X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2570748 for flyrotary@lancaironline.net; Fri, 07 Dec 2007 09:27:16 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=alventures@cox.net Received: from fed1rmimpo03.cox.net ([70.169.32.75]) by fed1rmmtao103.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20071207142636.SSRM21007.fed1rmmtao103.cox.net@fed1rmimpo03.cox.net> for ; Fri, 7 Dec 2007 09:26:36 -0500 Received: from BigAl ([72.192.143.193]) by fed1rmimpo03.cox.net with bizsmtp id MqSa1Y0014AaN600000000; Fri, 07 Dec 2007 09:26:34 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: circuit breakers Date: Fri, 7 Dec 2007 06:26:53 -0800 Message-ID: <001701c838dd$36a526a0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01C8389A.2881E6A0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0018_01C8389A.2881E6A0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Bob; =20 My assumption is that the circuits coming off the bus are all protected = near the bus; so putting protection on the feed wire near the bus doesn't = protect anything. But I guess the discussion doesn't mean much without a larger context. =20 Al G =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bobperk90658@bellsouth.net Sent: Thursday, December 06, 2007 10:41 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: circuit breakers =20 =20 Sorry that I didn't make my thoughts clear. My thinking is that the = cable is just an extension of the positive terminal of the battery. If there is no possibility of the wiring shorting out to ground, (This = could be what if'this to death) you can protect for the maximum amount of = current your cable can conduct. If there is any possibility that the cable = could be shorted to ground then, yes protect at the source. I would think = that a plastic plane with the positive cable in an isolated raceway would = present itself as a good candidate for the first scenario. A switched = disconnect could be inserted at the battery and remotely and manually opened for a = fill good safety feature . In any instillation you have a certain amount of unprotected wiring between the battery and the buss, this only extends = that length. In my mind the cable is just an extension of the positive battery = terminal, especially if the cable is sized large enough to carry the entire load = plus 100%. This may go contrary to national wiring code but if you want = control of the operation from the pilot seat then this is what is needed. =20 Bob Perkinson =20 Bob Perkinson =20 -------------- Original message from "Al Gietzen" : --------------=20 If you want to protect the wiring from the battery to the buss place a = fuse or CB close to the buss. =20 =20 Bob Perkinson =20 Bob;=20 Not sure I understand that. The protection of the wire should be near = the source, not at the far end. =20 Al ------=_NextPart_000_0018_01C8389A.2881E6A0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Bob;

 

My assumption is that the = circuits coming off the bus are all protected near the bus; so putting protection = on the feed wire near the bus doesn’t protect anything.  But I guess = the discussion doesn’t mean much without a larger = context.

 

Al G

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bobperk90658@bellsouth.net
Sent: Thursday, December = 06, 2007 10:41 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = circuit breakers

 

 

Sorry that I didn’t make my thoughts clear.  My thinking is that the cable is just an extension of the = positive terminal of the battery.

If there is no possibility of the = wiring shorting out to ground, (This could be what if’this to death) you = can protect for the maximum amount of current your cable can conduct.    If there is any possibility that = the cable could be shorted to ground then, yes protect at the source.  I = would think that a plastic plane with the positive cable in an isolated raceway = would present itself as a good candidate for the first scenario.  A = switched disconnect could be inserted at the battery and remotely and manually = opened for a fill good safety feature .   In any instillation you = have a certain amount of unprotected wiring between the battery and the buss, = this only extends that length.

In my mind the cable is just an extension of = the positive battery terminal, especially if the cable is sized large enough = to carry the entire load plus 100%.  This may go contrary to national = wiring code but if you want control of the operation from the pilot seat then = this is what is needed.

 

Bob Perkinson

 

Bob Perkinson

 

-------------- Original message from "Al Gietzen" <ALVentures@cox.net>: --------------


If you = want to protect the wiring from the battery to the buss place a fuse or CB close = to the buss. 

 

Bob Perkinson

 

Bob;

Not sure I understand that.  The protection of the wire should be near = the source, not at the far end.

 

Al

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