Procedure
- Measure the voltage between each pair of voltage pins on
the female connector on each mainline power cable. Also, measure the
voltage between each voltage pin (for three phase A , B ,
and C or
for single phase A and B ) and
the ground pin on each mainline power cable. Refer to Figure 1 or Figure 2. For the top exit line
cord feature, refer to Figure 3 and Figure 4.
Did any voltage measure more than 1.0 V ac?
- Yes, inform the customer that one or more voltage pins on the customer supply 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 Checking customer voltage with customer CB on (wired).
Figure 1. Three-phase delta mainline power connector at DC-UPS end
Figure 2. Single phase mainline power connector
Figure 3. Three phase mainline power connector (top exit line cord feature)
Figure 4. Single phase mainline power connector (top exit line cord feature)