[Elecraft] In Line Power Pole Fuses

[Dave]

Same for auto installs...  I see far too many fuses at the radio end of 
things...  Short in the power wiring, turns into your auto burning 
itself down, as that long run of power cable burns up.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 7/21/21 8:35 PM, Don Wilhelm wrote:
> Dave and all,
> 
> Placing the fuse near the power supply end is the way to do it.
> In the event of a short, the power wire can spew metal and start a fire.
> Always fuse near the power supply.  A fuse at the equipment end will 
> only protect the equipment, but will expose the wire from the power 
> supply to hazards.
> 
> 73,
> Don W3FPR
> 
> On 7/21/2021 10:43 PM, Dave wrote:
>> Hi,
>>
>> I am unsure what you are asking...  If you are asking about fuse 
>> values, I select values a bit above the max peak current I expect. For 
>> my K3 I use a 30 amp fuse.
>>
>> If you are asking about voltage drop, and want to know what the K3 
>> sees, there is a built in volt meter in the K3, (see the manual), 
>> which will show you the voltage at the K3, after all your fusing, and 
>> wiring.
>>
>> I always take my voltage readings at full output.  I try and stay 
>> within the limits Elecraft sets for voltage.  If I am running low 
>> voltage on transmit, I goose the power supply slightly, staying below 
>> the max voltage rating Elecraft recommends when not transmitting at 
>> full power.
>>
>> The fuse(s) is/are probably not going to protect my radio-- if 
>> something happens, (i.e., current draw in excess of 30 amps), the 
>> radio is probably already broken.
>>
>> I use the fuse to reduce runaway thermal effects, (read that as fire), 
>> on my power supply wiring in the event of a short to ground.  I place 
>> the fuse(s) as close to the power supply as my wiring will allow.
>>
> 
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