Longer power cables?  

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io7m
 io7m
(@io7m)
Active Member

Hello!

Apologies for the possibly dumb question. I've gotten hold of an enclosure for my relatively new MK3S (assembled from the kit). It has a section on the side to mount the printer's power supply so that it can sit in the cooler air outside of the enclosure. The problem I have is that the power cables (the black and red cables with the spade connectors) are only long enough to mount the power supply on the printer frame; there's no extra length in the cables to put the power supply anywhere else.

I need to source some replacement longer cables, but I don't really know what I need to be looking for. Can anyone advise on cables? I'm in the UK, if that changes anything.

Posted : 19/10/2020 6:02 pm
jsw
 jsw
(@jsw)
Noble Member

I would suggest automotive wire of the appropriate gauge as the most readily available.  That's what I planned to use before I got the enclosure with the side vent that directs room air into the power supply.

For model railroading, that's what we mostly use for low-voltage moderate-amperage wiring.

This post was modified 1 month ago by jsw
Posted : 19/10/2020 8:03 pm
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 -2
(@-2)
Illustrious Member

Make sure you aren't buying copper clad aluminum, which seems to a thing these days. I prefer more flexible wire (more strands), that is tin plated (to reduce oxidation failure down the road).  I'd go with marine grade - but automotive high temp will work (marine usually exceeds specs).

10 amps is about what the printer uses, and 14 awg is marginal if you extend things tens of feet. 

It is always wise to get more than one opinion... as for trusting Prusa? No way man....
Posted : 19/10/2020 8:25 pm
karl-herbert
(@karl-herbert)
Famed Member
Posted by: @io7m

Hello!

Apologies for the possibly dumb question. I've gotten hold of an enclosure for my relatively new MK3S (assembled from the kit). It has a section on the side to mount the printer's power supply so that it can sit in the cooler air outside of the enclosure. The problem I have is that the power cables (the black and red cables with the spade connectors) are only long enough to mount the power supply on the printer frame; there's no extra length in the cables to put the power supply anywhere else.

I need to source some replacement longer cables, but I don't really know what I need to be looking for. Can anyone advise on cables? I'm in the UK, if that changes anything.

I would reassemble (not extend) all cables from the PSU to the Einsy board and make sure that the cross-section is not too small. After all, currents of up to 10 amperes flow. The larger the cross section, the lower the voltage drop.

You probably also want to use connectors like these or similar to lead the wires into the enclosure:

...and don't forget the powerpanic wires (black/white).

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 19/10/2020 8:43 pm
karl-herbert
(@karl-herbert)
Famed Member

Addition: I have used flexible silicone cable like this for most applications on the printer:

https://www.amazon.co.uk/TUOFENG-Electrical-Flexible-Different-Electronics/dp/B07G712DY4

of course with the right cross section.

 

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 19/10/2020 8:51 pm
karl-herbert
(@karl-herbert)
Famed Member

https://grealpha.com/resources/dc-load-wiring-calculator/

14 to 15AWG would be appropriate.

 
Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 19/10/2020 8:58 pm
cwbullet
(@cwbullet)
Famed Member

@karl-herbert

This what I used and a standard JST for the power panic.  

Posted : 20/10/2020 12:32 am
io7m
 io7m
(@io7m)
Active Member

Thanks, all! Think I have enough to go on. 👍 

Posted : 20/10/2020 10:27 am
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