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3
votes
3answers
483 views

How many power circuits do I have in a rack?

I'm planning to get some colocation space from someone in my area, and like most companies that offer colocation, ask about power supplies (of course) in the quote form. I'll need a power of 1000W ...
13
votes
6answers
1k views

Can I plug a 15A UPS into a 30A receptacle?

I know that typically electronics draw only as much current as they need. Is this the case with UPSs? I have a 120 volt, 30 amp circuit, and am replacing the UPS plugged into that circuit with a lower ...
1
vote
2answers
56 views

Is it safe to locate a UPS close to server

I have an Eaton 5S and a HP Microserver. I'm wondering if there's likely to be any problems stacking the former on of the latter (aside from stability). Do I need to be aware of any electrical ...
5
votes
1answer
86 views

Using more than 80% power on a circuit in a disaster scenario

We currently have two cabinets of equipment at our datacenter, and each cabinet is served by two 30A circuits. The facility is relatively new, and each circuit is (supposedly) redundant at the source. ...
3
votes
5answers
199 views

Multiple electrical supplies in a server room

Our server room has four cabinets (not fully utilized) and is supplied by several electric circuits from two different electrical services. Some of the equipment is 208V from a 3-phase service and ...
5
votes
2answers
104 views

UPS for 30A service to server racks

Our server rack has two 208V 30A dedicated circuits running to it, each to a PDU mounted in the rack. Most of the equipment has redundant power supplies so one goes to each PDU. I'm not sure who had ...
6
votes
1answer
191 views

Do I have an under-voltage issue in my data room I need to address?

I recently had a UPS fail to do its job during business hours because I didn't realize it had already reached the end of its useful life. Yes, the battery was old and, yes, I should have manually ...
41
votes
5answers
2k views

PDU wiring - is this normal (or even safe)?

I removed the side panel of our server rack so I can clean up some of the wiring. Inside I found the PDU was wired like in the picture. Instead of an incoming power cable, there's just 3 uninsulated ...
2
votes
1answer
290 views

I'm considering using a Mineral-oil as a coolant for a submerged server. What fire precautions should I take?

I'm investigating different ways to safely and efficiently cool down one of our servers that uses two GPU cards for intense renderings that takes hours to complete. The overall system wattage is ...
7
votes
2answers
334 views

10GBASE-T shielded cable switch-to-server connection

I'm venturing for the first time into the 10 gigabit (over copper) realm. Likewise, I have never worked with shielded CAT-5/6 cables previously. From my own research, I understand the types and ...
1
vote
1answer
105 views

Is a 650W PSU enough for 4x 7k HDDs 2x CPUs and a monster AMD Radeon HD 5990 [closed]

I bought a supermicro chassis a few years ago with a 650W PSU for a personal lab I built. Everything has been just fine so far, but now that I'm looking into some GPU based work, I'm finding that I ...
38
votes
3answers
1k views

Assessing equipment damage following a lightning strike - Should I have planned more?

One of my client's sites received a direct lightning hit last week (coincidentally on Friday the 13th!). I was remote to the site, but working with someone onsite, I discovered a strange pattern of ...
-10
votes
1answer
127 views

Amperage of HP DL140 G1 [closed]

How many amperes DL140 G1 Dual Xeon 3.06 with 2 IDE disks normally consumes at 240V ? Need to calculate colocation costs. My reading : DL140 G1 Dual Xeon 3.06 with 2 IDE disks consumes 1.7A for me, ...
1
vote
1answer
301 views

Self-Resetting Power Strips? [closed]

We are about to deploy a number of secure kiosks into an environment where they may be prone to lightning strikes and power surges on a somewhat regular basis (southern Florida in a place where the ...
15
votes
3answers
3k views

How does a 3-Phase UPS distribute power?

We've got 2 UPSes in our server room. One's 3 phase, and has a 3phase supply, yet the APC network stats thing only says Incoming Voltage: 230.1 Volts The other is a single phase one with no ...
11
votes
5answers
1k views

Why is it important to ensure equipment is well-grounded?

