Tripp Lite SUTX20K Owner'S Manual Download

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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

Suggested Protective Device

SUTX20K

D-Curve 63A circuit breaker

SUTX40K

D-Curve 125A circuit breaker

• 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

Suggested 3-pole Breaker

SUTX20K

C-Curve 63A Breaker

SUTX40K

C-Curve 100A Breaker

• 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

SUTX20K

SUTX40K

AC Input Cable

8 AWG/6 mm²

4 AWG/16 mm²

Output Cable

8 AWG/6 mm²

4 AWG/16 mm²

Battery Input Cable

6 AWG/10 mm²

2 AWG/25 mm²

Tightening Torque

2 N·m

6 N·m

Input Breaker

40A (4-pole × 1)

100A (4-pole × 1)

Bypass Breaker

40A (4-pole × 1)

100A (4-pole × 1)

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 ( ) terminal of the battery terminal block.
• 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 ( ) and you require that the VNG of the UPS

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 ( ).