Installation Guide, Third Edition - Server Expansion Unit

Chapter 4
Cabling and Power Up
Voltage Check
77
Safety Ground Verification
This measures the voltage level between B0 and A0. The measurement is taken between ground
pins of the two power cords. Refer to Figure 4-36 for ground reference points when performing this
measurement.
Figure 4-36 Safety Ground Reference Check
Step 1. Measure the voltage between B0 and A0. Take the AC voltage down to the lowest scale on the volt
meter.
Step 2. Insert one probe into the ground pin for B0.
Step 3. Insert the other probe into the ground pin for A0.
Step 4. Verify that the measurement is between 0–5V AC. If the measurement is 5V or greater, escalate
the situation. Do not attempt to plug the power cords into the Server Expansion Unit.
Step 1
V
GND
L1 L2
L1 L2
GND
B0
A0