"We have to choose between 120, 208, or 240v power to the UPS."
Generally your better off using higher voltage input to devices. The higher voltage allows larger device to a circuit, and generally has less resistance losses; higher voltages use will require few number of circuits overall (lower voltage lines as in 120v lines are usually loaded with higher amperage, more easily overloaded). For any given device, running at a particular wattage, if you double the input voltage (say from 120v to 240v ), current draw (amps) is half .
"For example, can I run a 208v 30A power cable into a PowerEdge R710 over a C13/C14 cable?"
No because c13/c14 are not rated for 30 amps, for one reason, and r710 has no where near the draw of 30amps, as reason two. C13/C14 connector/line commonly is rated as 10 amp.
As far as "input" power, do not be concerned as to the power supplies in servers as they they have overload protection built into the power supply circuit, though they still need to be on a circuit of a particular size/breaker.
"Does anyone here know where the input power requirement specifications are defined?"
In the National Electricial Code, there are complex requirements as to circuits given the wattage circuits use.
With your limited knowledge of electric circuits, print out the specification sheets of all your devices, document any other devices you have, and proposed future devices and give them to an electrical Engineer (preferably) or a licensed electrician.
pcmeiners
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June 21st, 2011 07:00
"We have to choose between 120, 208, or 240v power to the UPS."
Generally your better off using higher voltage input to devices. The higher voltage allows larger device to a circuit, and generally has less resistance losses; higher voltages use will require few number of circuits overall (lower voltage lines as in 120v lines are usually loaded with higher amperage, more easily overloaded). For any given device, running at a particular wattage, if you double the input voltage (say from 120v to 240v ), current draw (amps) is half .
"For example, can I run a 208v 30A power cable into a PowerEdge R710 over a C13/C14 cable?"
No because c13/c14 are not rated for 30 amps, for one reason, and r710 has no where near the draw of 30amps, as reason two. C13/C14 connector/line commonly is rated as 10 amp.
www.dell.com/.../server-poweredge-r710-specs-en.pdf
www.dell.com/.../powervault_md3000_specs.pdf
www.dell.com/.../pvaul_tl2000_specs.pdf
As far as "input" power, do not be concerned as to the power supplies in servers as they they have overload protection built into the power supply circuit, though they still need to be on a circuit of a particular size/breaker.
"Does anyone here know where the input power requirement specifications are defined?"
In the National Electricial Code, there are complex requirements as to circuits given the wattage circuits use.
With your limited knowledge of electric circuits, print out the specification sheets of all your devices, document any other devices you have, and proposed future devices and give them to an electrical Engineer (preferably) or a licensed electrician.