Electronics > Beginners
How to wire up a 240VAC receptacle
C:
Looks like you like to ignore simple facts.
In the USA the standard electrical outlet is 110-120 volts 60hz.
All 220-240 volt stuff uses different connectors. Because of the difference people take more care.
Think of how many people in the USA have used computer power cords. For the USA the end that connects to a computer is 115volts. For a lot of the world that is 220volts but not in USA.
So now you have people seeing the computer end thinking 115volts and connecting an extension cord to your PDU, but that is not 115 volts. A part of safe is knowing what to expect.
So what is a safe European standard is not as safe in the USA due to common thought.
The added transformer is creating a safe NON-USA standard in addition to wasting power. That transformer will get hot, and that is a waste of power.
One thing you might like to know is that 220 volt 60hz is more dangerous then 220 volt 50hz. The 60hz has a greater chance of messing up your heart beat then 50hz.
If you want real safe 220 volts using a USA split phase( 220 Volts with a neutral center tap) you use a four wire connection. The forth connection the safety ground.
Unlike the rest of the world USA 220 volt equipment often has some 115 volt loads.
C
Richard Crowley:
--- Quote from: Spork Schivago on May 16, 2018, 06:40:52 pm ---So, I run both "phases" or "mains" into H1 and H7, after tying them together?
--- End quote ---
No. If you "tie both phases together" you will put a dead short across your utility mains power and instantly trip the breaker.
Hopefully the breaker will protect you before starting a fire and burning down your house.
--- Quote ---and then neutral into H10 and H4 together?
--- End quote ---
No. The neutral plays no part here. You only need the neutral line if you want 120V.
The only way you can get 240 volts to feed into the transformer is between the two "phases".
One "phase" goes to H1-H7, and the other "phase" goes to H4-H10
Neutral goes to X1 and X4 is your single-phase 240V to feed your PDU.
Richard Crowley:
--- Quote from: C on May 16, 2018, 09:41:40 pm ---So now you have people seeing the computer end thinking 115volts and connecting an extension cord to your PDU, but that is not 115 volts. A part of safe is knowing what to expect.
--- End quote ---
Yes the IEC 60320 power connector (the standard connector on computers, printers, etc.) is ambiguous because it is used for both 120V and for 240V connections. The only protection here is that the HPE PDU is a specialty product in a special environment where only people who know better will be plugging things into it.
--- Quote ---The added transformer is creating a safe NON-USA standard in addition to wasting power. That transformer will get hot, and that is a waste of power.
--- End quote ---
Yes. Alas that is true whenever you must convert power from one voltage to another.
--- Quote ---One thing you might like to know is that 220 volt 60hz is more dangerous then 220 volt 50hz. The 60hz has a greater chance of messing up your heart beat then 50hz.
--- End quote ---
I would like to see some reference for that. It doesn't make sense from other evidence.
--- Quote ---If you want real safe 220 volts using a USA split phase( 220 Volts with a neutral center tap) you use a four wire connection. The forth connection the safety ground. Unlike the rest of the world USA 220 volt equipment often has some 115 volt loads.
--- End quote ---
The modern standard for North America ALWAYS requires a safety ground (BrEnglish: "protective earth") connection. THe modern convention is a green wire with yellow stripe.
The presence of the safety ground does NOT make a product like that HPE PDU "safe". Because the PDU was designed with the assumption that Neutral is essentially zero volts. Connecting it to USA split phase will put Neutral at 120V which is unsafe for this PDU. The presence of the safety ground does not change this problem.
tpowell1830:
Patience is often referred to as a virtue... if so then Mr. Crowley is very virtuous.
|O
Spork Schivago:
--- Quote from: james_s on May 16, 2018, 09:09:37 pm ---Remind me what this is all for?
IMO by the time you get to several kW of computer gear in the basement, it's time to start looking for a proper data center.
--- End quote ---
This is a datacenter. Our datacenter. We are just running it out of the house for now, instead of renting a building in a commercial zone. We've already okay-ed it with the city, before we purchased the house. We can have a sign in the window, but can't put a big sign outside, other than that, we're good.
We used to rent a few servers over the internet, but that got to the point where it was no longer cost effective.
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