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29-11-2014, 18:27
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#1
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Registered User
Join Date: Jul 2009
Posts: 31
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Green Wire Confusion
hi everybody im confused on the whole ac green wire issue. my boat has the ac system setup with the black hot and white neutral wires going to my ac panel but the green ground wire splits off from shore power to both the the ac panel ground and the ground lug on my house battery bank. is this wire not supposed to go to a vessel bonding point or is it ok to be connected to the dc ground? help a newbie clear his confused mind. thanks
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29-11-2014, 18:35
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#2
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Registered User
Join Date: Jun 2013
Location: canada
Posts: 4,634
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Re: green wire confusion
the ac ground, dc ground, and ships bonding all get joined in north America.
different rules in euro
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29-11-2014, 18:40
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#3
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Long Range Cruiser
Join Date: Dec 2007
Location: Australian living on "Sea Life" currently in England.
Boat: Beneteau 393 "Sea Life"
Posts: 12,822
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Re: green wire confusion
I think Greeen is weird, Black is NOT hot but Neg. and white is Hot +.
But I am not aure, its certainly confusing me!
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29-11-2014, 19:08
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#5
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Registered User
Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 9,626
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Re: green wire confusion
Quote:
Originally Posted by MarkJ
I think Greeen is weird, Black is NOT hot but Neg. and white is Hot +.
But I am not aure, its certainly confusing me!
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Ahhhhh no!!!!!!!
North American 120 vac black = hot white = neutral , green = earth, that can be tied to the DC ground as well as the bonding system.
Sent from my iPhone using Cruisers Sailing Forum
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29-11-2014, 19:15
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#6
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Registered User
Join Date: Mar 2013
Location: South Jersey
Posts: 361
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Re: green wire confusion
Here in North America. Grid power, alternating current, Green is direct to earth, and is used as the safty. White is neutral to earth, and at the main panel will connect with green. Black is "hot" to earth. In 220 volt, red is often used as another "Hot" to earth, and 220V to black. In Direct current, Black is used as "ground" to battery, known as negative. Many other colors can be used as Positive, but mostly Red is used direct from battery or charging source. Clear as a rainbow.
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29-11-2014, 19:17
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#7
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Senior Cruiser
Join Date: Dec 2008
Location: Between Caribbean and Canada
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 8,492
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Re: green wire confusion
Dc
Red is hot
AC
Black is hot
DC
Neg black or yellow
AC
Neg white
DC
BOND green or Green yellow
AC
Protective ground. Green or green yellow
VERY CONFUSING.
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29-11-2014, 19:25
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#8
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Registered User
Join Date: Jun 2013
Location: canada
Posts: 4,634
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Re: green wire confusion
Quote:
Originally Posted by Zil
White is neutral to earth, and at the main panel will connect with green. .
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not on the boat. it is joined at the dock. and at the gen. and at inverter. not done in panel.
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29-11-2014, 19:36
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#9
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Senior Cruiser
Join Date: Dec 2008
Location: Between Caribbean and Canada
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 8,492
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Re: green wire confusion
Interesting. Can someone show me some article or standard that indicates where the AC negative/white is supposed to connect to the AC protective ground/green in marina circumstances. I presume it is somewhere in thee NFPA 130 but I don't have one handy.
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29-11-2014, 19:41
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#10
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Eternal Member
Join Date: Jul 2006
Posts: 4,046
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Re: green wire confusion
It is a bit confusing. But, for those with more than a half brain, not that much.
AC in US: in single-phase systems, black is HOT, white is NEUTRAL (not negative, there's no negative in AC), and green is ground to earth (at the source, not on the boat). In multi-phase systems other colors obtain.
DC: red is positive, black or yellow is negative. Yellow has recently been added because of the potential confusion between DC black (negative) and AC black (hot).
Authorities differ over whether or not to tie AC ground to DC ground on the boat. Both are in common use.
Bill
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30-11-2014, 04:59
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#11
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Registered User
Join Date: Jul 2009
Posts: 31
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Re: green wire confusion
thanks everyone clear as mud now haha. but glad to know that my ac ground is connected ok.
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30-11-2014, 05:39
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#12
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Registered User
Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,131
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Re: green wire confusion
--and then we have UK and EU standards with AC blue and brown.
__________________
so many projects--so little time !!
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30-11-2014, 09:10
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#14
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Registered User
Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 5,176
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Re: green wire confusion
Quote:
Originally Posted by smac999
not on the boat. it is joined at the dock. and at the gen. and at inverter. not done in panel.
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Correct, but not at the dock, at the marina's panel.
__________________
Ron
HIGH COTTON
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30-11-2014, 09:18
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#15
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Registered User
Join Date: Feb 2008
Location: North Charleston, SC
Boat: Camano Troll
Posts: 5,176
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Re: green wire confusion
Understand that there are standard color codes but that your boat may have been wired differently, either by the manufacturer (mostly on an old boat) or by a previous owner or someone hired to work on the boat. Often, someone will use a different color than what should be used rather than stopping work and driving to a supplier.
For anyone confused by this, step back and hire a pro. Connecting wires incorrectly can damage equipment, shock or electrocute humans or set the boat on fire.
__________________
Ron
HIGH COTTON
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