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. ...
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 ...
1
vote
1answer
293 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 ...
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
382 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 ...
179
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 ...
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 ...
5
votes
3answers
679 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 ...
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, ...