Liebert II - Manual (Page 8)

4 Electrical Connections
3.0 E
LECTRICAL
C
ONNECTIONS
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.
3.1 Voltage 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.
3.2 Parallel 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.
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.
!
CAUTION
Verify that all power circuits are de-energized and locked out
before making electrical connections.
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