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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 05-01-2009
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Grounding

I am just wondering what I ground my electrical system to if I don't have an inboard engine. I know that there are grounding plates that are used for lightning, but would I use the same thing for grounding a DC system? Thanks!
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Old 05-01-2009
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The 12 VDC electrical system is grounded to the battery's NEGATIVE TERMINAL. Grounding the 12 VDC electrical system and setting up a lightning grounding/bonding system are two different things.
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Old 05-01-2009
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Hi Corey,

Bring all of the DC returns (ground) to a common point a ground bus.
Here are some samples to help you identify what you are looking for:




A Barrier Strip can also be used as a bus by linking the terminals together


The bus is ultimately connected to the NEG terminal on your battery
Hope it helps
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FYI—The top image is a buss bar. The bottom image is a terminal strip.
Quote:
Originally Posted by RanAweigh View Post
Hi Corey,

Bring all of the DC returns (ground) to a common point a ground bus.
Here are some samples to help you identify what you are looking for:




A Barrier Strip can also be used as a bus by linking the terminals together


The bus is ultimately connected to the NEG terminal on your battery
Hope it helps
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Quote:
Originally Posted by sailingdog View Post
FYI—The top image is a buss bar. The bottom image is a terminal strip.
Dan,
Isn't that precisely what I said? Look again buddy "a barrier strip can also be used by linking the terminals"
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I've never seen this called a barrier strip:



I'd also point out that a ground bus can take several forms... some use a single power post, like this:



Others will use a buss bar but the piece is actually called a BUSS BAR...A ground bus is an electrical concept, a buss bar is a piece of hardware that embodies the concept.

Quote:
Originally Posted by RanAweigh View Post
Dan,
Isn't that precisely what I said? Look again buddy "a barrier strip can also be used by linking the terminals"
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Quote:
Originally Posted by Coreyboy18 View Post
I am just wondering what I ground my electrical system to if I don't have an inboard engine. I know that there are grounding plates that are used for lightning, but would I use the same thing for grounding a DC system? Thanks!
With the DC system grounded to the negative terminal on the battery, you have a floating ground not connected to earth, like a car or plane. On a boat with an engine, connecting the engine block to ground earths the ground via the prop shaft to ocean. Were you wondering whether you have to connect the ground side of your DC system to earth (ocean) so that it is not floating?
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Ground really is a misnomer. Call it battery negative and nobody gets confused.

Unless you have grounding brushes on the prop shaft i'm not sure i would depend on the drive train to provide an absolute earth.
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Quote:
Originally Posted by HoffaLives View Post
Ground really is a misnomer. Call it battery negative and nobody gets confused.

Unless you have grounding brushes on the prop shaft i'm not sure i would depend on the drive train to provide an absolute earth.
Look what the cat dragged in!!!!

Welcome back man! Where ya been ?
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Old 05-02-2009
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Quote:
Originally Posted by RanAweigh View Post
Hi Corey,

Bring all of the DC returns (ground) to a common point a ground bus.
Here are some samples to help you identify what you are looking for:




A Barrier Strip can also be used as a bus by linking the terminals together


The bus is ultimately connected to the NEG terminal on your battery
Hope it helps
Great, thanks a lot. It does actually help quite a bit. I think in the process of reading all of this electrical info, I starting mixing AC and DC when it comes to grounding. So now it is a matter of getting the strip. Thanks a lot for your help, you too SD.
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