From the Powerpole spec sheet.

Avg. Mated Contact Resistance   |   Milliohms

15A Wire Contact with 5/8” of #16 AWG   |   0.875
30A Wire Contact with 5/8” of #12 AWG   |   0.600
45A Wire Contact with 5/8” of #10 AWG   |   0.525
45A PCB Contact to Contact   |   0.500
25A PCB Contact to Contact   |   0.600

Page 26: 
https://www.andersonpower.com/_global-assets/downloads/pdf/ds-pp1545.pdf

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Apr 16, 2018, at 4:17 PM, Don Wilhelm <donw...@embarqmail.com> wrote:
> 
> Using a fused Rigrunner to connect from the K3 to a power supply can cause 
> excessive voltage drop.  There are 6 points of contact.  The APP contact to 
> the rigrunner itself (2 contacts, the negative must be considered as well).  
> There are 2 at the fuse contacts, and there are 2 at the the cable connecting 
> the output of the Rigrunner.  Add an additional 2 for the connection to the 
> K3 - that makes a total of 8.
> If you consider a 1mohm contact resistance (a practical estimate), then you 
> have an 0.008 ohm resistance between the power supply and the K3.
> At 17 amps current draw for a K3 at 100 watts, the expected IR drop with that 
> configuration is 0.136 volts due to contact resistance alone.
> Add to that the resistance of the wire (#12 wire at 20 degC of 1.558 ohms per 
> 1000 ft.), you have an additional 3.116 milliohms resistance in a 5 foot 
> cable of #12 wire - for a total of  over 1.0 volts from the #12 wire.
> 
> In other words, the total contact resistance of the 8 powerpole connectors is 
> not as great as the resistance of  5 feet of #12 wire.
> 
> Yes, connect the the K3/K3S directly to the power supply for best results, 
> but if you connect through  a Rigrunner,, expect some added voltage drop.
> 
> The voltage drop through properly assembled APP connectors is low but not 
> zero.
> 
> 73,
> Don W3FPR
> 
> On 4/16/2018 4:51 PM, Joe Subich, W4TV wrote:
>> On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
>>> So 4 sets of power pole connectors plus 2 fuses.
>> Even if the power pole connectors are assembled perfectly and
>> mated with optimum tension, the resistance in just the four
>> (15 A) power pole connectors in the negative lead is equivalent
>> to nearly 40 feet of #12 copper wire!
>>> The voltage at the rig, K3, now drops a volt when putting out 100
>>> Watts.
>> With the equivalent of 50 feet of power cable (4 connectors plus a
>> 10 foot physical cable), I would not be surprised.  Assuming 20A
>> in transmit (on 15A power poles!), a 1V drop represents 0.05 Ohms
>> of total circuit losses .... that's pretty good for 10 feet (x2)
>> of cable plus eight connectors (4 in the + lead, 4 in the - lead)
>> and the switching device (probably a Schotkey diode).  However,
>> the 0.05 Ohms in the negative lead is probably ten times higher
>> than in a braided bonding connection directly from the K3 chassis
>> to the power supply chassis.
>> I'm surprised that only 75% went through the ground path - that
>> indicates the ground path has 1/3 as much resistance as the "right"
>> (V- lead) path.
>> 73,
>>    ... Joe, W4TV
>> On 2018-04-16 4:26 PM, hawley, charles j jr wrote:
>>> About 75% went thru the ground path. The 10 ga to the rig went from Astron 
>>> to a battery switching device in case of power outage, to rig runner and to 
>>> rig. So 4 sets of power pole connectors plus 2 fuses. I’m thinking of 
>>> changing some of that too. The voltage at the rig, K3, now drops a volt 
>>> when putting out 100 Watts.
>>> 
>>> Chuck Jack
>>> KE9UW
>>> 
>>> Sent from my iPhone, cjack
>>> 
>>>> On Apr 16, 2018, at 3:14 PM, Wes Stewart <wes_n...@triconet.org> wrote:
>>>> 
>>>> I would hope that "much of the current..." wasn't really much.  The direct 
>>>> conductor from the negative terminal of the power supply to the radio 
>>>> should carry the majority of the supply current,
>>>> 
>>>> Wes  N7WS
>>>> 
>>>>>   On 4/15/2018 7:38 PM, hawley, charles j jr wrote:
>>>>> This thread prompted me to check out my Astron vs35m. It had a small 
>>>>> black wire from -V connected to the bottom of the chassis. Perhaps it 
>>>>> could be called a case or cabinet...more importantly, it’s what the green 
>>>>> wire from the line cord is connected to. I disconnected the black wire. 
>>>>> When it was connected, much of the current that would have passed thru 
>>>>> the negative power wire from the power supply to the rig was shunted thru 
>>>>> the green power cord wire, the ground buss bar, and other ground 
>>>>> connections.
>>>>> 
>>>>> Chuck Jack
>>>>> KE9UW
>>>>> 
>>>> 
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