So I’m a bit confused about the wiring of devices that say to use 2x wires (eg 2x 2/0 for a multiplus). I get that by using the two wires you are doubling the current carrying capacity (and surface area to dissipate the heat). My question is on the fusing side..
Normally you place a fuse on the positive wire close to the power source (eg battery) to protect the wiring (both positive and negative wires as the same current will flow). If something happens you can never have more than the fuse allows in either wire.
Now if you have 2x wires and you fuse them both, all is good for the positive wires - if there is a short in a wire, the fuse blows to protect the wire… BUT if you have an open (or bad connection) on one of your 2x negative wires, the other negative will then be carrying 2x the current - not good!
Why is this not seen as a problem.. or is it?
Is there a common solution (Fuse the Negatives as well?)
If this has been answered before, please point me to that post (which I didn’t find..)
