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  #21  
Old 09-26-2017, 10:37 AM
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fl-mike fl-mike is offline
 
Join Date: Jul 2005
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Quote:
Originally Posted by az_gila View Post
Meantime, if you have an existing ANL fuse buy a few spares now on Ebay.
Waytek has them:
https://www.waytekwire.com/products/...-Type=ANL-Fuse
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Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS, L3 Lynx NGT-9000
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  #22  
Old 09-26-2017, 12:29 PM
txnbuilder txnbuilder is offline
 
Join Date: Sep 2006
Posts: 66
Default Fuseholder

Here the MIDI fuse holder I plan to use:

https://www.digikey.com/products/en/...rs/140?k=f3094

It has two mounting holes, which make it easy to attach to the firewall.
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Luis Orozco
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  #23  
Old 09-26-2017, 02:10 PM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 369
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West Marine carries the Blue Sea brand fuse block holder and ANL fuses:
https://www.westmarine.com/buy/blue-...97?recordNum=4
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Vonore, TN
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  #24  
Old 09-26-2017, 02:18 PM
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RV7A Flyer RV7A Flyer is offline
 
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Location: US
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Quote:
Originally Posted by fl-mike View Post
I got a box of something like 10 of these for *way* less than $9.00 each somewhere (Amazon? Ebay?) but I don't recall where now.
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  #25  
Old 09-26-2017, 02:19 PM
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Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
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Quote:
Originally Posted by John Tierney View Post
West Marine carries the Blue Sea brand fuse block holder and ANL fuses:
https://www.westmarine.com/buy/blue-...97?recordNum=4
That's what I use. 60 amp fuse iirc. I find marine eqpt works pretty well on little planes in many cases.
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  #26  
Old 09-26-2017, 02:28 PM
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johnbright johnbright is offline
 
Join Date: Aug 2010
Location: Newport News, Va
Posts: 325
Default Fat wires

Quote:
Originally Posted by rv7charlie View Post
Just to be clear, Nuckolls' writings/drawings include a protection device at the battery end of the alternator B-lead.

The 'fat wires' (post 18) mentioned are the very heavy gauge lines from the battery to the main contactor, and to the starter.
My understanding is:

The lead from the battery contactor to the main bus is a long "fat" wire.

The starter contactor is there to disconnect in case of a problem downstream from it.

One of Bob Nuckols' stories:

"Bottom line is that you're many, many times more likely to have a bad day in the cockpit for reasons far removed from a hard ground fault on your 6AWG bus feeder wire. . . and THAT because you didn't conduct due diligence in its installation.

In the case of the bus feeder, the risks are not so much to the wire as to the thing the wire touches.

Case in point: C90 twin turboprop on short final experiences disconnect of elevator cables. Pilot uses trim commands and power to execute go-around, assesses the condition and successfully lands the airplane with rudder, trim and power.

Pulling up floorboards in the cockpit revealed a 40A protected feeder to the windshield de-ice inverter had been mis-positioned against the elevator control cable during a maintenance operation. Over what had to be many hours of operation, motion of the cable wore through the insulation bringing the cable into contact with the hot wire. The arcing and sparking was of insufficient intensity to come to attention of crew in spite of the fact that it was going on virtually under their feet.

The copper wire was barely damaged. The breaker never popped while the elevator cable eventually eroded through and parted. Compare thermal properties of copper versus steel . . . this explains why the best steel safes have intermediate layers of copper in their construction. It's EASY to burn through steel . . . next to impossible on copper.

This narrative explains the high order probability that even if you DID get your 6AWG feeder faulted to ground, it's most likely to be a soft fault that burns a hole in your airplane while doing little damage to the wire . . . and certainly far short of getting it to smoke and/or open a fuse/breaker.

Adding 'protection' to this pathway doubles the number of joints in the pathway and adds nothing demonstrable in terms of fault response . . . which is why the spam-can builders don't do it either.

... Bob Nuckolls ..."
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  #27  
Old 09-26-2017, 02:53 PM
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az_gila az_gila is offline
 
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Quote:
Originally Posted by fl-mike View Post
Yes, they are still around, but I could only find 100A and 200A ones for around $25 or more each in all of Tucson.

This compares to the past when they were simply items on the rack at Home Depot, Lowes and ACE hardware.

If you are building new I would go to a smaller, and currently more popular, size fuse such as the midi one listed earlier.

If you have ANL fues installed in your RV, then go to your local West Marine store (yes, they have them in AZ, but no 50A stock in all of Phoenix) or order on-line and have one or two in hand in your hangar.
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  #28  
Old 09-26-2017, 03:17 PM
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skylor skylor is offline
 
Join Date: Aug 2009
Location: Southern California
Posts: 882
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Quote:
Originally Posted by az_gila View Post
Yes, they are still around, but I could only find 100A and 200A ones for around $25 or more each in all of Tucson.

This compares to the past when they were simply items on the rack at Home Depot, Lowes and ACE hardware.

If you are building new I would go to a smaller, and currently more popular, size fuse such as the midi one listed earlier.

If you have ANL fues installed in your RV, then go to your local West Marine store (yes, they have them in AZ, but no 50A stock in all of Phoenix) or order on-line and have one or two in hand in your hangar.
Did you try B&C Specialties?

http://www.bandc.aero/anlcurrentlimi...rough130a.aspx
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  #29  
Old 09-26-2017, 04:00 PM
ron sterba ron sterba is offline
 
Join Date: May 2007
Location: salem Oregon
Posts: 1,023
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Skylor I did purchase both the holder and fuse at B & C. THEY ARE ON THERE WAY BY WAY OF THE FASTEST DELIVERY UNITED STATES POSTAL SERVICE.
RON IN oregon RV9A
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  #30  
Old 09-26-2017, 04:12 PM
rv7charlie rv7charlie is offline
 
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
Default Fat Wires

John,

I confess; I didn't copy & paste the entire book. :-)

As (I thought) someone had already pointed out, bus feeders are protected by their contactors, and fusing them adds failure points.
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