DS8000 Service Documentation Version 7.5

Checking customer receptacle ground pin continuity with customer CB off (plug in)

Procedure

  1. Prepare the multimeter to measure 1.0 V ac or less. Measure the voltage at the customer's AC power outlet between the ground pin and the building ground.

    Is the voltage less than 1.0 V ac?

    • Yes, go to step 3.
    • No, continue with the following step.
  2. Voltage is present at a customer outlet with the customer circuit breakers off.
    DANGER
    Inform the customer that, even though the circuit breaker is off, voltage higher than 1.0 V ac is measured at the failing customer voltage outlet pins. Do not continue until the voltage is less than 1.0 V ac. (1003)
  3. Prepare the multimeter to measure 1.0 ohm or less of resistance.
  4. Measure the resistance between the customer AC power outlet ground pin and the building ground. Refer to Figure 1 or Figure 2 for the location of the ground pin.

    Is the resistance 1.0 ohm or less?

    Figure 1. Three-phase amp
    Three-phase amp
    Figure 2. Single phase, ground pin
    X3550 management console server LEDs (rear view)