X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf19aec.mail.bellsouth.net ([205.152.59.67] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 951085 for flyrotary@lancaironline.net; Fri, 20 May 2005 12:21:44 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.67; envelope-from=sladerj@bellsouth.net Received: from ibm60aec.bellsouth.net ([65.2.89.207]) by imf19aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050520162059.UHXV2061.imf19aec.mail.bellsouth.net@ibm60aec.bellsouth.net> for ; Fri, 20 May 2005 12:20:59 -0400 Received: from JSLADE ([65.2.89.207]) by ibm60aec.bellsouth.net (InterMail vG.1.02.00.01 201-2136-104-101-20040929) with ESMTP id <20050520162058.SGSD11146.ibm60aec.bellsouth.net@JSLADE> for ; Fri, 20 May 2005 12:20:58 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: More MAP measurement questions Date: Fri, 20 May 2005 12:20:55 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003C_01C55D36.5F432420" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_003C_01C55D36.5F432420 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Why are they at different potentials? Are you using a single point grounding scheme? Joe. I don't think there's such a thing as a true single point grounding. Every wire from a component to the ground is a different length and resistance, so there WILL be differences. I have two grounds - one at the firewall close to the batteries, and one at the panel. They're connected by 14G wire. All the EC2 shielded wires are connected to the EC2 ground. John ------=_NextPart_000_003C_01C55D36.5F432420 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
Why are they at different potentials?  Are you using a single = point=20 grounding scheme? 
Joe. I=20 don't think there's such a thing as a true single point = grounding.=20 Every wire from a component to the ground is a different length and = resistance,=20 so there WILL be differences. I have two grounds - one at the firewall = close to=20 the batteries, and one at the panel. They're connected by 14G wire. All = the EC2=20 shielded wires are connected to the EC2 ground.
John 
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