IBM Multiprise 3000 S/390, Installation Manual

Page: 19 / 175

2 Checking the ground/earth path
Procedure B
This procedure checks for a ground/earth
resistance of one ohm or less at the receptacle
ground/earth pin using the CE meter.
The wall breaker should be OFF.
1. Using the CE meter, measure the
resistance from the ground/earth pin of the
receptacle to building ground/earth. The
reading should be one ohm or less.
2. For metal receptacle shells, also measure
the resistance from the ground/earth pin of
the receptacle to the metal shell. This
reading should be 0.1 ohm or less.
Note: Digital meters may give unstable resistance
readings if leakage current is flowing in the
building ground/earth circuit. If the reading
appears unstable, or is greater than one
ohm, contact your branch office installation
planning representative or field manager.
Chapter 1. Beginning the Installation
1-5