Liebert Packaged Power System Advantages Compared to Conventional, Built-Up Systems
2
L
IEBERT
P
ACKAGED
P
OWER
S
YSTEM
A
DVANTAGES
C
OMPARED
TO
C
ONVENTIONAL
,
B
UILT
-U
P
S
YSTEMS
Desirable Features
Conventional Built-Up Systems
Liebert Packaged Power System
Proven System
Design
No
. Each site is a one-of-a-kind installation.
“Design” depends on engineer and installer.
Yes
. Liebert power systems are complete,
proven-design, factory tested to ensure
consistent performance. Designed-in
distribution flexibility accommodates all
installation sites.
Agency Approved
Not as a system
. Even though listed
components may be used, site-fabricated
distribution is subject to acceptance by local
inspecting authorities.
Yes
. UL listing as a complete system is an
assurance of safety.
Factory Tested
No
. Testing of performance is done at the site,
if at all.
Yes
. Factory testing the complete system
ensures performance and safety of the system.
Power Quality
Improvement
Doubtful
. Because of the variables in design
and installation, site-fabricated distribution
does not consistently offer computer-grade
power isolation or ground systems.
Yes
. Because packaged power systems have
shielded isolation transformers close to the
load, they offer power line noise attenuation
and controlled grounding.
Computer-Grade
Grounding
Difficult
. Since site-fabricated distribution
seldom includes an isolation transformer in the
computer room, a local single point ground
system that minimizes common mode
disturbances is difficult to establish.
Yes
. The packaged power system with
isolation transformer automatically establishes
a local single-point ground for the critical load.
The power grounding point is the same as the
computer system grounding point, minimizing
common mode disturbances.
Secure Distribution
Possibly
. Only if the entire distribution panel is
dedicated to the computer and the panel is in
the computer room.
Yes
. Power distribution panel is in the
computer room. Access is limited to authorized
personnel.
Circuit Identification
Possibly
. Circuit number and receptacle
references might be supplied, depending on
the installing electrician and available
information.
Yes
. Identification tags adjacent to each circuit
breaker provide circuit identification and
description of load served. Each cable is
tagged with circuit number and cable length.
Monitoring
Seldom
. Some add-on monitoring systems are
available, but monitoring also depends on the
installing electrician and available information.
Yes
. Built-in power parameter monitoring,
alarm, and control capabilities are standard in
packaged power systems.
Ease of Installation
No
. All site-fabricated distribution wiring
becomes part of premises wiring.
Yes
. A packaged system requires only a single
connection to the premises wiring.
Easy System
Expansion
No
. Conduit installation and wire pulling is time-
consuming, and can hamper operations while
in progress.
Yes
. New cable(s) can be routed quickly with
minimal disruption.
Easy System
Rearrangement
No
. Site-fabricated distribution cannot be easily
rearranged. Old conduit and wiring must be
removed and new installed.
Yes
. Even after major equipment
rearrangement, redistributing power from
packaged systems becomes a simple matter of
re-routing the flexible interconnecting cables.
Easy To Move
No
. New distribution must be built at the new
site and old conduit and wiring usually must be
removed from the former site.
Yes
. The package is easily moved with the
computer system to the new site.
Summary of Contents for Liebert PPC 15-30 kVA
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