Checking customer receptacle voltage pins with customer CB off (plug in)
Procedure
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Do the following:
- Measure the voltage between each pair of voltage pins ( A to B , B to C and C to (G)) on the customer outlet.
- Measure the voltage between each voltage pin and ground (G) pin ( A to (G) and B to (G), and C to (G)) on the customer outlet.
- If the connector has five pins, measure the voltage between the neutral pin and ground pin. See Figure 3.
Did any voltage measure more than 1.0 V ac? Refer to Figure 1 or Figure 2 and Figure 3 for the location of the pins.
- Yes, inform the customer that one or more voltage pins on the customer receptacle measured greater than 1.0 V ac even though the circuit breaker is off. Do not continue until the voltage is less than 1.0 V ac.
- No, continue with the next task, Checking customer receptacle voltage pins with customer CB on (plug in).
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 