New Warehouse - How to wire it?

[betajuice]

I finally got a warehouse and landlord tells me I have a 150A 3-phase panel. I will attach pictures. City requires a "Certificate of Occupancy" before power delivery company will turn on power. I don't think the current panel wiring will work and needs a modification, I'm guessing this has to be done before the permit. Well, I'm new at this and not familiar with panel standards, hoping someone here can help me with what exactly I need installed.

Current Panel, seems like just a set of regular 120V circuits, is that right?

https://i.imgur.com/A7Q5GtB.jpg

If this is a 3 phase, then based on some research it looks like the first row is phase A, second phase B, third phase C. This is irrelevant to each circuit of course which is single phase.

Anyway, if I get an electrician, what do I tell them I need? I'm going to have a set of antminer s15, 1600 W each, @240V.

Thanks for any help.

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[1715621176]

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[Artemis3]

If your phases are 120v each, you have to make your circuits using two hots from different phases, instead of the usual hot neutral, with a pair of tied breakers per circuit.



So for phases A B C, your first circuit uses A+B, second uses B+C, and third uses A+C. Then keep repeating as needed.

This method would give you 208v per circuit, but needs nothing else, and the miners would work.

Of course if your phases are already 240v each instead of 120v, you don't need to use double hots, you make your circuits normally using a single breaker with a single hot each.

In North America the NEMA 6 plug is supposed to be used for 208~240v circuits, take a quick look at your receptacles:



In an ideal world you would be getting 240v for each phase from the street, but that probably needs re-configuring the transformers which are usually in the realm of the utility providing your power service. Thing is, those wires hanging on poles outside (or underground) are actually 11k volts, so transforming that down to 120v or 240v makes little difference to them. In fact its more efficient if they deliver you the higher voltage. Depending on country/utility that might be a long process but its always good to know.

[mikeywith]

Anyway, if I get an electrician, what do I tell them I need?

tell them this:

I'm going to have a set of antminer s15, 1600 W each, @240V.

[philipma1957]

tell the electrician

I want you to make 5x 30 amp 240  circuits with this outlet

https://www.amazon.com/Aweking-Receptacle-Connector-Grouding-Locking/dp/B0775NXJC3/ref=sr_1_1_sspa?

use 10 gauge wire for each one.

I will be hooking these up to them

https://www.ebay.com/itm/HP-228481-002-417580-D71-Series-EO4501-200-240-VAC-24A-Modular-PDU-Control-Unit/283379395003?

it is okay if you are at 208 volts-240 volts

see this photo for reference
each receptacle is 30 amps 240 volts 10 gauge wire.

NO gang wiring!!!
1 circuit per outlet!!!!



this info below is for you

the above 5 pdu's   can do 15 s15's   3 per pdf

or 20 s9's 4 per pdu

if you have just that panel  and no other.

say you want 3 circuits  30 amp to the receptacle above.

and buy 3 pdu's on ebay like the ones I listed.

[Steamtyme]

Yeah Phil nailed it, and his photo is from experience. The side bits though, so you don't have unforeseen bureaucratic downtime.

Make sure you find out from the city what the lead time is for this "Certificate of Occupancy". I'm guessing you meant the power company needs to see one of these from the city beforehand. So I would double check with the city: What sort of inspection/proof is required for the permit and timeframe for the whole process - so you or the utility company has it in hand.

Next run through a couple of electrician quotes. Show them the list Phil gave you and pay attention to see if it makes sense to them. I've seen crews say all good, only to end up just botching the overall install and not meeting expectations. Which is the follow up, be on site when they are wiring up the plugs. Again there is likely to be some permitting involved so be prepared for this as well; also a good sign if the contractor doesn't start talking about there being no need to permit the job.

Your job isn't huge from the panel out. So it will be a small project to oversee, but delays can be a bitch on any project. Good on you finding a space.

[philipma1957]

the pdu's I linked are all over ebay at 24-35 usd a great price.

this cable  will run  the m10 the s15 or the t15

https://www.amazon.com/C20-C13-Power-Cord-IBX-1622-06/dp/B00P2QN3AG/ref=sr_1_12_sspa?

this cable should do 2 s9's

https://www.amazon.com/IEC-C20-C13-Splitter-Cord/dp/B07JBKZN8N/ref=sr_1_13?

