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27-11-2016, 13:35
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#31
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Commercial Member
Join Date: Dec 2008
Location: St. Petersburg, FL
Boat: Gulfstar Long Range Trawler; 53'; BearBoat
Posts: 1,534
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Re: DIY ANL Fuse Block?
smac999: I think you are concurring with me that circuit breakers used in marine applications do have AIC ratings. Correct?
Regarding your excerpt from the Blue Sea Systems "abyc AIC chart" there have been some changes:
AIC Table.pdf
Note that the table does not apply to LFP or TPPL batteries because of their higher energy density.
Also note that for battery banks >500Ahr or with >2200CCA; the OCPD must have an AIC equal to or greater than the short circuit potential of the bank based on the battery manufacturer's technical specs. If the short circuit potential of the battery is not available from the manufacturer, than the OCPD AIC must be equal to or greater than 100 x nominal battery (bank) Ahr rating (E-11.10.12.3)
__________________
Charlie Johnson
ABYC Master Technician
JTB Marine Corporation
"The Devil is in the details and so is salvation."
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28-11-2016, 05:04
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#32
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Registered User
Join Date: Oct 2011
Boat: Valiant 42
Posts: 6,008
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Re: DIY ANL Fuse Block?
Can't tell from the pictures but a common DIY mistake in DC systems is related to the hardware stackup. Never ever use plastic or fiberglass as part of the layers that compress to fasten an electrical connection. It is common to see a piece of fiberglass squeezed by the nut or screw. This is a big no-no in electrical connections. Only squeeze metal to make the connection. Plastic changes size much more as temperature changes thus the connection will tighten and loosen on its own. This is a good way to start a fire.
Also, never ever allow high current to flow through a washer, threaded bolt or screw. Make sure the high current terminations (e.g. Lugs) are touching one another with nothing between them.
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29-11-2016, 02:55
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#33
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Registered User
Join Date: Feb 2011
Location: South-East Australia coast
Boat: 40ft fibreglass sloop
Posts: 201
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Re: DIY ANL Fuse Block?
Quote:
Originally Posted by transmitterdan
Also, never ever allow high current to flow through a washer, threaded bolt or screw.
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For the specific case of using a washer, as I sometimes do, what are the negative consequences when two ring terminals on the same stud are screwed down with a soft copper washer separating them?
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29-11-2016, 03:47
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#34
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Registered User
Join Date: Oct 2011
Boat: Valiant 42
Posts: 6,008
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Re: DIY ANL Fuse Block?
A soft copper washer isn't the best idea because it can loosen up over time. There isn't a good reason not to let the rings of the lugs touch one another. By adding a washer it doubles the number of surface contacts and increases heating which is what you want to avoid.
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29-11-2016, 04:02
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#35
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Registered User
Join Date: Oct 2011
Posts: 3,604
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Re: DIY ANL Fuse Block?
Okay, so let's say you have your buss bar and your fuse holders. How do you connect them? A short cable with two lugs on either end? That's more effIcient than hooking one end of the fuse directly to the buss bar?
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29-11-2016, 04:35
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#36
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Registered User
Join Date: Oct 2011
Posts: 3,604
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Re: DIY ANL Fuse Block?
From Sandero -
question:
I have placed a 1/4" thich plexi sheet bolted on stand off over all the 12v main wiring... busses, fuse blocks and switches etc. Most of the lugs have rubber shields (or whatever they are called). I removed the covers for the ANL fuse blocks. Would this approach be considered OK?
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29-11-2016, 06:10
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#37
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Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,362
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Re: DIY ANL Fuse Block?
Quote:
Originally Posted by Marqus
For the specific case of using a washer, as I sometimes do, what are the negative consequences when two ring terminals on the same stud are screwed down with a soft copper washer separating them?
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As noted by Dan, this is a bad idea.
Flat washers should only be used to separate terminals of dissimilar metals, which should be avoided.
ABYC E-11.16.4.1.11
No more than four conductors shall be secured to any one terminal stud. If additional connections are necessary, two or more terminal studs
shall be connected together by means of jumpers or copper straps.
➥ http://www.elettronavigare.it/files/...0americane.pdf
There are some excellent illustrations in the below link that show the best method of assembling ring terminals for stacking, including details about proper orientation of the ring terminals and use of flat washers and lock washers to make a secure electrical and mechanical connection.
➥ https://www.mitrecaasd.org/atsrac/nb...talsPart2a.pdf
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"
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29-11-2016, 06:18
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#38
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Registered User
Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,265
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Re: DIY ANL Fuse Block?
Quote:
Originally Posted by Delancey
Okay, so let's say you have your buss bar and your fuse holders. How do you connect them? A short cable with two lugs on either end? That's more effIcient than hooking one end of the fuse directly to the buss bar?
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You can buy (inexpensively) Bars to connect the fuse holders together
https://www.waytekwire.com/item/4639...ar-7-Position/
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29-11-2016, 09:17
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#39
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Registered User
Join Date: Oct 2011
Posts: 3,604
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Re: DIY ANL Fuse Block?
Quote:
Originally Posted by pcmm
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The missing link! Thanks
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29-11-2016, 12:42
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#40
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Registered User
Join Date: Mar 2010
Location: Annapolis MD
Boat: Building a Max Cruise 44 hybrid electric cat
Posts: 3,198
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Re: DIY ANL Fuse Block?
Good stuff, but shipping is expensive from them. Last $150 purchase had $60 shipping to Florida for 8 pounds of items.
Sent from my LG-V410 using Cruisers Sailing Forum mobile app
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29-11-2016, 16:03
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#41
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Registered User
Join Date: May 2014
Location: Whitby, Canada
Boat: Morgan Out Island 41
Posts: 2,265
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Re: DIY ANL Fuse Block?
Quote:
Originally Posted by funjohnson
Good stuff, but shipping is expensive from them. Last $150 purchase had $60 shipping to Florida for 8 pounds of items.
Sent from my LG-V410 using Cruisers Sailing Forum mobile app
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guess it all depends on what shipping options. I ordered enough crimp fittings, fuse blocks, breakers etc to do my whole 41ft sailboat and the shipping was only $30 to grand Island, NY.
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