Checking the receptacle for wiring errors
DANGER: If the receptacle has a metal shell, do not touch the shell until you have completed the
voltage and grounding checks. Improper wiring or grounding could place dangerous voltage on the
metal shell. If any of the conditions are not as described,
. Ensure the improper voltage or
impedance conditions are corrected before proceeding. (D003)
STOP
The receptacle the customer uses to supply power to the frames will be tested in the following steps.
Note: The following graphics represent a customer's 3-phase branch circuit IEC 60309 compliant female
connectors. These graphics do not apply to Single-phase power line cords, and may not apply if the
customer used their own different connector/plug set with IBM's cut-end power line cords.
Ground/Earth
4 pins
L1
L2
L3
Ground/Earth
5 pins
Neutral
L2 L3
L1
Perform the following AC voltage checks on all of the receptacles that the customer uses to supply power
to the frame.
__ 1. Verify that the wall breaker is set to the OFF position.
__ 2. PDU power
• Carefully probe the PDU outlets to verify that all power is turned off.
BPA power
• Using the digital voltage meter, check to be sure that there is no AC voltage between each phase
pin and the ground/earth pin (and metal receptacle components).
__ 3. Using the digital voltage meter, check to be sure that there is no AC voltage from receptacle ground/
earth to building ground/earth (water pipe, building steel, etc.). Grounded raised floors might not be
an acceptable building ground/earth. A grounded raised floor is acceptable if the following is true:
• It is bonded to building steel
• It is a bolted stringer design
• The stringer system is not corroded.
For metal receptacle shells or shells with metal components, check for no AC voltage from the
receptacle ground/earth pin to the metal.
ENG-6 IBM: 3931 Safety Inspection
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