benjamin.f8
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Extending the PSU cables.

Tue Jun 12, 2018 2:24 am

I've finally got my MK3 into my Lack enclosure! And the PSU cables are too short. :| Not the twisted black and white one, just the reds and blacks. Not a problem, I can extend them, but what gauge are they? I'd rather not be stupid by doing the wires too small.

BEST ANSWER by joan.t » Tue Jun 12, 2018 2:34 pm
Hi Benjamin,

I would provide new wires rather than extend the existing wires.

I am an advocate for using quality flexible wires and like to use silicone insulated flexible wires

below is a table of the current carrying capability for various gauges.
Wire table.JPG
as the power supply is rated at 24 volts 10 amps,

16 AWG should be adequate for the power cables. because :
A, the ratings displayed, have safety allowances built in, and
B, the 16AWG cable is rated over twice the expected power requirement

don't forget to use the correct terminals for the ends!

regards Joan

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joan.t
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Re: Extending the PSU cables.

Tue Jun 12, 2018 2:34 pm

Hi Benjamin,

I would provide new wires rather than extend the existing wires.

I am an advocate for using quality flexible wires and like to use silicone insulated flexible wires

below is a table of the current carrying capability for various gauges.
Wire table.JPG
Wire table.JPG (91.75 KiB) Viewed 200 times
as the power supply is rated at 24 volts 10 amps,

16 AWG should be adequate for the power cables. because :
A, the ratings displayed, have safety allowances built in, and
B, the 16AWG cable is rated over twice the expected power requirement

don't forget to use the correct terminals for the ends!

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

benjamin.f8
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Re: Extending the PSU cables.

Tue Jun 12, 2018 3:36 pm

Thank you very much for your thorough reply. :D

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joan.t
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Re: Extending the PSU cables.

Tue Jun 12, 2018 4:14 pm

Thank you Benjamin.
I usually get this wire off Ebay. It is used for radio controll models. May I suggest that you get perhaps an extra metre of each colour. So that wnen the heat bed cable breaks. You will have stock on hand.
Same cable size.
Regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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david.f42
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Re: Extending the PSU cables.

Wed Jun 13, 2018 4:03 am

joan.t wrote:
Tue Jun 12, 2018 4:14 pm
Thank you Benjamin.
I usually get this wire off Ebay. It is used for radio controll models. May I suggest that you get perhaps an extra metre of each colour. So that wnen the heat bed cable breaks. You will have stock on hand.
Same cable size.
Regards Joan
Is it common for the heat bed cable to break?

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joan.t
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Re: Extending the PSU cables.

Wed Jun 13, 2018 8:34 am

Hi David,

it's happened to me twice, with original prusa cables, so far this has not happened with silicone cables.

there have been a number of similar issues on the forum...

I notice the leads on my mk2.5 heatbed now fasten with nuts and bolts, is this to make them easier to replace?


regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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david.f42
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Re: Extending the PSU cables.

Thu Jun 14, 2018 10:19 pm

Thanks! I ordered this off amazon: https://www.amazon.com/gp/product/B07BK ... UTF8&psc=1
75 feet for $10. Seems reasonable, I guess.

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joan.t
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Re: Extending the PSU cables.

Thu Jun 14, 2018 10:24 pm

That looks good, David,

regards Joan
I try to make suggestions that I believe to be well founded and safe,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions,
what you do, is YOUR responsibility.

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