Is there an electrical engineer or industrial electrical contractor on board?

[748rpilot]

Paging any E.Es or industrial electrical contractors. I'm nearing the limits of my understanding of 3-phase power, Delta and Wye circuits and how this all works.

I have some pretty specific technical questions I'm trying to get firm answers to, and am going to need the math behind the answer as well.

If you might be interested to educate me, please DM me and I can provide more specific details and contact information.

Thanks,

748rpilot

 

[TheHorta]

I can’t help you. Sorry.

 

[748rpilot]

I can’t help you. Sorry.

No problem. When I need NV gear to go high-speed low-drag on hogs I'll hit you up.

 

[TheHorta]

No problem. When I need NV gear to go high-speed low-drag on hogs I'll hit you up.

I was trolling for a way more retarded reply.

Was I too obvious?

 

[748rpilot]

I was trolling for a way more retarded reply.

Was I too obvious?

Oh. No, I'm just socially challenged and assumed it was a genuine reply.

 

[Sean the Nailer]

Where's a Lindy when you need one....?

 

[Kinetic Moose]

what you need

 

[The D]

How may I be of service?

 

[Milf Dots]

 

[Long Range 338]

I may be able to help depending on how in depth your calculations are. You can PM me the info.

 

[Threadcutter308]

Paging any E.Es or industrial electrical contractors. I'm nearing the limits of my understanding of 3-phase power, Delta and Wye circuits and how this all works.

I have some pretty specific technical questions I'm trying to get firm answers to, and am going to need the math behind the answer as well.

If you might be interested to educate me, please DM me and I can provide more specific details and contact information.

Thanks,

748rpilot

Will DM, but in the meantime, could you list up two or three questions that you're interested in ?

 

[748rpilot]

Sent some PMs, appreciate you guys even taking the time to look. I've already tried to answer the questions to the best of my ability, and think I'm pretty close, but others have other ideas.

 

[Maggot]

Well then.

Where's a Lindy when you need one....?

Lindy Sisk? He's on facebook, comments on Rifles Only a bit.

 

[roostercogburn98]

I can’t help you. Sorry.

If you weren’t too good to stay in a holiday inn express, you’d know more things

 

[NoDopes]

You'll find chatgpt may give you some solid answers for technical questions like this. It will provide references for it's answers.

 

[Mongo68]

 

[alpine44]

Paging any E.Es or industrial electrical contractors. I'm nearing the limits of my understanding of 3-phase power, Delta and Wye circuits and how this all works.

I have some pretty specific technical questions I'm trying to get firm answers to, and am going to need the math behind the answer as well.

If you might be interested to educate me, please DM me and I can provide more specific details and contact information.

Thanks,

748rpilot

Why don't you share your questions here so we can make this educational for everyone who cares.

 

[748rpilot]

Why don't you share your questions here so we can make this educational for everyone who cares.

These questions are maybe gonna seem a bit crazy, and some of them I believe I have the answers to, but other people have conflicting ideas. A couple of the questions are potentially manufacturing dependent, and I've contacted Support/Engineering with the manufacturer as well; their support lead-time is rather large. Anyway, thanks for taking the time to even look at this.

Thanks for offering to help. My questions specifically pertain to an APC AP8865 PDU, the product page is https://www.apc.com/us/en/product/A...ase-30a-36-c13-6-c19-and-2-nema-520r-outlets/

APC NetShelter Metered Rack PDU, 0U, 8.6kW, 208V, 3 phase, 30A, 36 C13, 6 C19 and 2 NEMA 5-20R outlets - AP8865 | APC USA, Specs relevant to my questions are,

Input voltage: 208V 3-phase
Output voltage: 120V, 208V
Line rated current: 24A
Max line current: 30A
Input current limits: 30A
Maximum input current (phase): 24A UL
Output voltage: 208V AC (line to line), 120V AC (line to neutral)
Maximum output current (phase): 24A UL
Maximum output current (bank): 16A UL
Banks: 3
Overcurrent protection: Three (3) 20A, 2-pole hydraulic-magnetic circuit breakers

I’m only interested in technical specifications, disregarding any environmental, safety or regulatory requirements.

It would be extremely helpful if you could show any/all calculations involved in deriving any mathematical answers.

Question 1: What is the maximum total power (Pt) that AP8865 can supply to servers/devices?

Question 2: If only a single bank is utilized, what is the maximum power (Pbm) that can be supplied by a single bank?

Question 3: If any two banks are utilized, what is the maximum amount of power that can be supplied?

Question 4a: Are the C13/C19 outlets wired as Delta or Wye circuits?

Question 4b: Are the NEMA 5-20R circuits wired as Delta or Wye circuits?

Question 5: Are the banks wired in series or in parallel?

Bonus information and bonus question: PDU AP8865 plugs into a panel with a 30A tri-pole circuit breaker. Is it possible to trip the 30A breaker (any pole) before tripping any PDU bank circuit breaker, excluding short or failure conditions in the PDU?

 

[748rpilot]

@Kinetic Moose spent quite some time on the phone with me, he was quite generous and helpful.

I'm posting my full query above since multiple people have asked...and so I'm sure some people can poke fun at me

I think my understanding is at least passable, there are, however, others who have different ideas on how things work. Neither side is willing to concede.

 

[748rpilot]

View attachment 8770755

My buddy was rehabbing a house and I was giving him a hand where I could and moral support where I couldn't.

