Who's on first Sam kf4yox Sent from my iPhone
On Apr 2, 2011, at 10:19 AM, Don Wilhelm <[email protected]> wrote: > Where will the current will flow if there is a fault? That is the > question. > > There are two things involved here - wiring the radio negative directly > to the battery or wiring it to the vehicle chassis. It does make a > difference because of the way most vehicle batteries are tied on the > negative terminal. > > If one wires both positive and negative directly to the battery, the > negative should be fused to protect the RADIO in case of a fault between > the battery and the engine block. It is not a safety issue. > > Note carefully that the battery negative is wired both to the engine > block and to the chassis by direct wires from the battery negative. If > the battery were tied only to the engine block and then the chassis were > also tied to the engine block (as was pointed out in the case of the > boat), the failure mode would not exist. > And it is all because the radio is grounded to the chassis through the > antenna connection in addition to the negative lead. If both these > grounds go to the chassis instead of the battery negative, the problem > solved by the fuse in the negative lead would not exist. > > If the radio negative is connected to the vehicle chassis, the problem > does not exist and the negative lead should NOT be fused. > > 73, > Don W3FPR > > On 4/2/2011 9:40 AM, David Ferrington, M0XDF wrote: >> I'm not positive (forgive the pun), but I think ideas have changed on that >> in the UK and you again don't fuse the -ve lead, but I'll need to check. >> 73 de M0XDF, K3 #174, P3 #108 > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
