Tripp Lite NGI-S04C2 Owner's Manual page 16

The device is installed in a restricted-access location it has a separate
protective earthing terminal on the chassis that must be permanently
connected to earth ground to adequately ground the chassis and protect the
operator from electrical hazards.
Attention
The product should be mounted in an Industrial Control Panel and the ambient
temperature should not exceed 60°C (140°F).
Attention
A corrosion-free mounting rail is advisable.
When installing, make sure to allow for enough space to properly install the
cabling.
Wiring Power Inputs
You can use "Terminal Block (PWR)" for primary power and "Terminal Block (RPS)"
for secondary power source, to be a Redundant Power Input.
Top views of Terminal Block are shown in picture.
Warning
16