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Battery Terminal and Fuse Block Suggestions


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rr pilot 
Member - Posts: 7
Member spacespace
Joined: February 02, 2015
Location: California, United States
Posted: February 04, 2015 at 7:02 PM / IP Logged  
500W RMS mono sub amp.
Please provide suggestions on good products based on your experience. Are some designs better than others?
I'd rather use an ANL type fuse holder, and by viewing the internet I see there are some terminals and also fuse holders that have digital voltmeters built in. Are there any drawbacks to using these types?
TIA
Appreciate your help!
oldspark 
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Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 04, 2015 at 9:02 PM / IP Logged  
I'll leave amps to others.
As to fuses, definitely NOT glass types etc. Probably any "single pressed" metal type is fine (ie, ANL, ATS) tho for high currents (IMO ~40A & above) their terminals should be bolted.
As for fuse holders etc with voltmeters, has anyone ever explained WHY they are any good?
IMO forget them unless you don't care about system voltages but want something that impresses those that know no better, or a fixed and remote voltage measuring location that can drain your battery.
rr pilot 
Member - Posts: 7
Member spacespace
Joined: February 02, 2015
Location: California, United States
Posted: February 05, 2015 at 4:52 PM / IP Logged  
oldspark
point taken.
another question i forgot to ask, is what size ANL fuse should i use after the battery? i will be running the the JLAudio 600/1 500w sub amp.
im either going to run a 4awg or two 8awg power wires from front to back, i havent really looked into the liners to see how difficult it will be to run a 4awg.
Appreciate your help!
oldspark 
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Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 06, 2015 at 5:07 AM / IP Logged  
LOL - I figured people here we too smart for the crap of the norm. (However sometimes we need a kick to think and thus realise...)
Fuse big enough to handle the load - usually with at least ~25% extra rating - but no larger than the cable rating and of anything downstream until the next fuse takes over.
oldspark 
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Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 06, 2015 at 3:51 PM / IP Logged  
BTW, when using 2 parallel wires, each wire should be fused.
When the extra same-rating wire is added to an existing fused wire - ie, to reduce resistance as opposed to increase current capability - it's not an issue because the existing fuse protects both.
But when 2 (or more) wires are used in lieu of a heavier wire and their common fuse is rated higher than any wire, the usual fusing rules apply - ie, each wire is to be fused.
There are 2 common exceptions to the above.
One is where physical security is such that short circuits to GND etc AND wire or its failure of its connection will not happen.
The second is when protecting against direct shorts whereby the fault (short-circuit) current guarantees fuse blow.
Of course such overratedfuses will not protect from overloads. F.ex a 200A fuse protecting two parallel 100A wires will not blow if one wire then carries 200A (or 150A etc) eg - if the other wire breaks connection or goes high(er) resistance.
And chances are that a wire carrying double its rated current (hence 4x the heat) will flame...
rr pilot 
Member - Posts: 7
Member spacespace
Joined: February 02, 2015
Location: California, United States
Posted: February 06, 2015 at 4:09 PM / IP Logged  
oldspark
although i fully intended to ensure correct wiring/fusing, i had not considered all of which you state. good info. much appreciated.
getting back to one of my other questions please: the amp i chose has an internal 60A fuse. so i presume the amp will draw up to this amount at any given time. is this the figure to calculate the upstream battery fuse? 60A x 1.25 = 75A fuse?
btw, i never said i was smart, but i know enough to be dangerous Battery Terminal and Fuse Block Suggestions -- posted image.
Appreciate your help!
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: February 06, 2015 at 4:30 PM / IP Logged  
No. You use the amp's specs to determine your wire size.
The fuse size is determined by the distribution rating - ie, wire & connectors.
A smaller than distribution fuse can be used. That is not uncommon when using oversized distribution. Sometimes the equipment protection fuse is used for distribution (assuming it's rated lower than the distribution of course) - ie, moved away from the amp/load for easier servicing.
Series fuses of equal or near-equal rating should never be used unless it's ok replacing all such fuses when one blows or suffers a damaging overload or naturally degrades over time. (I'm ignoring discrimination - ie, where (series) fuses have different reaction characteristics to blow in a controlled hierarchy or protect for a specific overload.)
Note that distribution fusing has otherwise nothing to do with equipment protection fusing.
Furthermore, equipment protection fuses often run at higher then the normal ~70% rating rule. (That depends on what is being protected. Motors may use larger normal fuses or smaller slo-blo fuses. Amps may run closer to 100% to react quicker to overloads and hence better protect output transistors etc.)
BTW - the >25% extra rating or overhead is based on the general fuse (components) should generally run no higher than 70% of their rating rule.
FYI - my automotive electrical distribution is typically way overrated. That may be for future expansion but usually it's because I typically exceed "normal" acceptable performance and hate voltage drops, or prefer brighter lighting (I'm oldskool - I use halogen headlights), louder audio, max efficiency (at the cost of $ & weight), etc.
Hence my distribution fuses are rarely effected by downstream faults below the next fuse (eg, HU or amp fuse blows).
rr pilot 
Member - Posts: 7
Member spacespace
Joined: February 02, 2015
Location: California, United States
Posted: February 06, 2015 at 5:21 PM / IP Logged  
ahhh. yes. fuse is relative to wire size. wire size relative to power output. its coming back to me. thanks.
and i agree with you. and i tend to over-do some things just for my own minds sake.
im guess im just getting lazy and dont want to run that 4awg wire. but i will.
and i guess i will replace the stock lug with a fancy terminal.
cheers
Appreciate your help!

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