Hi Dennis- That makes sense. I also have MRBF fuses on both batteries, so I could presumably do the same. It would certainly simplify the wiring to just connect that heavy battery cable at the panel end to a Powerpost and run from that to the various circuits. I am never confident about doing fuse issues correctly, so this helps a lot. Dave
S/V Aries 1990 C&C 34+ New London, CT > On Mar 12, 2020, at 2:18 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com> > wrote: > > The PowerPost is about halfway between the battery switch and breaker panel. > Less than 3 foot runs each. The PowerPost is essentially fused because there > are MRBF fuse blocks on the battery positive posts. Therefore, whether the > battery switch is on "1" or "2", there is a fuse prior to the battery switch > and therefore the PowerPost. The MRBF fuses on the batteries serve Touche's > entire electrical system except the bilge switch which is supplied directly > from a battery and has its own fuse. > > Hope that clarifies for you. If not, just holler. I plan to be on the boat > this weekend if you need more info. > > Dennis C. > > On Thu, Mar 12, 2020 at 12:49 PM David Knecht via CnC-List > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > 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 > > <pastedGraphic.tiff> > >> On Mar 11, 2020, at 1:59 PM, Dennis C. via CnC-List <cnc-list@cnc-list.com >> <mailto: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 >> >> > > _______________________________________________ > > 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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