Setup Questions - Whatsminer M32 54TH

[shitmexanon]

I have a Whatsminer M32-54TH miner arriving soon. I couldn't find a spec sheet on this specific machine but did find a Whatsminer M32-68T spec sheet which was as close as I could find here: https://whatsminer.com/mall/parts/41.html
Anyone know where I can find a spec sheet for this specific machine?


Given the spec sheet showing 3312W +/- 10% I calculate a maximum wattage of 3643W.
Given the spec sheet showing P21D AC200V~277V, and using the 3643W from before, I did 3643W/200V=18.216amps

My understanding is that I shouldn't draw more than 80% of the rated amperage on the breaker, so a double pole 30 amp breaker seems necessary.

I need to run about 40 feet (12 meters) of wiring to an outlet that will be installed for the miner. Using an AWG chart I estimate I will need to use an 8 guage wire for this length. Do I need to make any extra considerations given how long this cable is?

As for the power plug for the miner, the spec sheet shows it need a C19 connector. I am unclear what type of plug to use. Here is the NEMA plug charthttps://www.stayonline.com/product-resources/nema-straight-blade-reference-chart.asp
Do I need the NEMA 7-30 to support 277V and 30amps or would the NEMA 6-20 supporting 250V and 20amps suffice? Does the cable abide by that same 80% rule I referenced earlier, or does that only apply to the breaker? In the case it only applies to the breaker, would I then need the NEMA 7-20 supporting 277V and 20amps? I'm not opposed to making this cable if I need to (I'd prefer to buy it) but I just am unclear on what I need.

Please let me know if these calculations are reasonable and provide any insight. Thank you.

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[NotFuzzyWarm]

The 80% rule applies to all wiring and connectors as well as fuses/breakers.

As for NEMA-7 vs NEMA-6, what is your measured line voltage? If not over 250 the NEMA-6 is perfect. 8ga wire is fine for just 40feet.

[shitmexanon]

Thank you for the clarity on the 80% rule.

My measured line voltage is the standard USA residential voltage, 2 legs each with 120V. Of course the miner would run off a plug connected to the 40ft of 8ga wire which is configured for 240V. In this case, since not over 250V, NEMA-6 still ok, or does the 80% rule apply to voltage as well?

[NotFuzzyWarm]

No. When it comes to wiring the 80% rule applies only to the current ratings. Voltage de-rating (along with current) really only comes into play for electronic components such as capacitors, diodes, transistors, etc. and that is a whole different animal that depend on a myriad of operating conditions.

The reason is that it is the amount of current flow (amps) through a conductor or device such as plugs, fuses & breakers - not voltage level applied - that creates heat.
I should add that if using wire with TF UF insluation (140-F max temp) and copper wire then technically 10ga wire is fine as my guides say it can carry 30A. Of course 8ga (good for 40A) is better as it will heat up far less. For the cord between the miner and outlet you can use a 10ga one.

Using wire rated for 167-F such as RHW, THHW, THWN or THW then 10 ga copper is rated to carry 35A when it is 3 wires in a cable or conduit.

[shitmexanon]

Ok thank you for that voltage insight.

Since I posted I have actually changed the miner I will be purchasing (AvalonMiner 1166 Pro) to one with the following power specs: 3400W, -5%~+8%@Wall-Plug

You mentioned that 8ga will be better than 10ga for the connection between the socket and the breaker, but that 10ga is ok for the plug between the socket and the miner. How come 10ga is ok here? Is it simply because the length of he cable here (3-6ft) is significantly shorter than the cable from the socket to the breaker (~40-50ft)?

I am trying to determine how to go about building or purchasing this power cable (between socket and miner). I know the miner requires a c19 connector. Do you or anyone else have recommendations on where to purchase these, and if so, which one? I see NEMA 6-20P cables available but not any NEMA 6-30P. Do people generally go with 6-20 or is 6-30 overkill here? I have not been able to find much content/guides on anyone building these cables themselves. Thank you.

[NotFuzzyWarm]

You mentioned that 8ga will be better than 10ga for the connection between the socket and the breaker, but that 10ga is ok for the plug between the socket and the miner. How come 10ga is ok here? Is it simply because the length of the cable here (3-6ft) is significantly shorter than the cable from the socket to the breaker (~40-50ft)?

Bingo. Yes it is only because a cord is usually fairly short. I use www.stayonline.com for all my power cords. They have a huge selection of standard cords usually in-stock and will also make any type of cord you want.

