In article ,
Scott Gardner wrote:

Since the fuse near the battery for the main power lead is only to
protect the wiring, you just have to make sure that you use a fuse
that will blow before the wire is damaged. In this case, a 135-amp
fuse or breaker would do the trick.

That's not the _only_ thing to worry about. In practice, it's far safer
to use a fuse of equal or lesser rating to the fuses at the far end: you
cannot need _more_ current, after all (and if you have multiple fused
devices at the far end, in practice they will almost certainly never
present maximum draw at exactly the same time), and a fuse of lesser
rating at the battery will blow sooner if the wire is physically
damaged, which is a real concern. A 2ga wire going through a grommet
at the firewall that some later idiot knocks out of place is a lot
less likely to start a fire if fused for the devices at the far end than
if fused for the theoretical capacity of the wire (in practice, if you
really _need_ 2ga because of the current draw, you're going to get a
fire anyway if the insulation is damaged and it shorts to something,
but you know what I mean).

--
Thor Lancelot Simon

"The inconsistency is startling, though admittedly, if consistency is to be
abandoned or transcended, there is no problem." - Noam Chomsky