X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 5.1.0) with ESMTP id 1480288 for flyrotary@lancaironline.net; Tue, 17 Oct 2006 00:44:05 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=alventures@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao10.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20061017044339.QDZE18985.fed1rmmtao10.cox.net@fed1rmimpo02.cox.net> for ; Tue, 17 Oct 2006 00:43:39 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo02.cox.net with bizsmtp id bGjj1V0081xAn3c0000000 Tue, 17 Oct 2006 00:43:43 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: What size CB or fuses.. EC 2 items.. Date: Mon, 16 Oct 2006 21:43:41 -0700 Message-ID: <000701c6f1a6$d1d2b4f0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C6F16C.257626E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C6F16C.257626E0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable David; =20 I had a 15 amp fuse (regular, not a slow-blow) open driving 3 coils on = my 20B. It apparently happened during start. I now run 20A on the coil circuits, and 15A on the injector circuits (3 on each). 16 AWG wire. =20 Dale; =20 You may want to try a different font - for whatever reason your messages come up blank on my MS Outlook Express. I can't read them until I click = to 'reply'. =20 Al =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dale Rogers Sent: Monday, October 16, 2006 4:45 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: What size CB or fuses.. EC 2 items.. =20 Dave, I'm not saying that you've said anything incorrectly, but you did=20 leave out a fairly important factor (as well as included a factor=20 that is often overlooked: length of the wire run.) A wise person=20 sizes the wire to carry at least 20% more current than the "run"=20 load of the device(s) it supports. _Then_ size the breaker to=20 support the load *potential* of the wire, not the actual load. =20 That's how one avoids "false" breaker trips. Dale R. David Staten wrote:=20 Then let me restate the question.. whats the minimum amount of current = the device requires to function properly.. so that the fuse or breaker = doesnt blow in normal operation... I can "protect" the wire with a 1 amp = breaker just as easy as I can with a 10 amp breaker.. It makes a difference in = that I have a truckload of 5 amp breakers readily available but have to = purchase 10's or 15's.=20 Yea.,.. you say do not size the breaker according to the amp load.. only = to protect the wire run. BUT... in a proper installation, the wire is sized according to the load carried over the distance carried.. so = indirectly.. you DO size the breaker to the load (via the wire's capacity to carry current)...=20 Dave=20 =20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0008_01C6F16C.257626E0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

David;

I had a 15 amp fuse (regular, not = a slow-blow) open driving 3 coils on my 20B. It apparently happened during = start. I now run 20A on the coil circuits, and 15A on the injector circuits (3 = on each). 16 AWG wire.

Dale;

You may want to try a different = font – for whatever reason your messages come up blank on my MS Outlook = Express. I can’t read them until I click to = ‘reply’.

Al

-----Origi= nal Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dale Rogers
Sent: Monday, October 16, = 2006 4:45 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = What size CB or fuses.. EC 2 items..

Dave,

I'm not saying that you've = said anything incorrectly, but you did
leave out a fairly important factor (as = well as included a factor
that is often overlooked: length of the = wire run.) A wise person
sizes the wire to carry at least 20% more = current than the "run"
load of the device(s) it supports. = _Then_ size the breaker to
support the load *potential* of the wire, = not the actual load.
That's how one avoids "false" = breaker trips.

Dale R.

David Staten wrote:

Then let me = restate the question.. whats the minimum amount of current the device requires to = function properly.. so that the fuse or breaker doesnt blow in normal = operation... I can "protect" the wire with a 1 amp breaker just as easy as I can = with a 10 amp breaker.. It makes a difference in that I have a truckload = of 5 amp breakers readily available but have to purchase 10's or 15's.

Yea.,.. you say do not size the breaker according to the amp load.. only = to protect the wire run. BUT... in a proper installation, the wire is sized according to the load carried over the distance carried.. so = indirectly.. you DO size the breaker to the load (via the wire's capacity to carry = current)...

Dave

--

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