Liebert Packaged Power System Advantages Compared To Conventional, Built-Up Systems - Emerson Liebert PPC 15-30 kVA Technical Data Manual

L P
IEBERT ACKAGED
B -U S
UILT P YSTEMS
Desirable Features
Proven System
Design
Agency Approved
Factory Tested
Power Quality
Improvement
Computer-Grade
Grounding
Secure Distribution
Circuit Identification
Monitoring
Ease of Installation
Easy System
Expansion
Easy System
Rearrangement
Easy To Move

Liebert Packaged Power System Advantages Compared to Conventional, Built-Up Systems

P S
OWER YSTEM
Conventional Built-Up Systems
No. Each site is a one-of-a-kind installation.
"Design" depends on engineer and installer.
Not as a system. Even though listed
components may be used, site-fabricated
distribution is subject to acceptance by local
inspecting authorities.
No. Testing of performance is done at the site,
if at all.
Doubtful. Because of the variables in design
and installation, site-fabricated distribution
does not consistently offer computer-grade
power isolation or ground systems.
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.
Possibly. Only if the entire distribution panel is
dedicated to the computer and the panel is in
the computer room.
Possibly. Circuit number and receptacle
references might be supplied, depending on
the installing electrician and available
information.
Seldom. Some add-on monitoring systems are
available, but monitoring also depends on the
installing electrician and available information.
No. All site-fabricated distribution wiring
becomes part of premises wiring.
No. Conduit installation and wire pulling is time-
consuming, and can hamper operations while
in progress.
No. Site-fabricated distribution cannot be easily
rearranged. Old conduit and wiring must be
removed and new installed.
No. New distribution must be built at the new
site and old conduit and wiring usually must be
removed from the former site.
A C
DVANTAGES OMPARED TO
Yes. Liebert power systems are complete,
proven-design, factory tested to ensure
consistent performance. Designed-in
distribution flexibility accommodates all
installation sites.
Yes. UL listing as a complete system is an
assurance of safety.
Yes. Factory testing the complete system
ensures performance and safety of the system.
Yes. Because packaged power systems have
shielded isolation transformers close to the
load, they offer power line noise attenuation
and controlled grounding.
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.
Yes. Power distribution panel is in the
computer room. Access is limited to authorized
personnel.
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.
Yes. Built-in power parameter monitoring,
alarm, and control capabilities are standard in
packaged power systems.
Yes. A packaged system requires only a single
connection to the premises wiring.
Yes. New cable(s) can be routed quickly with
minimal disruption.
Yes. Even after major equipment
rearrangement, redistributing power from
packaged systems becomes a simple matter of
re-routing the flexible interconnecting cables.
Yes. The package is easily moved with the
computer system to the new site.
2
C
ONVENTIONAL
Liebert Packaged Power System
,