I installed 2 60 amp 3 phase receptacles in my warehouse in CA on a Friday a few months back.  On the following Monday morning I had 3 trucks from the city and utility department taking pictures and documenting everything.  They threatened to shut down power but I have a monitored fuel tank in the back so the state law prevented that from happening.  My power usage went from 4 kW to 44 kW and I do have a smart meter at the building, so that's what triggered it.  I have attempted to get a permit after the fact but ran into issues with that so they will probably come by one day to disconnect everything.  I just applied for 1 MW of power at a building in WA so I hope that goes smoothly, currently running 40 kW there without incident.

The numbers are distance in feet from the unit.  I didn't have time to change the frequency and test readings with each frequency.  I think that the post you reference is the side hack mod, but I don't know much more about it as it was already done when I received the unit last week.  I believe it is a way to increase the efficiency of the unit but someone can correct me if I am wrong.

Antminer S7-LN with sidehack mod

1'  55 decibels
5'  45 decibels
10' 42 decibels
15'  39 decibels

I'm not currently running them here at the house but will connect them up later today and take some readings for you.  I'm taking them up to the cabin Monday morning so they are still here.  I have a real sound level meter for my audiophile system so I will take readings with that while they are running.

I'm only familiar with Bitmain products and mostly S9s, but I just bought some S7s as a space heater for my cabin and I turned their frequency down to 475M which still lets their hash rate stay above 3 tH/s and keeps their power down to under 1,000 watts.  The S7-LN has only 2 hash blades, comes with a PSU, and is very quiet and doesn't produce much heat.  You can also change the frequency on the S7-LN to further reduce power consumption and therefore reduce heat and noise.

I believe that the most common outlet in North America is 15 amps at 120 volts, depending on the power supply that you received, it may not start below 205 volts.  The newer ones operate on 120 as well however only deliver up to 1100 watts on 120.  S9 total current should be around 12 amps at 120 volts or 6 amps at 240 volts.

Wire gauge size depends on amperage and resistance, an electrician should be able to determine an adequate sized wire for you application. 30 amps at 220 volts can safely power 3 S9 miners, at 240 volts you could run 4 S9s.

Your cables will depend on your pdu, either a c14 to c13 or a c20 to c13.

They can be a fire hazard if you don't understand electricity or if you overload your circuits.

Are you renting hashing power or do you run your own miners?  According to your screen shot it looks like you were contributing hashing power for 15 minutes but it varied wildly.  If you can send a screen shot of your miner configuration setup and miner status it would give us more info to help you.

What is the cfm of the fan(s) that you are using?  You'll need a way to bring in fresh filtered air and exhaust the hot air.  The window air conditioner won't do much so I wouldn't bother running it.

The amp limit was simply referencing the available power specific to the OP.  The closer you get to the breaker limit the greater the chance or breaking the circuit or if not properly protected, starting a fire.  Also, you have to make sure the wires are sized properly for the current flowing through the circuit. An S9 pulls nearly 1500 watts, a general use computer pulls an average of 500-750 watts depending on the setup.  You can have a building with thousands of computers or thousands of S9s as long as you have enough power and ventilation for your setup.  On a 40 amp 230 v circuit you can only have 5 S9s or 10-15 computers, assuming they are running 24 hours a day.  I'm not talking about mining rigs, I've haven't built one yet, just talking about general computers.

I would not put more than 5 Antminer S9s into a 40 amp  230 v circuit.  Don't forget to derate 80% if you are following NEC; you don't want to trip the breakers, or worse cause an electrical fire if the breakers aren't sized properly.  Hire an electrician to determine if there is more available power, get permits from the city, and also keep in mind the ventilation requirements to keep the equipment from overheating.

What miner(s) are you using?  Have you verified that your hardware is functioning properly?  Check your hardware first, you may have lost a board in your ASIC.

I just connected 135 tH/s to your pool at 4pm Pacific, noticed that they all went to a secondary pool just before your post.  What city is your Silicon Valley server in?  My mini farm is in Santa Clara, with phase 2 going into a server room in Sunnyvale in August.  It's hard to find affordable power and ventilation for these things.

I have both Bitpay and Shift.  I haven't funded my Bitpay card yet because I think it has higher fees than Shift. I've been using my Shift card when the value of Bitcoins are up, and then use cash/regular credit cards when Bitcoin goes down in value.  The Shift card interfaces directly with Coinbase and it has a really nice app that tell you the amount of purchase and the value of Bitcoins at the time of purchase.  I don't have a lot stored Bitcoin value in Coinbase and I'm aware that many users have had issues with them.  It's still a great feeling when paying for groceries/dinner with something other than fiat currency.  I've had the Shift card for about a month and haven't had any issues at all.

What is the service voltage at this factory?  Even at 480V 3Phase service you would need close to 900 amps just for 400 miners, not to mention ancillary equipment.  This assumes an 80% derating for continuous loads and 1,450 watts per miner.  I'm currently in the process of upgrading my service voltage to 480V 3Phase 600 amp service, will take 6 months or more for just the permits.  Also, don't forget that each S9 puts out over 5,000 BTUs of heat per hour, you will need to find a way to dissipate all that heat for 150 miners.

Antminers can be used with any SHA-256 algorithm coin, not ETC or ETH.

https://www.meetup.com/Silicon-Valley-Bitcoin-Users/

Next meeting is July 11th in Sunnyvale

I've got miners on 3 different pools at the moment.

Your expected daily earnings is an average that your 10.5 tH/s will produce per day over a longer period of time.  You can't base an average from 1 or 2 days at a pool.  Some days it will produce more, some days it will produce less, and some days you won't get a reward at all.  Also, at Slushpool and maybe elsewhere, it will take about 16 hours for unconfirmed rewards to be confirmed and it takes some time for your scoring hash rate to come up depending on the pool.  Slushpool only found 4 blocks on the 15th, so it was a little bit lower than average; some days they find 10 blocks.  Kano is a great pool, as is slushpool.

Where did you get the default IP address info?  Was it written on the S5 and did you buy it used?  If so, the ip address probably has changed.

The default setup in my S9 is set to dhcp to get an IP address from the router.  You have to do what unholycactus said.  Look up your router model and find out how to access the device list.  Mine will say something like 192.168.1.xxx/antminer where xxx are additional numbers.

I haven't owned my S9s long enough to know what beeps you are talking about.  Are both fans spinning up?

You can set either kWh or power consumption to 0, that will calculate pure profit from your miner without any electricity costs.  -ck said it best, you should stop as soon as you can, not worth your time or computing power.

If you change the parameters on top to 24 hours, it will change the hashrate distribution, right now the 24 hour hash rate is 0, so it doesn't even show slushpool.

Terahash/sec rate went from 4,500,000 to over 5,000,000 rather quickly. A difference of 500,000 TH/s is equivalent to about 37,000 S9s coming online.  I've linked the hashrate for 30 days below, very sporadic swings.  I'm not sure why the sporadic nature of the chart is like that, I would expect something more linear.

https://blockchain.info/charts/hash-rate?timespan=30days