Specifications

3-8 Main Cabinet and Power Box Grounding
Chapter 3 - Installation
Main Cabinet and Power Box Grounding
Before connection to AC power, the Cabinet must be connected to an Earth Ground in
conformance with the appropriate IEEE recommendations. An Earth Ground is required
for user safety and to minimize EMC interference.
To ensure proper system operation and for safety purposes, a good earth ground is
required. A metallic COLD water pipe usually provides a reliable ground. Carefully check
that the pipe does not contain insulated joints that could isolate the ground path. If
insulated joints exist, another earth ground source must be used or, if allowed, the joints
may be bridged.
An 18 AWG UL type 1015 or larger copper wire is recommended as the ground wire.
However, check the appropriate national or local codes for proper conductor type and
size. The wire should be kept as short as possible, it is recommended that the wire be no
longer than 1 meter (about 3.3 feet).
When the Power Box is installed with the Main Cabinet, the Ground wire should be
connected to the GND terminal located on the rear side of Power Box. Loosen the GND
terminal sufficiently to insert the Ground wire and re-tighten the terminal securely. Also
assure the Main Cabinet and Power Box fasteners are securely tightened.
When the Main Cabinet is installed without the Power Box, the Ground wire should be
connected to the GND terminal located on rear bottom left side of the Cabinet. Loosen
the terminal sufficiently to insert the Ground wire and re-tighten securely.
Figure 3-5: MCAB and Power Box Grounding
: Safety Earth Point
: Functional Earth Point