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G2BGI > POWER 03.07.03 18:24l 32 Lines 1163 Bytes #999 (0) @ WW
BID : 34445_GB7RMS
Read: DB0FHN GUEST OE7FMI
Subj: Re: why fuse -ve ?
Path: DB0FHN<DB0RGB<OK0PPL<RZ6HXA<SP7MGD<SR3BGN<WB0TAX<GB7ESX<GB7RMS
Sent: 030703/0542Z @:GB7RMS.#34.GBR.EU #:34445 [Folkestone] FBB7.00g25
From: G2BGI@GB7RMS.#34.GBR.EU
To : POWER@WW
> Indeed the reason for 2 fuses, 1 each in both the positive and negative
> lead is important in systems where other high current devices are used
> ,like motor vehicles and boats. This to prevent that in the event of a
> earth/wiring fault a excessively high current would flow through the leads
> to the radio.
> In a domestic situation with a dedicated power supply for the radio(s) , a
> single fuse in the (usually) positive lead is sufficient.
>
> 73 - Frank , GM0CSZ @ GB7NOS.#76.GBR.EU
> Inver by Tain , IV20 1RX Scotland UK Loc: IO87AT
Very well stated Frank, I had a radio and linear installed in one of my
cars and the linear earth became lose. Causing smoke to be emitted from
my radio, as there was not a fuse in the earth line of the radio and the
radio could not handle the return current. Nice toasted RF chokes at the
radios power socket on the negative rail!
73 - Dominic, G2BGI @ GB7RMS
Message timed: 05:29 on 2003-Jul-03
Message sent using WinPack-Telnet V6.80
73 - Dominic, G2BGI @ GB7RMS
Message timed: 05:29 on 2003-Jul-03
Message sent using WinPack-Telnet V6.80
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