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ohms law clarification


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chassis 
Copper - Posts: 244
Copper spacespace
Joined: September 21, 2014
Location: South Africa
Posted: January 24, 2015 at 2:55 AM / IP Logged  
Hi! I'm sorry I'm back on this post.I have a question,eg.if I use a load that is rated at 10A with a 10A wire,i need a fuse rated at 15A.what will happen if I put a load rated at 20A on a 10A wire with a 15A fuse? some say the fuse will blow as the load tried to pull 20A through a 15A fuse,some say it will not blow as a 15A fuse's blow rating is 30A.so if it doesn't blow the fuse,will the insulation melt and the wire heat up?
Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 24, 2015 at 8:27 AM / IP Logged  
chassis wrote:
I use a load that is rated at 10A with a 10A wire,i need a fuse rated at 15A...
... and hence DOES NOT protect the 10A wire (another VAG in ashes).
chassis wrote:
...what will happen if I put a load rated at 20A on a 10A wire with a 15A fuse?
As above, a fire is likely.
If the load is pulling 20A or higher (as opposed to it being rated as 20A), maybe the fuse will blow before the 10A wire ignites.
Some say the dumbest things.
I think others like trouble - ... it will not blow... because the flaming wire has opened its fault. If they are serious about a 15A fuse's blow rating being 30A then IMO they should seriously consider limiting their liability,
chassis 
Copper - Posts: 244
Copper spacespace
Joined: September 21, 2014
Location: South Africa
Posted: January 25, 2015 at 4:58 AM / IP Logged  
Thank you Old Spark!
Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.
davep. 
Gold - Posts: 639
Gold spacespace
Joined: May 27, 2011
Location: California, United States
Posted: January 25, 2015 at 11:13 AM / IP Logged  
    Calculate total load in Amps.
    Choose a wire size that carries that load, for the distance required, with an acceptable voltage drop for that type of load. (There are numerous tables on the net for this).
    Fuse size to protect that wire gauge.
Fuses protect the wire, not the device connected to it.
Easy-peasy.
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