X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost02.isp.att.net ([207.115.11.52] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2570264 for flyrotary@lancaironline.net; Fri, 07 Dec 2007 01:41:32 -0500 Received-SPF: pass receiver=logan.com; client-ip=207.115.11.52; envelope-from=bobperk90658@bellsouth.net Received: from fwebmail02.isp.att.net ([207.115.11.152]) by isp.att.net (frfwmhc02) with SMTP id <20071207064052H0200afj4ue>; Fri, 7 Dec 2007 06:40:52 +0000 X-Originating-IP: [207.115.11.152] Received: from [74.249.251.67] by fwebmail02.isp.att.net; Fri, 07 Dec 2007 06:40:52 +0000 From: bobperk90658@bellsouth.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: circuit breakers Date: Fri, 07 Dec 2007 06:40:52 +0000 Message-Id: <120720070640.18494.4758EAF40000DAE30000483E22216125569B0A02D2089B9A019C04040A0DBFC7059D0A9F0D010D@att.net> X-Mailer: AT&T Message Center Version 1 (Oct 30 2007) X-Authenticated-Sender: Ym9icGVyazlAYmVsbHNvdXRoLm5ldA== MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_18494_1197009652_0" --NextPart_Webmail_9m3u9jl4l_18494_1197009652_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit 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" : -------------- 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 --NextPart_Webmail_9m3u9jl4l_18494_1197009652_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

 

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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