IBM Multiprise 3000 S/390, Installation Manual

Page: 17 / 175

Checking Building Power
1 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/earthing
checks below. Improper wiring or
grounding/earthing
could place dangerous voltage on the
metal shell.
If any of the conditions are not as
described, STOP. Contact the customer
to have improper voltage or impedance
conditions corrected before proceeding.
The receptacle the customer uses to supply power
to the frames will be tested in the following steps.
Perform the following AC voltage checks with the
wall breaker OFF.
1. Using the CE meter, check to be sure there
is no ac voltage between each phase pin
and the ground/earth
pin (and receptacle shell, if metal).
2. Using the CE meter, check to be sure there
is no ac voltage from receptacle
ground/earth to building ground/earth
(water pipe, building steel, grounded raised
floor panels, etc.). For metal receptacle
shells, check for no ac voltage from the
receptacle ground/earth
pin to the metal shell.
Chapter 1. Beginning the Installation
1-3