Wiring; Precautions Prior To Wiring - Tripp Lite SUTX20K Owner's Manual

3. Installation and Wiring

3.6 Wiring

3.6.1 Precautions Prior to Wiring

• The wiring must be performed by qualified professional personnel.
• Before wiring or making any electrical connection, make sure the power supplied to the input and output of the UPS is completely cut
off and the internal battery fuse holders are open.
• When connecting the UPS to the utility AC power and bypass source, protective devices and 4-pole connectors must be installed. The
protective devices and 4-pole contactors must use approved components that meet safety certifications. Please refer to the following
table for suggested protective devices. For the installation of the protective devices and 4-pole contactors, see Figures 3-10~3-18.
UPS
SUTX20K
SUTX40K
• When connecting the critical loads to the UPS, a 3-pole EN 60947-2 certified breaker must be installed between them. Refer to the
table below
UPS
SUTX20K
SUTX40K
• Check that the size, diameter, phase and polarity of each cable connecting to the UPS is correct. For the specifications of input/output
cables and circuit breakers, refer to Table 3-1.
Table 3-1: Specifications of Input/ Output Cables and Circuit Breakers
AC Input Cable
Output Cable
Battery Input Cable
Tightening Torque
Input Breaker
Bypass Breaker
Notes:
1. In accordance with local electrical codes, install a suitable conduit and bushing.
2. Please refer to national and local electrical codes for acceptable non-fuse breakers and cable size.
3. Cables with PVC material and with temperature resistance up to 105°C (201°F) are suggested.
4. Make sure that the input/output cables are locked tightly.
• When connecting with the external battery cabinet, confirm the polarity. Do not reverse the polarity.
• The grounding cable of the external battery cabinet must be connected to the (
• Installer should consider the maximum current and wiring gauge that may be required for future expansion of parallel configurations.
• The UPS default setting is single input. Should the UPS be changed to dual input or hot standby redundancy configuration, first contact
qualified service personnel. Check whether the electric potential of the neutral line (N) of the bypass source is the same as that of the
neutral line (N) of the main AC source. If they do not share a common neutral line system, add an isolation transformer to the bypass
source.
• The input of the UPS must be a Y connection, and the neutral line (N) must be connected to avoid UPS failure. Do not connect the
neutral line (N) of the UPS with the ground terminal (
• If there is a floating voltage between the input power's neutral (N) and the ground (
should be zero, it is suggested an installation transformer be installed in front of the UPS input side and the UPS neutral (N) be
connected with the ground (
6 AWG/10 mm²
40A (4-pole × 1)
40A (4-pole × 1)
).
).
Suggested Protective Device
D-Curve 63A circuit breaker
D-Curve 125A circuit breaker
Suggested 3-pole Breaker
C-Curve 63A Breaker
C-Curve 100A Breaker
SUTX20K
8 AWG/6 mm²
8 AWG/6 mm²
2 N·m
) terminal of the battery terminal block.
) and you require that the VNG of the UPS
10
SUTX40K
4 AWG/16 mm²
4 AWG/16 mm²
2 AWG/25 mm²
6 N·m
100A (4-pole × 1)
100A (4-pole × 1)