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This figure shows the elements in a reliable power
source for a computer system. The basic principles
show!l apply worldwide.
Incoming 3-phase power
N
from service entrance or
separately derived system
with appropriate
overcurrent protection
and suitable ground
G
t---
(service entrance or
building ground)
legend
Phase wires and neutral
Grounding
Terminal Bar
Bonded to
Enclosure
Building Steel or
Metallic Cold Water
Pipe
Insulated green wire ground
Supplemental ground. used whenever
conduit would otherwise be the only path
to ground
Remotely Operated
Service Disconnect
(Power can be remotely disengaged
by an emergency switch located near
the operator console and by other
switches located near main exits.)
Neutral
--+-f-
Bus
-f+-~f--+-
Circuit Breakers
208/240 (230)V
3·Phase
(of appropriate size)
Branch
-Circuits
1·Phase
208/240 (230)V
1-Phase
Customer-supplied
receptacles/connectors
that comply with
local codes
lFor loads requiring a neutral. Attach computer/data processing equipment only.
Figure &-2. A Typical Power Distribution System that I. Grounded Properly
Electrical Requirements
5-3
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