Liebert II manual Voltage Ratings and Power Source Configurations, Electrical Connections

Models: II

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3.0ELECTRICAL CONNECTIONS

All electrical connections should be installed only by a qualified (licensed) electrician. All wiring must comply with the National Electrical Code (NEC) and applicable local codes.

! CAUTION

Verify that all power circuits are de-energized and locked out before making electrical connections.

3.1Voltage Ratings and Power Source Configurations

Before making connections to the unit, verify that the unit model number and nameplate voltage rating are appropriate for connection to the intended power source. See Table 3 for voltage rating applications with typical power source configurations.

Surge Voltage Ratings—To obtain the suppression voltage ratings (SVRs), as obtained by Underwriters Laboratory, Incorporated, in accordance with the Standard for Safety, Transient Voltage Surge Suppressors (TVSS), Standard 1449, Second Edition, dated August 15, 1996, marked on this product, #2 AWG wire must be utilized to connect the unit to your facilities’ power grid. Connections made with conductors other that #2 AWG may result in different SVRs.

Circuit Ampacity Limitations—Representative samples of this product have been investigated by Underwriters Laboratories, Incorporated to withstand, without exposing live circuits or compo- nents at system voltages and fault currents of up to 200,000 AIC, as described in the Standard for Safety, Transient Voltage Surge Suppressor (TVSS), Standard 1449, Second Edition, dated August 15, 1996.

3.2Parallel Connection (see Figures 2 and 3)

With parallel connection, the length of the wiring to the Transient Voltage Surge Suppressor (TVSS) unit must be minimized for best performance. Wires should be as short and straight as possible.

To reduce the wiring impedance to surge currents, the phase, neutral (if required), and ground conductors are recommended to be twisted together and routed in the same raceway (conduit). Avoid any sharp bends in the conductors.

Wire Sizing—With parallel connection, the size of the wiring to the TVSS unit is independent of the protected circuit’s ampacity. Suggested wire size based on the unit’s transient surge current capabilities are show in the table below.

Table 2

Suggested wire and breaker size

 

 

 

 

 

Model Series

Outline Drawing

Wire Size

Breaker Size

 

 

 

 

SI016 –SI025 Wire Lugs

82010

8-1/0

40A

 

 

 

 

SI016 –SI025 Disconnect

82011

8-1/0

40A

 

 

 

 

S0320 –SI050 Wire Lugs

82012

4-1/0

80A

 

 

 

 

S0320 –SI050 Disconnect

82013

4-1/0

80A

 

 

 

 

SI060 –SI075 Wire Lugs

82014

4-1/0

80A

 

 

 

 

SI060 –SI075 Disconnect

82015

4-1/0

80A

 

 

 

 

SI100 Wire Lugs

82016

4-1/0

80A

 

 

 

 

SI100 Disconnect

82017

4-1/0

80A

 

 

 

 

 

NEC Articles 280-21 and 22 require surge arrestor connecting conductors to be at least #14 copper or #12 aluminum.

Overcurrent Protection—The TVSS unit conducts practically no current under normal opera- tion and conducts only very short duration transient surge currents.

External overcurrent protection is not specifically required by NEC Article 280 nor is it desired since it impedes the performance of the transient voltage surge suppressor. If fusing is required, please consult factory for recommendations.

4Electrical Connections

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Liebert II Voltage Ratings and Power Source Configurations, Electrical Connections, Parallel Connection see Figures 2

II specifications

Liebert II is a high-performance precision cooling system designed specifically for mission-critical applications, ensuring that data center facilities maintain optimal temperatures for sensitive equipment. As part of Emerson's extensive line of cooling solutions, the Liebert II is particularly valued for its reliability, efficiency, and adaptability.

One of the standout features of the Liebert II is its sophisticated cooling technology, which incorporates both chilled water and air-cooled systems. This dual capability allows it to operate effectively in a variety of environments, whether in a small server room or a large data center. The unit is engineered to deliver consistent cooling across different loads, catering to fluctuating demands characteristic of modern IT environments.

In terms of performance, the Liebert II boasts variable speed fans that adjust to the cooling requirements in real-time, thus maximizing energy efficiency. This feature not only reduces operational costs but also minimizes the carbon footprint of the facility. Furthermore, the system is designed with advanced electronic controls that offer precise temperature management, allowing for rapid response to any changes in operating conditions.

The Liebert II also includes state-of-the-art monitoring and control features. It supports integration with advanced Building Management Systems (BMS), providing operators with the tools to oversee performance metrics, detect potential issues before they escalate, and implement energy-saving strategies. This level of operational visibility is crucial for maintaining uptime in critical environments.

Another significant characteristic of the Liebert II is its modular design, which simplifies maintenance and scalability. Facilities can easily upgrade or expand the system as needs evolve, ensuring that the cooling solution can keep pace with technological advancements and increased loads. The design also promotes ease of access for service technicians, minimizing downtime during maintenance activities.

Finally, noise reduction is an important aspect of the Liebert II’s design. The system operates quietly, making it suitable for environments where noise levels must be kept at a minimum, such as offices adjacent to IT spaces.

In summary, the Liebert II stands out as a top choice for ensuring reliable precision cooling in data centers, thanks to its advanced technology, energy efficiency, modular design, and operational flexibility. These attributes position it as an essential component in the infrastructure of any modern facility relying on high-performance computing.