Ours is done the same way. "Our boat has one keel bolt washer w a big lug welded to it. It is under the nut on the foremost bolt under the mast step and a stranded wire connects the mast to this washer, so the keel is the ground for the mast."
Ken H. C&C 37 XL Salazar 1990, Hull #67 Cape Breton Island On 15 July 2014 22:56, Chuck S via CnC-List <cnc-list@cnc-list.com> wrote: > FWIW, Our boat has one keel bolt washer w a big lug welded to it. It is > under the nut on the foremost bolt under the mast step and a stranded wire > connects the mast to this washer, so the keel is the ground for the mast. > > > Chuck > Resolute > 1990 C&C 34R > Broad Creek, Magothy River, Md > > ------------------------------ > *From: *"CNC boat owners, cnc-list" <cnc-list@cnc-list.com> > *To: *"Frederick G Street" <f...@postaudio.net>, "CNC boat owners, > cnc-list" <cnc-list@cnc-list.com> > *Sent: *Sunday, July 13, 2014 3:40:12 PM > > *Subject: *Re: Stus-List bonding strap question > > Hi Fred, > > > > Thanks for the response and the offer. I can deal with 4awg stranded wire > if that is an acceptable practice. My son in law is a master electrician > and has all the big crimpers I need. > > > > Here is the challenge and another question: Those keel bolts are really > big (close to 1 inch diameter, I bet) and I have not been able to find > termination hardware (rings or open rings) that would fit over them. I > noticed on my boat that there is a smaller bolt just forward of the mast > right in the center of the bilge, definitely directly over the front part > of the keel that is maybe 3/8 inch to ½ inch in diameter. Could this be > used for bonding? All the other braided bonding cables go to the big keel > bolts aft of the mast. This is bonding and lightning protection, not DC > ground. > > > > Skip > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of > *Frederick > G Street via CnC-List > *Sent:* Sunday, July 13, 2014 10:35 AM > *To:* Frederick G Street; cnc-list@cnc-list.com > *Subject:* Re: Stus-List bonding strap question > > > > Actually, there’s a reason to NOT use braid; from the ABYC bonding > standard: > > > > The common bonding conductor shall be uninsulated copper or bronze strip, > copper tubing, bare tinned-copper wire or insulated copper wire of the > proper gauge. > *Copper braid shall not be used for this purpose. * > (a) Common Bonding conductors fabricated from copper or bronze strip shall > have a minimum thickness of 1/32 inch and be no less than 1/2 inch in width. > > (b) Wire, where used as the common bonding conductor, shall be at least > no. 8 AWG. > > Note: These requirements are based on both physical strength and the > ability to make alld maintain low-resistance > connections, as well as current ratings. > > > > So 8AWG would be okay for bonding; UNLESS it’s part of a lightning > protection system. Then 4AWG is recommended. > > > > > Fred Street -- Minneapolis > S/V *Oceanis* (1979 C&C Landfall 38) -- Bayfield, WI > > > > On Jul 13, 2014, at 8:59 AM, Frederick G Street via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > Skip — there’s no reason to use braid over the usual insulated large-gauge > stranded cable. I’ve got all crimp terminals from 8AWG to 4/0, in terminal > sizes from #10 to 3/8”, as well as the proper compound crimper needed to do > those large lugs; if you’d like, I could do up a heavy grounding wire for > you. 4AWG green cable should be okay for the mast; I may actually have > some of that around, depending on the length you need. And for the engine, > if it’s just bonding (NOT the main DC system ground), 4AWG should be okay > there, too. If you need a main DC ground, I’d probably go bigger than > 4AWG; maybe 2/0 to account for engine cranking current. > > > Fred Street -- Minneapolis > S/V *Oceanis* (1979 C&C Landfall 38) -- Bayfield, WI > > > > On Jul 13, 2014, at 7:52 AM, Burt Stratton via CnC-List < > cnc-list@cnc-list.com> wrote: > > > > I am in need of a bonding conductor for both my engine block and mast. > Engine block strap is corroded to the point of dust. Mast strap is missing. > > > > The boat contains braided tinned copper straps with nice big ring ends to > fit over the keel bolts. I have been able to find braided flat straps but > no termination hardware. Does anyone here have experience with that? I have > lots of experience terminating standard stranded wire but never braided > straps. Is there a source for purchasing pre-terminated straps of varying > length? > > > > Skip > > 1974 C&C 33 ¾ ton > > Portsmouth, RI > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > > > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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