Figure 4-3 Voltage Reference Points for IEC 320 C19 Plug
IMPORTANT: Perform the following measurements for every power cord that plugs into the
HP 9000 rp7420 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 measured should
be between 200–240 VAC regardless of the geographic region.
2. Measure the voltage between L1 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is between
200–240 VAC.
3. Measure the voltage between L2 and ground. In North America, verify this voltage is between
100–120 VAC. In Europe and certain parts of Asia-Pacific, verify this voltage is 0 (zero) VAC.
Table 4-1 provides single phase voltage measurement examples dependent on the geographic
region where these measurements are taken.
Table 4-1 Single-Phase Voltage Examples
Europe
1
North AmericaJapan
230 V208 V or 240 V210 VL1-L2
230 V120 V105 VL1-GND
0 V120 V105 VL2-GND
1 In some European countries there might not be a polarization.
Verifying the Safety Ground
This measures the voltage level between B0 and A0. The measurement is taken between ground
pins of the two power cords. For ground reference points when performing this measurement,
see Figure 4-4.
Checking the Voltage 53
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