Return-Path: Received: from falk.c2i.net ([193.216.69.98]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 25 Jan 2000 17:54:34 -0500 Received: from oemcomputer (mp-217-217-158.daxnet.no [193.217.217.158]) by falk.c2i.net (8.9.3/8.9.3) with SMTP id XAA14364 for ; Tue, 25 Jan 2000 23:50:35 +0100 (MET) Message-ID: <000c01bf6788$d74ca1c0$9ed9d9c1@oemcomputer> From: "Roy" To: References: <20000125051143.AAA20759@truman.olsusa.com> Subject: Re:Sizing of breakers/fuses Date: Wed, 26 Jan 2000 00:06:21 +0100 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Hi Ed and all: How to find ratings for breakers/fuses: Ohm's law: U=R x I or P=U x I U= Voltage R= Resistance I = Amps P= Watt If we use your landing light as an example: 12volt and 100 watts: P / U = I = 100 / 12 = 8.33 amps. Its normal to "over fuse" by ca. 10%. 8,33A + 10%= 9.17A = closest available fuse = 10A or, lets say you have a electric heated seat, and all you know is that it operates on 12V: Measure resistance, lets say 0.9ohms: U / R = I = 12 / 0.9 = 13.33A + 10%= 14.67A = closest available fuse= 15A. You could also tell that the heating element is 160 watts : P=U x I = 12 x 13.33 = 159.96W. If you know the length of a wire and the amps running trough it, its easy to find what cable thickness to use. My system of finding cable thickness is in mm2. (I don't understand the "gauge" system) If it's of interest and somebody could supply me with a conversion table (?gauge to ?mm2), I can convert my table and post it on LML. Regards Roy Valvik Norway >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>