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

Procedure

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. See Figure 1 or Figure 2 or Figure 3 for the ground pin (G).

Note: The customer circuit breaker that supplies ac voltage to the customer ac power outlet should still be off.

Is the voltage less than 1.0 V ac?
- Yes, go to step 4.
- No, continue with the following step.
Figure 1. Single-phase, 200 - 240 V, 60A, IEC60309 customer outlet pins

Figure 2. Three-phase low voltage (200 - 240 V) phase-to-phase, 60A, IEC60309 customer outlet pins

Figure 3. Three-phase high voltage (380 - 415 V) phase-to-phase, 30A, IEC60309 customer outlet pins
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)
Prepare the multimeter to measure 1.0 ohm or less of resistance.
Measure the resistance between the customer AC power outlet ground pin and the building ground. See Figure 1 or Figure 2 or Figure 3.

Is the resistance 1.0 ohm or less?
- Yes, continue with Checking customer receptacle voltage pins with customer CB off (plug in).
- No, inform the customer. Do not continue until the resistance is 1.0 ohm or less.