov 2007 Posts: 1763 City/Region: Wasilla
State or Province: AK
C-Dory Year: 1993
C-Dory Model: 22 Cruiser
Vessel Name: C-Whisperer
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Posted: Wed Jun 30, 2021 9:08 am Post subject: |
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Great question. I can't wait to hear the answer myself. |
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ssobol
Joined: 27 Oct 2012 Posts: 3396 City/Region: SW Michigan
State or Province: MI
C-Dory Year: 2008
C-Dory Model: 22 Cruiser
Vessel Name: SoBELLE
Photos: SoBelle
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Posted: Wed Jun 30, 2021 10:33 am Post subject: |
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Normally you would see that in a setup that a +DC and a -DC supplies (e.g. +15v, -15v). So you have the two voltages and a DC ground (which is used for shielding and if you only needed one or the other of the voltages on a load.
On a 12vdc boat, I don't know what it would be used for. I'll bet that both the DC ground and the -DC voltage gets tied back to the negative battery terminal somewhere. |
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thataway
Joined: 02 Nov 2003 Posts: 20875 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Wed Jun 30, 2021 11:17 am Post subject: |
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A slight expansion on what ssobol commented. The "Green wire" in a boat is often DC ground (somewhat different than AC ground). It is for shielding of various electronics cabinets, and in some boats it also ties the thru hull fittings together.
For true RF shielding such as for an auto pilot when running high power SSB rigs, we use copper foil (about 1 mm thick and 2 to 3" wide. This gives far better RF shielding than just a wire.
As ssobol notes these all also go to the negative of the battery.
The only C-Dory I used this type of ground on was my Tom Cat 255, where I had a 100 watt SSB radio. _________________ Bob Austin
Thataway
Thataway (Ex Seaweed) 2007 25 C Dory May 2018 to Oct. 2021
Thisaway 2006 22' CDory November 2011 to May 2018
Caracal 18 140 Suzuki 2007 to present
Thataway TomCat 255 150 Suzukis June 2006 thru August 2011
C Pelican; 1992, 22 Cruiser, 2002 thru 2006
Frequent Sea; 2003 C D 25, 2007 thru 2009
KA6PKB
Home port: Pensacola FL |
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clayhubler
Joined: 03 Aug 2019 Posts: 286 City/Region: La Center
State or Province: WA
C-Dory Year: 2003
C-Dory Model: 22 Cruiser
Vessel Name: Hammerhead
Photos: Hammerhead
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Posted: Wed Jun 30, 2021 11:19 am Post subject: |
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Thanks everybody. Should I just tie these together then for a larger negative bus? |
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thataway
Joined: 02 Nov 2003 Posts: 20875 City/Region: Pensacola
State or Province: FL
C-Dory Year: 2007
C-Dory Model: 25 Cruiser
Vessel Name: thataway
Photos: Thataway
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Posted: Wed Jun 30, 2021 6:04 pm Post subject: |
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No reason to tie together unless you need more terminal posts. |
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