Same reason the SSB has a fuse in the ground lead too. If the negative battery lead comes off the engine but the bonding wire stays on, any equipment like an SSB that have grounding connections can become the link the current uses.
Joe Della Barba Coquina From: CnC-List [mailto:[email protected]] On Behalf Of Frederick G Street via CnC-List Sent: Monday, July 14, 2014 2:18 PM To: Burt Stratton; [email protected] Subject: Re: Stus-List bonding strap question Skip - one other note from the ABYC standard: Note: the bonding wire (or cables) to the engine(s} must be large enough to cany cranking current, because a break in the cranking circuit could cause the cranking current to flow in an alternate path (such as fuel lines). Sorry - I neglected that one before. It's been several years since I was ABYC-certified. Fred Street -- Minneapolis S/V Oceanis (1979 C&C Landfall 38) -- Bayfield, WI On Jul 13, 2014, at 8:59 AM, Frederick G Street <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> 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
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