[betajuice]

Wow thanks so much, that is great info.

[betajuice]

This is overkill in my opinion, at 30a you could easily have two sockets per circuit. Unless you plan to use a type of miner different to Bitmain's, something that pulls 20a @220v? And in that case you can simply not use both sockets but one.

A typical S9 pulls like 6a, and the S15 isn't too far from that. You are plugging a 6~8a to a 30a (24a 80/20 rule) circuit. I mean, 6 from 24a, i'm giving you extra leeway by telling you two, even three or four is possible in a 30a circuit and still not exceed 80% load...

I don't understand what's wrong with 1 socket per circuit, if 1 PDU is 24A, about 3 miners can run off the single plug.

[philipma1957]

This is overkill in my opinion, at 30a you could easily have two sockets per circuit. Unless you plan to use a type of miner different to Bitmain's, something that pulls 20a @220v? And in that case you can simply not use both sockets but one.

A typical S9 pulls like 6a, and the S15 isn't too far from that. You are plugging a 6~8a to a 30a (24a 80/20 rule) circuit. I mean, 6 from 24a, i'm giving you extra leeway by telling you two, even three or four is possible in a 30a circuit and still not exceed 80% load...

what I wrote is 100% correct to code.

as I wrote to use a pdu with each circuit.

my information is perfectly correct you missed that each socket gets a pdu with 4 plugs to it.

you can do 3/4 s9's to the pdu or 2/3 s15's

this pdu in particular is exactly correct.

https://www.ebay.com/itm/HP-228481-002-417580-D71-Series-EO4501-200-240-VAC-24A-Modular-PDU-Control-Unit/283379395003?

you mis-quoted my post and left the pdu part out.

please correct yourself

@betajuice most likely he misread my post and did not see that I specifically said used a pdu exactly rated for 1x 30 amp circuit.

Hopefully he sees this and fixes his comment.

To further speak on this used pdu's on usb eBay are really cheap.  the ones I linked are over 100 new and I get them for 22-30 each.

they are fused  4 plugs each can do 14 amps all have their own reset switch for 14 amps.

the whole unit has a 24 amp reset switch. so 4 s9's may or may not work on 1 pdu. 3 will.

same about s15 3 may be too much 2 will work.

so 1 l6-30r on the wall attached to the pdu gives up to 4 units safely

this is why I said just fine receptacle per 30 amp breaker.

if you can not get pdu's cheap then consider  a different plan.

[betajuice]

Anyone know what I should expect it to cost, as a ball park figure, for that kind of electrical work? (the kind philipma1957 suggested).

When they give me a quote I don't really have any previous experience to base it off of, I won't know if it's insanely high or a good deal.

Thanks

[NotFuzzyWarm]

All depends on where you live... No matter what, get several quotes.

[mikeywith]

you can refer to my wiring method here >https://bitcointalk.org/index.php?topic=5087770.0

you will however need to make a few changes, 25amp mcb can only handle 3 S15s , also the wire size will have to increase a bit.

[s_falahati]

You should just give your electrician your requirements. A lot of topics discussed here and are valuable, but lets just the expert does it as he sure knows better, has more experience and unlike us actually can see the wirings and check the lines, etc, etc.

Tell him you got X number of devices that each need around 8A 220V single phase, continuously through the night and day in winter and summer, and is concerned about the fluctuations of voltage in lines especially when a new device connects (a 2000w device can take up to 10000w for a short amount of time very easily. So he should be aware of that to be able to plan accordingly when all devices start to become online after a power outage or other situations). Also, describe the fact that these devices are expensive and the safety of them as well as the fire hazard is important for you.

And you got a 110v source 3 phase (or any other input you have at your warehouse)

If you want to be really sure, you can bring another electrician later to check the work of the first one in respects to your requirements.

In regard to price; get more than one quotes and compare them. Considering the fact that this setup is actually not overly complicated, it should be easy to compare what they are going to do. You can also ask them to specify how they want to handle the job and compare those in regard to the amount of money they ask for. Maybe someone can offer better protection but you don't really need, or someone makes is with the least cost but his setup is not the safest. You can then find a balance.