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ANL Distribution Panel

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longg(at)pjm.com
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Posted: Fri May 16, 2008 9:54 am Post subject: ANL Distribution Panel

I was reading my Porsche Boxster repair manual the other day...



Porsche uses a distribution box which has 5-6 ANL fuses mounted inside.

Picture it as a fuse block with hookups for ANL type fuses. The purpose

is to distribute current protected by various amperage ANL's to fuse

blocks segments which are organized by function and size. 



Has anyone attempted this kind of design and is there any value of which

surpasses the increased part count?



Thanks



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nuckolls.bob(at)cox.net
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Posted: Fri May 16, 2008 11:40 am Post subject: ANL Distribution Panel

At 01:50 PM 5/16/2008 -0400, you wrote:



 	  Quote: 	
		  



I was reading my Porsche Boxster repair manual the other day...



Porsche uses a distribution box which has 5-6 ANL fuses mounted inside.

Picture it as a fuse block with hookups for ANL type fuses. The purpose

is to distribute current protected by various amperage ANL's to fuse

blocks segments which are organized by function and size.



Has anyone attempted this kind of design and is there any value of which

surpasses the increased part count?


	




    The ANL style fuse is the easiest device to

    accommodate with a DIY fuse block. Further,

    know that there are some miniature siblings to

    the relatively 'boss-hogg' ANL devices. Here's

    an ANL base:



http://www.aeroelectric.com/Pictures/Fuses/Fuse_Holders/ANN-ANL_Base.jpg



    Here's a base intended to mount the MEGA series

    current limiters:



http://www.aeroelectric.com/Pictures/Fuses/Fuses/all_mega.JPG



http://www.aeroelectric.com/Pictures/Fuses/Fuses/megafuse250.gif



http://www.aeroelectric.com/Pictures/Fuses/Fuse_Holders/mfb736_angle.gif



http://www.aeroelectric.com/Pictures/Fuses/Fuse_Holders/mfb736_dwg.jpg



    Here are some alternative, high current, stud mounted

    devices:



http://www.aeroelectric.com/Pictures/Fuses/Fuses/ABI_fuses.jpg



http://www.aeroelectric.com/Pictures/Fuses/Fuses/BF2.jpg



    The common thread for mounting these or similar fuses

    is a pair of sturdy, captive threaded posts. These

    can be steel bolts (we don't depend on bolt for

    current carrying). Fabricate a block from sturdy,

    insulating material like phenolic, Delrin, Polysulphone,

    etc. You need some sheet material with a thickness on

    the order of 1/2 to 5/8 inch. Drill hole pattern for

    installation of one or more fuses. Counter bore back

    side to take heads of bolts just under flush. Install

    bolts with one nut and no washer. Pot the head of the

    bolt with JB Weld. After epoxy sets up, remove nut

    and re=install using thread locker on nut. JB Weld

    works here too. Torque down real good.



    Of course, you'll need mounting holes in the base

    for installation. You may also need a copper sheet

    or brass bus-bar between studs at one end. Go

    3/4" wide x .062 or more thickness.



    After the stud-nuts cure, install in a/c and

    set your fuse down first before stacking terminals

    onto the studs. Put flat washer on and secure with

    fiber lock-nut torqued to value recommended by AC43.13 for

    steel parts of same size. Hold your wires stationary

    while applying final torque so that you avoid

    this:



http://www.aeroelectric.com/Pictures/Fuses/Fuses/ANL_Twisted.jpg



    Once assembled, the system is quite stable due to

    rigidity of the potted heads on studs.



    Bottom line is that with a little time at the table

    saw, drill press and belt sander, you can build

    a perfectly acceptable fuse block for any of the

    many choices of stud-mounted protective devices.



    Here's a multi-fuse installation on a production

    aircraft:



http://www.aeroelectric.com/Pictures/Wiring_Technique/Contactor_Interconnect/Contactor_Strap_3.jpg



    We COULD have made a much smaller and lighter

    installation from scratch but the qualification

    costs were prohibitive. You folks are not so

    hindered . . .



    Bob . . .

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