Figure 3-21 Voltage Reference Points for IEC 320 C19 Plug
IMPORTANT: Perform these measurements for every power cord that plugs into the server.
1. Measure the voltage between L1 and L2. This is considered to be a phase-to-phase
measurement in North America. In Europe and certain parts of Asia-Pacific, this measurement
is referred to as a phase-to-neutral measurement. The expected voltage should be between
200–240 V AC regardless of the geographic region.
2. Measure the voltage between L1 and ground. In North America, verify that this voltage is
between 100–120 V AC. In Europe and certain parts of Asia-Pacific, verify that this voltage
is between 200–240 V AC.
3. Measure the voltage between L2 and ground. In North America, verify that this voltage is
between 100–120 VAC. In Europe and certain parts of Asia-Pacific, verify that this voltage
is 0 (zero) V AC.
Table 3-4 provides single phase voltage measurement examples dependent on the geographic
region where these measurements are taken.
Table 3-4 Single Phase Voltage Examples
Europe
1
North AmericaJapan
230V208V or 240V210VL1-L2
230V120V105VL1-GND
0V120V105VL2-GND
1 In some European countries there may not be a polarization.
Verifying the Safety Ground (Single Power Source)
Use this procedure to measure the voltage level between A0 and A1. It also verifies the voltage
level between B0 and B1. Take measurements between ground pins. Refer to Figure 3-22 for
ground reference points when performing these measurements.
68 Installing the Server
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