X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao05.cox.net ([68.230.241.34] verified) by logan.com (CommuniGate Pro SMTP 5.1c.6) with ESMTP id 1470867 for flyrotary@lancaironline.net; Mon, 16 Oct 2006 20:45:48 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.34; envelope-from=dale.r@cox.net Received: from fed1rmimpo02.cox.net ([70.169.32.72]) by fed1rmmtao05.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20061017004525.SVXF12909.fed1rmmtao05.cox.net@fed1rmimpo02.cox.net> for ; Mon, 16 Oct 2006 20:45:25 -0400 Received: from [192.168.1.100] ([68.2.134.48]) by fed1rmimpo02.cox.net with bizsmtp id bClU1V01312ovmC0000000 Mon, 16 Oct 2006 20:45:28 -0400 Message-ID: <45342797.9060707@cox.net> Date: Mon, 16 Oct 2006 17:45:11 -0700 From: Dale Rogers Reply-To: dale.r@cox.net User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: What size CB or fuses.. EC 2 items.. References: In-Reply-To: Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit 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