Amp/power wire question

[blazeplacid 10+ year member]

Well I got a Rockford P400-4 as a gift from the GF //content.invisioncic.com/y282845/emoticons/eek.gif.771b7a90cf45cabdc554ff1121c21c4a.gif//content.invisioncic.com/y282845/emoticons/veryhappy.gif.fec4fed33b4a1279cf10bdd45a039dae.gif

Well the amp has no internal fuses.

Rockford states to use 4 ga wire with an 80amp fuse.

Well that sounds about right BUT

I have 8ga ran right now.

The birthsheet states 550rms~(like 551or 553 cant remember exact)

Well ohms law calulated out seems that 8ga would be ok 550/14.4= 38 amps

Now I now voltage will go up and down but the amp should not pull more than 50 amps right????

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[jco1385 5,000+ posts]

i'd go with the mfg recommendation.

 

[mdillon 10+ year member]

if you go with a smaller fuse, the only thing that would be damaged will be the fuse if it blew. my sub amp is rated at pulling 120amps. i have a 80 amp fuse on the power wire and havent had any problems.

 

[blazeplacid 10+ year member]

yeah I was thinking the same thing

Worse case the fuse blows and I know I need lager gauge wire

 

[mapolley07 10+ year member]

most 8 gauge wire is rated for about 80 amps.....you should be fine with 8 ga. wire. they just want you to spend more money by recommending 4ga.

 

[adas Pro Seller]

8ga will be fine, I'd probly use a 60a fuse, 80 seems like a LOT for that amp

 

[blazeplacid 10+ year member]

wel I am going to usea 60 amp fuse

I agree 80 sounds like they are going by the wire ampacity which is what your supposda do anyways