@MisterBill2 the first post provides photo how it looks like ... its placed on the ground.

still i prefer to have all these mess/adaptors in separate room... and if possible extend it via cable (for each adapter separate) the question would be as mentioned before ... what voltage drop per device is acceptable and what cables should be used - thats why i provided spec of each device.

 

I see a total supply current capability of 7.7 amps for the five volts supplies, and 1.7 amps for the 12 volt supplies. the 19 volt supply is rated at 3.4 amps. So #16 gage wire could work for a ten foot extension quite adequately, if all of the intermediate connections were made with no voltage drops.

And still, not one bit of explanation as to what sort of arrangement for all of those different devices being powered. Are they as organized as the photo of the power supplies we see in post #1??

 

@MisterBill2 i need for each supply separate cable.
the distance is around 10-12m (per each cable)

if all of the intermediate connections were made with no voltage drops.

what do you mean by that?

And still, not one bit of explanation as to what sort of arrangement for all of those different devices being powered. Are they as organized as the photo of the power supplies we see in post #1??

devices are properly placed in the rack.
photo #1 shows arangements of PSUs, but i will reorganize that once the cable per each psu will be extended.

 

@MisterBill2 i need for each supply separate cable.
the distance is around 10-12m (per each cable)


what do you mean by that?


devices are properly placed in the rack.
photo #1 shows arangements of PSUs, but i will reorganize that once the cable per each psu will be extended.

OK, now I am confused: " @MisterBill2 i would prefer not to go with any rack, etc.. " From that comment my gues was that the different items were not in any sort of furniture-style rack. Now I read: "devices are properly placed in the rack."

My system is in a nice furniture type of rack, about 41 inches tall. That rack sits on four castors, so the top is about46 inches above the floor. It would be simple to build a lower extension the same width and depth as my rack, and add that between the castors and the existing rack. In my case it would be 22 inches wide and 16 inches front to back. THAT would allow a compartment for all of those power supplies, with no cable extension at all. AND it would not look bad, either.
probably my earlier suggestion was not so clear.
Of course, it is also possible that the TS is unable to actually build such a structure, or still not able to visualize it.

 

@MisterBill2 its audio rack, i dont wanna mess audio components with adapters... and dont wanna have it on the side...

 

OK, I see what that is, and I have a different suggestion: Get one more shelf section, the same width and depth, but half as high, and install that at the bottom.Then you will have a much less obvious place for all of those power supplies.
AND, your arrangement does not look at all like my arrangement, which has solid sides and a glass door in the front.

 

@MisterBill2 you are forcing me to the solution that i dont wanna go with i need to get rid of these adaptors from that room ; i dont like it and i dont wanna mess my audio rack with boxes/ shelfs etc.

so ...the solution that i propose to extend cable for each adaptor - is not doable?thx

 

maybe its not doable at all....
to have 4% Vdrop on 12m .... 4mm2 cable is required which is crazy.

 

That "calculator"gives the resistance in ohms per KILOMETER! That comes out as 0.00561 ohms per meter! Of course, 4 square mm wire is quite large, although I have not worked out what gage that equates to.
BUT 1.5A x0.00561= 0.008451 volts drop per meter in each conductor. So for a 2 conductor cable ten meters long the drop is 0.1683 volts. BUT do you really want to extend that cable 12 METERS??? THAT IS MORE THAN 36 FEET!! I see a total of seven supply voltages. THAT is going to be quite a bundle of cables to be running some distance. AND, splicing each conductor pair at each end will be a total of 28 splices to be made and insulated. I suggest looking up the outside dimension of that size of cable, and then calculating the size of that bundle of seven. Then visualize dealing with that !!

 

@MisterBill2
sorry i do not understand you.

The calculator has input Distance to load (m).
no clue what are you calculations about...
I cant use 4mm2 cable -thats nonsense.

