Int-Pip9 Utility Power And Battery Power Units - IBM iSeries Series Hardware Problem Analysis And Isolation

9. For systems with more than one unit, the ground wire for each must not be connected from one
receptacle to the next in a string. Each unit must have its own ground wire, which goes to the power
source.
10. The grounding wires must be insulated with green (or green and yellow) wire at least equal in size to
the phase wires. The grounding wires also should be as short as possible.
11. If extension-mainline power cables or multiple-outlet power strips are used, they must have a
three-wire cable. One of the wires must be a ground conductor. The ground connector on the plug
must not be removed. This applies to any extension mainline power cables or multiple-outlet power
strips that are used on the server. It also applies for attaching devices such as personal computers,
workstations, and modems.
Note: Check all extension-mainline power cables and multiple-outlet power strips with an ECOS
tester and with power that is applied. Ensure that no wires are crossed (for example, a ground wire
crossed with a wire that has voltage on it).
12. For a diagram of grounding in a typical power distribution system, see Appendix C in the Physical
Planning Reference.
This ends the procedure.
INT-PIP9 Utility power and battery power units: For use by authorized service providers.
Use this procedure to check the ac electrical power for the system.
DANGER
An electrical outlet that is not correctly wired could place hazardous voltage on metal parts of the system or
the products that attach to the system. It is the customer's responsibility to ensure that the outlet is
correctly wired and grounded to prevent an electrical shock. (RSFTD201)
1. Have an installation planning representative or an electrician (when necessary), perform the
following steps.
2. Power off the iSeries system and the power network branch circuits before performing this procedure.
3. Read Electrical Safety for IBM Service Representatives, S229-8124.
4. To ensure the safety of personnel, all electrical wiring in the United States must meet National
Electrical Code requirements.
5. Check ALL system receptacles to ensure that each is wired correctly. This includes receptacles for
the iSeries system and all equipment that attaches to the iSeries system-including workstations. Do
this to determine if a wire with primary voltage on it has been swapped with the ground wire, causing
an electrical shock hazard. Use the procedures for checking receptacles in Electrical Safety for IBM
Service Representatives, S229-8124.
6. When three-phase voltage is used to provide power to the iSeries system, correct balancing of the
load on each phase is important. Each unit in the iSeries system uses only two of the three phases.
Therefore, the units should be connected so that all three phases are used equally. Use the following
as a guide to help balance the phases:
v Connect a unit across phases A and B
v Connect a unit across phases B and C
v Connect a unit across phases A and C
v Continue in this sequence for additional units
7. The power distribution neutral must return to the "separately derived source" through an insulated
wire that is the same size as the phase wire or larger.
Note: "Separately derived source" is defined in "INT-PIP8 Grounding" on page 110, step 8 (See page
111).
8. The iSeries system and its attached equipment should be the only units that are connected to the
power distribution network that the system gets its power.
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iSeries: iSeries Server 270, 800, 810, 820, 825, 830, 840, 870, 890, SB2, and SB3 Hardware Problem Analysis and Isolation