Vodavi STARPLUS Triad XTS, Installation Manual

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KSU Installation 3-9
Chapter 3 - System Installation
KSU Grounding
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.
A #14 insulated AWG or larger copper wire should be used between the ground source and
the KSU. The wire should be kept as short as possible. It is recommended that the wire be no
longer than 25 feet.
Figure 3-5: Earth Cable between KSU and External RGU
Grounding Instructions
1. Remove about 1½ inches of insulation from both ends.
2. Attach one end of the wire to the Ground Lug on the lower left side of the Cabinet 0 by
inserting the wire under the lug screw and tightening the screw securely.
3. Attach the other end of the wire as appropriate to the ground source.
4. Take a DC resistance reading and an AC Volt reading between the chassis ground point
(cold water pipe) and AC ground (third wire AC ground).
The limit is 1V AC and 5 Ohms DC resistance. If a higher reading is obtained, choose a
different chassis ground point and repeat this step until a suitable ground point is found.
Grounding to an electrical conduit is NOT considered a good ground!