Hi Dennis- I just wanted to clarify your reply. The Powerpost Plus looks like a nice way to distribute power and I had not seen that. Do you have that near the main rotary switch or near the breaker panel? I gather this is not fused, so if I simplified the wiring by bypassing the fuses and putting it near the panel, I would lose the fuse before the breaker. In my setup, some power runs from the rotary to the 4 fuses and then to the panel. But those wires are not larger than about 10-12G and all the same size. There is also a heavy battery sized cable running from the rotary switch directly to a bus bar behind the panel. So those circuits would only have the panel breakers and no fuse. I don’t know what was original and what added later as all that predates my work on the wiring. I plan to map all the circuits this week so I know what comes from each wire. But that setup does not make sense given what Shawn says about the logic of the fuses near the rotary switch being so you could have a long run of heavy wire to the panel. Dave
S/V Aries 1990 C&C 34+ New London, CT > On Mar 11, 2020, at 1:59 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > Dave, > > Piggybacking the supply from one fuse to another is pretty common, especially > in older boats. Just need to ensure the proper wire size to carry the load > to all the users. Pre-made breaker panels have a solid buss bar which > carries the power supply to each breaker. The piggyback wiring is > philosophically analogous. > > Personally, there are better ways to do it. If there's a place for a buss > bar, you can route the power from the rotary switch to the bar then connect > each fuse to a connection on the bar. I would not stack a bunch of separate > wires on the switched connection on the rotary switch. > > On Touche', I have a Powerpost Plus, which is on the switched connection of > the battery rotary switch. That is, when the battery switch is "ON", the > Powerpost is live. A properly sized wire from the powerpost supplies a > couple of buss bars in Touche's breaker panel. Each breaker is then supplied > individually from the buss bar. > > Not sure about your comment on a fuse before a breaker. A better pic might > help. > > You should have a fuse at the battery. I have these on Touche': > > https://www.bluesea.com/products/5191/MRBF_Terminal_Fuse_Block_-_30_to_300A > <https://www.bluesea.com/products/5191/MRBF_Terminal_Fuse_Block_-_30_to_300A> > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > On Wed, Mar 11, 2020 at 11:58 AM David Knecht via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > I understand the wiring in general and how the circuit works. I am not sure > what the logic is to have created the double crimp tabs in order to bridge > power from one fuse to the other. I get that each fuse will function for the > circuit that goes to the panel. What I am unclear on is > #1, why have a fuse before a circuit breaker on the panel > #2- is this the “right” way to accomplish safe wiring. I could instead bring > separate wires off the + from the rotary switch to each fuse rather than the > bridging setup if I replace the current fuse holders. > > Thanks- Dave > > S/V Aries > 1990 C&C 34+ > New London, CT > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray > <https://www.paypal.me/stumurray> > > _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each and > every one is greatly appreciated. If you want to support the list - use > PayPal to send contribution -- https://www.paypal.me/stumurray >
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