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christian-cochet asked

Where Do Put the Input Fuse?

Does it matter where the fuse/breaker on B2B or secondary alternator Install is located in the input cable? Generally on Orion 12-12/30 setups I run #4 cable for single and #1 cable for dual Orion setups, with 60 or 120 amp Blue Sea 285 circuit breakers respectively, in my Electrical Cabinets usually at the rear of the van 20-25 foot run of cable from chassis battery to Orion/Orions input. I do this so all my major breakers and fusing are inside my electrical cabinet, not randomly about the van like under a van, inside a battery box, or on the side of a seat base. My understanding is that this breaker would provide the adequate short circuit/current over load protection for the input cable, because it shoud fail before the cable does. My supplier is saying the fusing/breakerage needs to be at the other end at the chassis battery? Does it matter where in Line it is? The same goes for my wake speed secondary alternator setups, I run a 4/0 black and red cable from the alternator to the rear of my cabinet, terminate and fuse them in the Victron Lynx Distributor in the rear electrical cabinet.

Any insight would be helpful

orion dc-dcalternator
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1 Answer
pwfarnell avatar image
pwfarnell answered ·

The fuse should be located as close to the battery as possible because the battery is the unregulated source of very high current should a short occur. In your set up f

There is 20-25ft of unprotected cable should a short occur. You are not protecting against over current from the alternator or Orion as these are limited sources.

As a support of placing the fuse next to the battery take the AYBC (American Yacht & Boat Council) wiring regs require the fuse to be within 7" of wire of the battery terminal and the European ISO standard for small craft requires 200mm (8" ).

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christian-cochet avatar image christian-cochet commented ·

Thank you! Makes more sense now!


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