Checking the ground/earth path
Perform the ground/earth path checks using either “Procedure A (preferred in the USA)” on page 7 or
“Procedure B” on page 8. Procedure A is the preferred method in the USA if the proper equipment is
available.
The wall breaker should be OFF.
Procedure A (preferred in the USA)
This procedure checks for a ground/earth impedance of 1 ohm or less at the receptacle ground/earth pin
using any of the following:
• SureTest Model 61-164 Circuit Analyzer, P/N 39X8928 with accessories:
– SureTest Model 61-175 Ground Continuity Adapter, P/N 39X8929
– SureTest Model 61-183 Alligator Clip Adapter, P/N 39X8930 (for testing 208/220 volts)
• SureTest Model ST-1D with IG adapter, P/N 25F9715
• SureTest Model ST-1THD tester, P/N 25F9722
• ECOS C7106 tester (make sure the ECOS tester is Model C7106)
Use of the word "tester":
In the following procedure, the word "tester" refers to any of the devices listed above. Be certain to
follow the tester manufacturer’s instructions to perform the electrical tests.
Ground/Earth
4 pins
L1
L2
L3
Ground/Earth
5 pins
Neutral
L2 L3
L1
__ 1. Locate a "live" outlet near the receptacle that will be tested. The outlet selected must be derived
from the same power source as the receptacle to be tested.
Attention: Do not use a customer's receptacle with GFCI protection.
__ 2. Insert the tester into the outlet.
__ 3. Perform the impedance test as indicated in the instructions for the tester.
__ 4. Unplug the tester.
__ 5. Plug the tester into the ground test probe.
__ 6. Attach the alligator clip from this probe to the ground/earth pin of the receptacle to be tested.
__ 7. Reinsert the tester into the receptacle (you might need an extension cord).
__ 8. Repeat the test as specied in the tester instructions, looking for an indication of 1 ohm or less.
__ 9. If the connector has a metal shell or metal components, unplug the tester from the wall receptacle
and reconnect the alligator clip to the metal, then reinsert the tester and repeat the test. For more
information, refer to Safety Manual for IBM Service Personnel, or equivalent documentation for your
geography.
Chapter 1. Safety inspection ENG-7
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