 

That "calculator"gives the resistance in ohms per KILOMETER! That comes out as 0.00561 ohms per meter! Of course, 4 square mm wire is quite large, although I have not worked out what gage that equates to.
BUT 1.5A x0.00561= 0.008451 volts drop per meter in each conductor. So for a 2 conductor cable ten meters long the drop is 0.1683 volts.

yes
your calculation is almost the same as whats in the calculator ... so no point to calculate it again....

4 mm² ≈ 11 AWG

My point here was that using 12m and 11AWG (pretty thick cable) imply 4% Voltage drop,
that was my initial point of that thread

1) what voltage drop is accepted for these device?
2) even 4% is tolerated its insanely thick cable 11AWG ...

so apparently i cant realize what i wanted or maybe i am missing something or there is other way to achieve it.

 

Considering that #12 gage cable is rated to carry 20 amps all day long, every day, I suspect that somehow the calculator is not quite right.
If you examine the cables from a power supply to whatever it powers, you may find a marking that tells the actual wire gage. THAT would allow you to know what was used for the original design.

 

@MisterBill2 the reason to find out current gauge and total length is to calculate voltage drop?

Well than i have no clue what's the working calculator wout error.

I might also messed the measurements so the total lenght is around 7m and i can concatenate using:
a) thicker (3m) ~ awg12
b) and thinner (4 m) cable ~ awg14

is the total Voltage drop Sum of the both a) and b)?
1.58+3.26 = 4.84%

Is for the electronic devices 5% acceptable voltage drop or is it possible that devices might have issue with such a drop?


a)

b)



But no clue if thats okay etc

Thanks


https://www.calculator.net/voltage-drop-calculator.html
https://www.jcalc.net/voltage-drop-calculator-as3008

 

Consider that each of the devices was designed for the minimum possible cost as the top priority, that much voltage drop should not be an issue. Consider that the 19.4 volt, 3.4 amp power supply is probably for a computer, which has it's own voltage regulators inside, and the only devices that might use more than 12 volts would be the backlight for the screen, a lower voltage should not be any problem. The splices in the extension arrangement will probably be the bigger issue.

Once again, I suggest considering the effort, time, and expense, involved with the proposed extension of the power cables.

AND I still think that it will make much more sense to add a lower level position for that cluster of supplies, with only needing to shorten the mains side cords.

 

@MisterBill2
12V devices are Amazon Echo / Tablets
19.4V is Intel Nuc PC

AND I still think that it will make much more sense to add a lower level position for that cluster of supplies, with only needing to shorten the mains side cords.

it wont look nice if the PSUs will be there or even some "box" to hide them will be there... from esthetical point of view.

some 5V devices i can buy wall socket with usb slots... so no need to extend.

The splices in the extension arrangement will probably be the bigger issue.

why do u think?

 

If you feel that you are unable to create an enclosure that would meet your appearance standards then you are certainly welcome to not follow my advice.
And if you do not feel that " The splices in the extension arrangement will probably be the bigger issue." then either you must be a master crafts-person, or not realizing what that actually involves. ( Additional comments withheld)

 

welcome to not follow my advice.

what advice? i am really lost here.

" The splices in the extension arrangement will probably be the bigger issue."

what does it involve? really i dont know ... whats hard to splice 2 tables? no clue.

 

@MisterBill2
i think the elegant solution for that might be following ...

use AWG 16 - it can sustain 13A up to 50ft.

The only issue with that wire is Voltage drop ... so solution here might be simple ... use PSU with higher voltage ie as target device is 5V ... calculate V drop .. if its with such a wire 1.3V ... use PSU 5+1.3 = 6.3V at the end u have 5V - done with "thin" wires.

I can remember that i saw for psu meanwell that u can regulate output sightly ... maybe thats the easiest way if they produce 5/12V psu with such a functionality.

thanks

 

I doubt very much that the voltage drop will be noticeable.

 

I doubt very much that the voltage drop will be noticeable.

that depends on that how endpoint devices are designed, correct? thx