Go Back   Team-BHP > Under the Hood > In-Car Entertainment


Reply
 
Thread Tools Search this Thread
Old 18th May 2009, 23:49   #1
Senior - BHPian
 
abhinav.gupta88's Avatar
 
Join Date: Sep 2007
Location: Delhi , India
Posts: 4,087
Thanked: 308 Times
Default Finding Fuse Rating

Gurus

I wanted to know how exactly should be the fuse rating calculated.
i.e. What rating of fuse should be used in the fuse holder.

Is it according to the wiring used or according to the fuse rating on the amplifier(s)

Thanks in Advance.
abhinav.gupta88 is offline   Reply With Quote
Old 19th May 2009, 09:15   #2
Senior - BHPian
 
panky12345's Avatar
 
Join Date: Mar 2006
Location: New Delhi
Posts: 2,652
Thanked: 126 Times
Default

What I think is adding up the fuse ratings on all the amps that you're using and choosing a slighly lower rating fuse in the fuse holder (safety).

Say the total comes out to be 210 on all the amps.. then the fuse rating in the holder should be 200.
panky12345 is offline   Reply With Quote
Old 19th May 2009, 09:25   #3
Senior - BHPian
 
karankapoor's Avatar
 
Join Date: Apr 2008
Location: in the car!!!
Posts: 1,679
Thanked: 2 Times
Default

no no panky its the other way, say if you are using 2 amps and there fuse rating are 200A then you should use atleast 225 A fuse or higher then this. reason if you use a lesser A fuse it will blow.
karankapoor is offline   Reply With Quote
Old 19th May 2009, 10:14   #4
Senior - BHPian
 
DerAlte's Avatar
 
Join Date: Mar 2007
Location: Bangalore
Posts: 8,076
Thanked: 2,876 Times
Default

It should be as per the fuse rating on the amplifier, and not the cable current rating. In most cases the cable can carry the full short circuit current for quite some time before insulation breakdown.

Ideally you should leave a 30% margin above the total current drawn. This is to take care of short-duration current overloads and heating up of the fuse under such conditions. If the consumption is 30% higher than normal for sustained periods, the fuse *should* blow. Current spike conditions (going up sharply and coming down sharply) should not blow the fuse, whereas short circuit conditions should blow it immediately.

Keep in mind the amp fuse (slow blow) and the fuse-block fuse you want to use (fast blow) are different types. The external fuse should blow only on short-circuit; the internal fuse of the amp is always designed to work for different conditions the amp faces.

Last edited by DerAlte : 19th May 2009 at 10:20.
DerAlte is offline   Reply With Quote
Old 19th May 2009, 10:19   #5
Senior - BHPian
 
panky12345's Avatar
 
Join Date: Mar 2006
Location: New Delhi
Posts: 2,652
Thanked: 126 Times
Default

.. oops my bad! wanted to write the otherway. think I got up early today :-)
panky12345 is offline   Reply With Quote
Old 19th May 2009, 11:25   #6
Senior - BHPian
 
abhinav.gupta88's Avatar
 
Join Date: Sep 2007
Location: Delhi , India
Posts: 4,087
Thanked: 308 Times
Default

thanks guys. So for something with a total of 100 , one should use 30 percent more that is 130. Is that correct?
abhinav.gupta88 is offline   Reply With Quote
Old 19th May 2009, 13:05   #7
Senior - BHPian
 
karankapoor's Avatar
 
Join Date: Apr 2008
Location: in the car!!!
Posts: 1,679
Thanked: 2 Times
Default

As i earlier said if you amp fuse rating is 100 A you can use 125 or 150A inline fuse, but i doubt you can find inline fuse of that rating(130 A) they come as 100A/125A 150A/175A/200A. so go with 125 A fuse will work fine.
karankapoor is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuse Holder Problem !!!! low_bass_makker In-Car Entertainment 39 2nd January 2010 20:31
Amplifier rating Vs Speaker rating CaAT In-Car Entertainment 28 31st October 2008 19:32
Is it a fuse problem sreenivass Technical Stuff 11 6th January 2008 14:03
2004 Ford Ikon 1.6 nxt repeated ECM Fuse blowout 1100D Technical Stuff 13 22nd February 2007 22:02
indigo cigarette lighter fuse location shldn Technical Stuff 3 11th May 2006 12:17


All times are GMT +5.5. The time now is 16:59.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks