X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 05 Nov 2007 09:09:39 -0500 Message-ID: X-Original-Return-Path: <5zq@cox.net> Received: from eastrmmtao103.cox.net ([68.230.240.9] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2456112 for lml@lancaironline.net; Mon, 05 Nov 2007 07:10:14 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.240.9; envelope-from=5zq@cox.net Received: from eastrmimpo02.cox.net ([68.1.16.120]) by eastrmmtao103.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071105120935.EELI27380.eastrmmtao103.cox.net@eastrmimpo02.cox.net> for ; Mon, 5 Nov 2007 07:09:35 -0500 Received: from bh1 ([72.209.225.157]) by eastrmimpo02.cox.net with bizsmtp id 909Q1Y0053QP3uo0000000; Mon, 05 Nov 2007 07:09:24 -0500 X-Original-Message-ID: <007801c81fa4$b9578f40$6401a8c0@bh1> From: "Bill & Sue" <5zq@cox.net> X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Design for Circuit Breakers & Fuses? X-Original-Date: Mon, 5 Nov 2007 07:09:32 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0075_01C81F7A.D0484ED0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 This is a multi-part message in MIME format. ------=_NextPart_000_0075_01C81F7A.D0484ED0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello Valin, On our 320 we have a few breakers and lots of fuses. The fuses free up a = lot of panel space which, as you state, is in short supply. Here's the = logic we used in determining which circuits would be protected by which = device.=20 If a circuit opens (fuse or breaker) there are two main possibilities. = The first is that there is a short circuit. This is the reason that you = put this protection in. The second is an intermittent surge or a breaker = fault. Bad things happen with unprotected shorts, fire and smoke come to = mind as well as equipment damage. Let's say that a breaker pops in = flight. Do you try an inflight reset, betting that it was an = intermittent problem and not a short? For me, the answer depends on how = bad I need that circuit. For example, if the strobe breaker popped I = would NEVER reset in flight. The advantage of having a strobe is, to = me, not worth the risk of bigger problems. If it were my primary = GPS/COM, I MIGHT consider an inflight reset depending on the situation = at the time (IFR probably yes, VFR probably no). The items that I might consider resetting inflight (damn few) went on = breakers. The items that I would not consider resetting inflight (most = of 'em) went on fuses blocks in the foot well which are pretty much = inaccessable in flight. We've been satisfied with this arrangement, it's = worked out well.=20 On our IV were planning pretty much the same thing. The only additional = consideration is this really neat fiberglass CB panel that I bought from = Starflight http://www.starflight.aero/legacy/ that can hold around 50 = breakers very compactly and off the panel. (nice job, Valin). I might = have to cut it down a bit though.=20 Bill Harrelson N5ZQ 320 1,400 hrs N6ZQ IV under construction Hello LML gang, =20 I'm looking for opinions on the use of circuit breakers and/or fuses = in our Legacy under construction. There's not a lot of panel space in = the Legacy and I'd rather not take up room on the panel with a bunch of = breakers if the benefits are marginal. I have made a remote circuit = breaker panel as a potential solution - though, I'm starting to lean = toward just remote fusing much of the circuits with a few breakers or = switch/breakers on the panel for some high load components (eg. = Hydraulic pump). I also understand there are some self resetting = electronic breakers that might be useful. =20 I'd appreciate some advice and commentary on this subject from the = community. =20 Thanks, =20 Valin Thorn =20 Legacy Texas =20 =20 ------=_NextPart_000_0075_01C81F7A.D0484ED0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hello Valin,
 
On our 320 we have a few breakers and = lots of=20 fuses. The fuses free up a lot of panel space which, as you state, is in = short=20 supply. Here's the logic we used in determining which circuits would be=20 protected by which device.
If a circuit opens (fuse or breaker) = there are two=20 main possibilities. The first is that there is a short circuit. This is = the=20 reason that you put this protection in. The second is an intermittent = surge or a=20 breaker fault. Bad things happen with unprotected shorts, fire and smoke = come to=20 mind as well as equipment damage. Let's say that a breaker pops in = flight. Do=20 you try an inflight reset, betting that it was an intermittent = problem and=20 not a short? For me, the answer depends on how bad I need that circuit. = For=20 example, if the strobe breaker popped I would NEVER reset in=20 flight.  The advantage of having a strobe is, to me, not worth the = risk of=20 bigger problems. If it were my primary GPS/COM, I MIGHT consider an=20 inflight reset depending on the situation at the time (IFR probably = yes,=20 VFR probably no).
 
The items that I might consider = resetting inflight=20 (damn few) went on breakers. The items that I would not consider = resetting=20 inflight (most of 'em) went on fuses blocks in the foot well which are = pretty=20 much inaccessable in flight. We've been satisfied with this arrangement, = it's=20 worked out well.
 
On our IV were planning pretty much the = same thing.=20 The only additional consideration is this really neat fiberglass CB = panel that I=20 bought from Starflight http://www.starflight.aero/le= gacy/ that=20 can hold around 50 breakers very compactly and off the panel. (nice job, = Valin).=20 I might have to cut it down a bit though.
 
Bill Harrelson
N5ZQ 320 1,400 hrs
N6ZQ  IV under = construction
 
 

Hello LML=20 gang,

 

I=92m looking=20 for opinions on the use of circuit breakers and/or fuses in our Legacy = under=20 construction.  There=92s not a lot of panel space in the Legacy = and I=92d=20 rather not take up room on the panel with a bunch of breakers if the = benefits=20 are marginal.  I have made a remote circuit breaker panel as a = potential=20 solution =96 though, I=92m starting to lean toward just remote fusing = much of the=20 circuits with a few breakers or switch/breakers on the panel for some = high=20 load components (eg. Hydraulic pump).  I also understand there = are some=20 self resetting electronic breakers that might be=20 useful.

 

I=92d=20 appreciate some advice and commentary on this subject from the=20 community.

 

Thanks,

 

Valin=20 Thorn

 

Legacy

Texas

 

 

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