[shitmexanon]

I see NEMA 6-20 but they only go as low as 12ga. Can't seem to find any of these power cables online with 10ga. Is it just common practice that with a 8ft power cable that 12ga is acceptable?

[NotFuzzyWarm]

12 ga will work fine. It will get a little warm but be good.

[shitmexanon]

Any advantage to something like NEMA L6-20P vs the regular NEMA 6-20P?

[NotFuzzyWarm]

L means it is a twist-lock plug. Only needed if there is a concern with a cord being accidentally pulled out.

[shitmexanon]

odd question but I may have a period of time between when I get a new 240v outlet installed for my miner and when I receive possession of the miner. Since time is money with this I would like it online ASAP. I do currently have a NEMA 6-30R currently installed (for a wall AC unit) that I wold in theory use in the meantime. I can't seem to find any sort of 6-30P -> C19 plugs. I am unclear if that is because electronics with C19 aren't rated for that high amps or if there is an actual risk for   devices with C19 to run over wires that support 30amps. Does it make any sense for me to make my own C19 -> 6-30P cable? Or is this just a risk to fry my machine?

[NotFuzzyWarm]

Just make your own. Yes it technically violates code but certainly will not harm the miner.

[philipma1957]

Just make your own. Yes it technically violates code but certainly will not harm the miner.

I made a lot of them.

I think I have a link for some premade.

Maybe dell.

give me a minute or two.

found an ebay link

www.ebay.com/itm/121181887649

these used to be 10-12 bucks.

I made 5 or 6 of them.

And i purchased 15 and they are work well.

[shitmexanon]

ah that looks like the L6-30 if I understand correctly. I should specify my existing outlet is the non locking version and the corresponding plug looks like this one: http://www.yunhuanelectric.com/Clkj_Images/upfile/Bigpic/heavy-duty-power-cord-nema-6-30p.jpg

Any idea if a plug like that (the one I linked) to a C19 is also something sold or makable?

[NotFuzzyWarm]

You can always get the 6-30P from Home Depot, Lowes, or whatever you have for home improvement stores in your area and replace the end of a C19 cable. In the US there is also McMaster carr https://www.mcmaster.com/6-30-plugs?SrchEntryWebPart_InpBox=6-30p

[shitmexanon]

I'll probably go pick up something like this NEMA 6-30 cord:

https://www.homedepot.com/p/10-ft-STW-10-3-30-Amp-250-Volt-Heavy-Duty-Industral-NEMA-6-30-Extension-Cord-60653/316677060

as well as this c19 cord

https://www.amazon.com/Tripp-Lite-IEC-320-C19-IEC-320-C20-P036-006/dp/B001348EDC/ref=sr_1_4?dchild=1&dd=_8lukwCHumc2UugKtjoz1w%2C%2C&ddc_refnmnt=free&keywords=c19%2Bcable%2Bnema%2B6&qid=1619555483&refinements=p_101%3A19346685011&rnid=19346684011&s=electronics&sr=1-4&th=1

So I can hack off the receiving end of the NEMA 6-30 and the c20 end of the other cable, strip the wires on both, then properly connect into 1 new cable? Hope theres some janky youtube videos on this

[philipma1957]

this would be easy to adapt

https://www.ebay.com/itm/193645562724?

[shitmexanon]

given the essence of time, I will be getting the amazon linked cable (c19) and will hope my local hardware store has the 6-30 cable. No one seems to sell just the 6-30 plug thats not the locking type. Any idea if the two wires linked are safe to connect to one another? One is 10 awg (the NEMA 6-30 cable) and the C19 cable is 12 awg.

[NotFuzzyWarm]

Bigger question is do you know how to properly splice the wires together?...
Do NOT use crimp splices - they do not give a stable connection at high current and will eventually deteriorate. Best way is to solder them together and insulate with heat shrink tubing & tape.

Personally I'd get the C20 cable from Amazon and just a 6-30P plug from Home Depot or McMaster, cut the male plug off the C20 cable and put the 6-30P connector onto the cable. That is the best and safest way to do it.. While not a 'legal' cord because the source end (male 6-30) can be plugged into a 30A outlet it would work perfect.

[shitmexanon]

I like your 6-30P to the C19 idea it is just hard to find just the 6-30P alone without it being an extension cord.

A C19 connector seems to use 3 different wires: a hot a neutral and a ground. The 6-30 as I understand it is two hots and a ground. Am I mistaken here? Which wire then would pair with which?