[Elecraft] [El

[kstover at ac0h.net]

Classic pissing contest about whose wire is better.

What is the maximum current draw for the amp?

#6 AWG copper is rated at 101 amps for chassis wiring and 37 amps for power transmission, not this case.
#6 will fit a 75 amp PP connector. (stick it in the hole squeeze it and solder it) and has a resistance per 1000 ft of 0.3951 Ohms.
Let's figure the voltage drop. 10 foot zip cable (two conductors so use 20' in the formula) 50VDC @65 amps. Voltage drop equals .26V. The amp won't even notice it. If you bump the current draw up to the PP limit of 75 amps the Vdrop is 0.30V.

#8 AWG copper is chassis rated for 73 amps and has a resistance per 1000 ft of 0.6282 Ohms.. Voltage drop = .41V

People need bigger cable because?...Use what Elecraft uses, whatever that is, and be well.

http://www.powerstream.com/Wire_Size.htm
https://www.calculator.net/voltage-drop-calculator.html 


R. Kevin Stover    AC0H

ARRL, FISTS, SKCC, NAQCC.
“If it doesn’t work the first time you push the button it won’t work the 20th…Just stop.”

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Clay Autery
Sent: Saturday, July 28, 2018 3:55 PM
To: 'Elecraft Reflector' <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] [El

See my previous post....  teim down the end to fit the 75 amp crimp terminal....  tin the step point so that all strands are soldered together...  <smile>.
In fact, I just did this today to get some #10 wire to fit a piggy- back spade connector that was for smaller wire...  (all I had) Was making a dual power pole to 1/4" quick connector adapter with piggy back male quick connect....  to use on a Bioenno battery with 1/4" quick connect spade connectors.


Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: john at kk9a.com Date: 7/28/18  14:21  (GMT-06:00) To: 'Elecraft Reflector' <elecraft at mailman.qth.net> Subject: [El The 75 amp Powerpole connector is designed for 6, 8 or 10 AWG wire so you might have problems squeezing a larger wire in.


John KK9A


[Elecraft] KPA-1500 Power Supply Cable Size
Clay Autery KY5G at montac.com 

If it uses a 75 Amp PP connector, my inclination would be to use the 
6AWG MINIMUM.  I would be tempted to use the flexible welding cable lead 
stock in the largest gauge I could fit in the application space.  I'd 
trim down the end of the conductor to JUST fit into the 75 AMP crimp 
contact.  Then, I'd tine the trimmed down end to bond ALL the conductors 
together right at the end before I crimped/soldered. Then, I'd 
crimp/solder the terminal on making sure not to be sloppy and cause a 
fitment issue.  If possible, I would put as many twists in the red/black 
leads between radio and power supply connection as possible....

I've not investigated the wiring yet, BUT, if there is a ground wire 
between the PA chassis and the PS chassis, I would integrate the ground 
wire into the power harness in a 3-wire bundle with all three wires as 
close to the same length and shinked into a single cable.

But I'm nuts...  <smile>

>
> On Sat, Jul 28, 2018 at 5:04 AM, Richard Thorne <rthorne at rthorne.net>
wrote:
>
>> What gauge wire is used for the HV line between the power supply and amp?
>> I'd like to build or source a shorter cable.
>>
>> Thanks
>>
>> Rich - N5ZC

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