Electrical Conversions
174 SL8500: Systems Assurance Guide • July 2011
E24254-01
To Find Volt-Amperes (VA)
When Volts and Amperes are known, you can use the previous example:
Volts multiplied by Amps = Volt-amperes (VA)
Volts [VAC]
x
Amps [A-rms] = Volt-amperes [VA]
For example:
A small server is plugged into a 120 VAC 60 Hz power source
and is rated at 2.5 amps.
120 VAC
x
2.5 amps = 300 VA
To Find Kilovolt-Amperes (kVA)
Single Phase:
Again, using the previous example:
Volts multiplied by Amps divided by 1,000 = kilo-volt-amperes [kVA]
Volts [VAC]
x
Amps [A-rms]
÷
1000 = kilo-volt-amperes [kVA]
For example:
120 VAC
x
2.5 amps
÷
1000 = 0.3 kVA
Three Phase:
Phase 1
Volts [VAC] x Amps [A-rms]
÷
1000 = = kilo-volt-amperes [kVA]
Phase 2
Volts [VAC] x Amps [A-rms]
÷
1000 = = kilo-volt-amperes [kVA]
Phase 3
Volts [VAC] x Amps [A-rms]
÷
1000 = = kilo-volt-amperes [kVA]
Total kVA
kVA (phase 1) + kVA (phase 2) + kVA (phase 3) = kVA (3-phase total)
Using the single phase example above:
0.3 kVA + 0.3 kVA + 0.3 kVA = 0.9 kVA
To Find Kilowatts
Finding kilowatts is a little more complicated because the formula requires a value for
the “power factor.” The power factor (PF) is not a precise value (unless known), but
required. This factor can vary from 60–95% and is rarely published on the equipment.
For purposes of these calculations a power factor of 0.85 is used.
Volts
x
Amps
x
PF
÷
1000 = Kilowatts (kW)
Summary of Contents for StorageTek StreamLine SL8500
Page 4: ...Summary of Changes iv SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 12: ...Contents xii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 18: ...Tables xviii SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 76: ...Introduction 56 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 97: ...E24254 01 Chapter 3 Site Survey Forms 77 Site Survey Forms Figure 21 Content Management Plan ...
Page 137: ...E24254 01 Chapter 4 Site Preparation 117 Site Preparation ...
Page 138: ...Site Preparation 118 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 198: ...Electrical Conversions 176 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 206: ...Comparisons 184 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 233: ...E24254 01 Appendix H Partitioning 211 Partitioning Make copies as necessary ...
Page 240: ...Partitioning 218 SL8500 Systems Assurance Guide July 2011 E24254 01 ...
Page 251: ...E24254 01 Appendix J Work Sheets 229 Work Sheets Figure 73 Content Management Work Sheet ...
Page 276: ...Index 254 SL8500 Systems Assurance Guide June 2011 E24254 01 ...
Page 277: ......
Page 278: ...Oracle Corporation Worldwide Headquarters 500 Oracle Parkway Redwood Shores CA 94065 U S A ...