I am installing a new ethernet switch, and the instructions say to connect the ground screw to the rack or some other kind of electrical ground. What are the risks of not ensuring that equipment is ...
10
votes
3answers
383 views

Should pcs be unplugged before restoring power

We have an upcoming scheduled power outage for maintenance. UPS protects our servers. But it has been suggested that all PCs should be unplugged to prevent damage from power surges when power is ...
2
votes
4answers
600 views

Older UPS smells like burning

Just trying to investigate cause of an older UPS that smells like burning plastic. Is it likely to be the electric socket, the cooling system of the UPS, or has the unit faulted? If so, what causes ...
181
votes
14answers
6k views

What is this very short power cable called?

I have a couple of networking components in my rack that take giant AC adapters ("power bricks") that don't fit neatly into my rackmount PDU. I have one "thingy" that is shown below, and I need to ...
0
votes
1answer
135 views

30 ampere machine [closed]

I have a machine tha takes input of 30 ampere, and my power socket iof only 16amps, please advice wha chnges i will have to make??
0
votes
3answers
97 views

Powering Computers [closed]

How much electricity is required to power twenty average computers on a LAN?
-3
votes
3answers
129 views

what is analog and digital signal in electrical terms? [closed]

Analog signals are continous while the digital signals. In electrical terms digital signals are like +5 volts then 0 volts again +5volts , +5volts , 0volts and so on am i right???? and the analog ...
3
votes
4answers
587 views

Server power meter, 220V [closed]

I would like to monitor my server power usage over time, but I'm in 220V area (Europe), and everything I can find on the net is for 110V, like this one here: Kill A Watt Load Meter It seems like ...
2
votes
1answer
151 views

How is made sure magnetic or electric fields from devices like transformers or fans close nearby do never affect hard drives?

Fans and transformers which are inside the server case create magnetic and electric fields. Electric fields can be easily shielded, but what about magnetic fields, they can only be shielded with high ...
7
votes
6answers
5k views

Which is better - 30 AMP 220V circuit or 60 AMP 120V circuit

I'm looking for advice on which electrical service I should have run to a rack that I have in a data center. The price is the same for either a 30 AMP 220V circuit or a 60 AMP 120V curcuit. I ...
12
votes
8answers
1k views

Datacenter Power requirements. A=W/V… I must be doing something stupid

Okay, our datacenter doesn't charge us based on our "useage" just on how many Amps we have delivered to our rack. I'm planning on putting in a new rack this upcoming year for some server expansion, ...
0
votes
1answer
55 views

Is it possible for EMI to affect power on?

I have a server that boots fine everyone in the office except for in the room I want to put it in. When I put it in that room it won't even get to the loading Windows screen it simply gets stuck in a ...
1
vote
2answers
136 views

what technical specifications should I take into account for a network of 20 computers?

I need to know that electrical characteristics are necessary for a network of 20 computers. There are just 20 PCs in a room. There aren't servers and are connected in series. I just need the ...
5
votes
3answers
682 views

Calculating how Much Power is needed For Servers

How do I calculate how much power I need for my servers / switches / routers? This is needed when moving into a datacenter. I figure I should just add up the wattage on all the power supplies even ...
9
votes
1answer
282 views

Sysadmin in the Developing World: What are the differences between various kinds of power protection?

Hello I'm an ICT (InfoComTech) US Peace Corps volunteer deep in Tanzania who has the task of managing and advising concerning our college's two SunFire Sun Ray Servers and Dell Proxy server (on 2 ...
4
votes
6answers
2k views

5v AC Adapter with multiple outputs?

In a couple of areas we have multiple devices that all run on 5v and have multiple adapters with standard jacks, which annoyingly require multiple sockets and cables. Does anything like an adapter ...
28
votes
9answers
13k views

UPS and power strip interactions?

Sometimes I hear that you shouldn't plug (UPS brand X / any UPS) into (power strip brand X / any power strip) because of some interaction leading to poorly conditioned power, reduced battery life, ...
6
votes
9answers
2k views

Do I need some kind of power conditioner or UPS?

In one of my boxen, both my power supply and network card died while in overnight hibernation - why? And: What must I do to appease the electricity Gods so that I don't lose more hardware? In ...
14
votes
7answers
2k views

How much electricity is required to power 20 'average' computers on a LAN?

i trying to see how much electricity is required to power 'x' number of computers. I know it's a vague thing because some computers draw more than others (eg. diff chipsets, HDD, vid cards, PSU's, ...