He goes, "alright man help me move this gas line now."

I said, "mannnnn I was JUST about to go down the way and get some beers. Hey I'll be back in a lil bit though."

 

[Jscb1b]

Black is hot white is neutral green is ground payday is every other Friday.

 

[Jscb1b]

And the foreman is a dick.

 

[Ronws]

I never finished my EE degree but I have been studying electrical theory and electronics since 1975. And I are a master electrician. What I have learned is that you can know a lot but you won't know everything unless you have been in that specialty.

For example, I don't know more than a thimble full of thoughts about power generation electric and what the lineman do. Even with my big, fat license, I would have to ditch bitch to one of those guys.

Fortunately, the OP is in a forum where you are likely to find an expert on some specific things.

So, let me piss off any other master electricians. It's just a card. It means I passed a test open book with 100 questions within 5 hours and achieved at least a 75 percent. Back in 2002, I took the test from the ICC before TDLR took over. Already having the require experience, my journeyman license in one of the cities I worked in upgraded to master and then I was able to grandfather that when the TDLR licensing started.

And I still learn stuff every day.

And I have to be quick. We do electrical work for a niche market where the technology of the equipment we connect seems to change every 6 months and I don't know about it until the crews are on site and send me a picture. And I have find a PDF version of a manual so that I can offer guidance in broken English and Spanish.

But I knew I could answer adequately the OP's question, especially without more detail. Evidently, the questions have been answered ex-camera.

 

[chevy_man]

5-20r are single phase, so you can't have Delta or Wye...

16Ax120V is 1920 watts.

What I see says that you get up to 20A continuous on all 3, however NEC says you're supposed to only load to 80% aka 16A.

I would assume it's a wye. But I see nothing in those specs to say for sure. And I'm far too lazy to look up that equipment.

 

[chevy_man]

I never finished my EE degree but I have been studying electrical theory and electronics since 1975. And I are a master electrician. What I have learned is that you can know a lot but you won't know everything unless you have been in that specialty.

For example, I don't know more than a thimble full of thoughts about power generation electric and what the lineman do. Even with my big, fat license, I would have to ditch bitch to one of those guys.

Fortunately, the OP is in a forum where you are likely to find an expert on some specific things.

So, let me piss off any other master electricians. It's just a card. It means I passed a test open book with 100 questions within 5 hours and achieved at least a 75 percent. Back in 2002, I took the test from the ICC before TDLR took over. Already having the require experience, my journeyman license in one of the cities I worked in upgraded to master and then I was able to grandfather that when the TDLR licensing started.

And I still learn stuff every day.

And I have to be quick. We do electrical work for a niche market where the technology of the equipment we connect seems to change every 6 months and I don't know about it until the crews are on site and send me a picture. And I have find a PDF version of a manual so that I can offer guidance in broken English and Spanish.

But I knew I could answer adequately the OP's question, especially without more detail. Evidently, the questions have been answered ex-camera.

Licensing is all state specific. My masters test is 100 questions in 3 hours, with a minimum of 25 of them being calculations.
Journeyman's was 75 questions in 2 hours.

State runs the licensing here, so ICC and TDLR are meaningless to me....

 

[Milf Dots]

These questions are maybe gonna seem a bit crazy, and some of them I believe I have the answers to, but other people have conflicting ideas. A couple of the questions are potentially manufacturing dependent, and I've contacted Support/Engineering with the manufacturer as well; their support lead-time is rather large. Anyway, thanks for taking the time to even look at this.

Thanks for offering to help. My questions specifically pertain to an APC AP8865 PDU, the product page is https://www.apc.com/us/en/product/A...ase-30a-36-c13-6-c19-and-2-nema-520r-outlets/

APC NetShelter Metered Rack PDU, 0U, 8.6kW, 208V, 3 phase, 30A, 36 C13, 6 C19 and 2 NEMA 5-20R outlets - AP8865 | APC USA, Specs relevant to my questions are,

Input voltage: 208V 3-phase
Output voltage: 120V, 208V
Line rated current: 24A
Max line current: 30A
Input current limits: 30A
Maximum input current (phase): 24A UL
Output voltage: 208V AC (line to line), 120V AC (line to neutral)
Maximum output current (phase): 24A UL
Maximum output current (bank): 16A UL
Banks: 3
Overcurrent protection: Three (3) 20A, 2-pole hydraulic-magnetic circuit breakers

I’m only interested in technical specifications, disregarding any environmental, safety or regulatory requirements.

It would be extremely helpful if you could show any/all calculations involved in deriving any mathematical answers.

Question 1: What is the maximum total power (Pt) that AP8865 can supply to servers/devices?

Question 2: If only a single bank is utilized, what is the maximum power (Pbm) that can be supplied by a single bank?

Question 3: If any two banks are utilized, what is the maximum amount of power that can be supplied?

Question 4a: Are the C13/C19 outlets wired as Delta or Wye circuits?

Question 4b: Are the NEMA 5-20R circuits wired as Delta or Wye circuits?

Question 5: Are the banks wired in series or in parallel?

Bonus information and bonus question: PDU AP8865 plugs into a panel with a 30A tri-pole circuit breaker. Is it possible to trip the 30A breaker (any pole) before tripping any PDU bank circuit breaker, excluding short or failure conditions in the PDU?

You're gonna need a bigger boat.

 

[748rpilot]

You're gonna need a bigger boat.

I'm givin her all she's got Capt'n!