X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.248] (HELO qnsi-xch.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2570754 for flyrotary@lancaironline.net; Fri, 07 Dec 2007 09:28:29 -0500 Received-SPF: none receiver=logan.com; client-ip=66.219.56.248; envelope-from=bhughes@qnsi.net Content-class: urn:content-classes:message Return-Receipt-To: "Bobby J. Hughes" MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C838DD.4F44F50A" Disposition-Notification-To: "Bobby J. Hughes" X-MimeOLE: Produced By Microsoft Exchange V6.5.6944.0 Subject: RE: [FlyRotary] Re: circuit breakers Date: Fri, 7 Dec 2007 08:27:33 -0600 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: circuit breakers Thread-Index: Acg4nDNOdayiTg9ESlS7kPlTZnTavQAQKZ0g From: "Bobby J. Hughes" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C838DD.4F44F50A Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable "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" =20 =20 Bob, =20 You should always run positive and negative wires in pairs and if possible twisted pairs. If twisted is not possible then the wires should lay side by side as much as possible. Isolating a large load cable is asking for EMI.=20 =20 Bobby ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bobperk90658@bellsouth.net Sent: Friday, December 07, 2007 12:41 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: circuit breakers =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 -------------- Original message from "Al Gietzen" : --------------=20 =09 =09 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_001_01C838DD.4F44F50A Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

"I = would think=20 that a plastic plane with the positive cable in an isolated raceway = would=20 present itself as a good candidate for the first scenario"

Bob,

You should always run positive and negative = wires in=20 pairs and if possible twisted pairs. If twisted is not possible then the = wires=20 should lay side by side as much as possible. Isolating a large load = cable is=20 asking for EMI.

Bobby

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of=20 bobperk90658@bellsouth.net
Sent: Friday, December 07, 2007 = 12:41=20 AM
To: Rotary motors in aircraft
Subject: = [FlyRotary] Re:=20 circuit breakers

Sorry that I = didn’t make my=20 thoughts clear. My = thinking is that=20 the cable is just an extension of the positive terminal of the = battery.

If there is no = possibility=20 of the wiring shorting out to ground, (This could be what if’this = to death) you=20 can protect for the maximum amount of current your cable can = conduct. If there is = any=20 possibility that the cable could be shorted to ground then, yes protect = at the=20 source. I would think = that a=20 plastic plane with the positive cable in an isolated raceway would = present=20 itself as a good candidate for the first scenario. A switched disconnect could be = inserted=20 at the battery and remotely and manually opened for a fill good safety = feature=20 . In any = instillation you=20 have a certain amount of unprotected wiring between the battery and the = buss,=20 this only extends that length.

In my mind the = cable is=20 just an extension of the positive battery terminal, especially if the = cable is=20 sized large enough to carry the entire load plus 100%. This may go contrary to = national wiring=20 code but if you want control of the operation from the pilot seat then = this is=20 what is needed.

Bob Perkinson

--------------=20 Original message from "Al Gietzen" <ALVentures@cox.net>: = --------------=20

If you=20 want to protect the wiring from the battery to the buss place a fuse = or CB=20 close to the buss.

Bob = Perkinson

Bob;=20

Not sure = I=20 understand that. The protection of the wire should be near the = source,=20 not at the far end.

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