AC Power Grounding Connections
In accordance with the National Electric Code, Article 250 or appropriate local codes,
bond the AC power neutral to the Master Ground Bar (MGB-1) Producer (P) section.
Refer to Section 3.2.1 of NP-312-202, Interior Grounding System Design, for more
information.
Utility Provided AC Power Transformer Neutral Grounding
The neutral of the distribution transformer is grounded by the power company. It is
important that the transformer ground not be connected to any part of the building or
tower ground ring. It should be grounded using its own ground rod. This reduces any
neutral currents that might flow in the site ground system.
Warning If the transformer is located near the building, connect the
transformer ground directly to the BGR.
Cable Entrance Facilities
The MGB must be used for the single reference ground for all interior grounds.
To ground cable entrance facilities
1. Install a copper entrance TVSS at the entrance of the copper cable into the building
space.
2. Bond all shielded cabling entering the building envelope to the MGB as soon as it
enters the building. Ideally, these cables need to enter near (within three feet) of the
MGB.
Note For all dielectric fiber cables, there is no requirement for bonding to the MGB,
and therefore, no requirements for these cables to enter within 3 feet of the MGB.
3. Bond the sheaths of the copper phone cables, fiber cables, and coax cables to the
MGB.
4. If the cable entrance is a distance away, then install and bond a separate terminal
Fiber/Copper Ground Bar (FCGB).
5. The shields of all low voltage shielded control cable, where the cable is connected to
a device outside the building and to a controller inside the building, must be grounded
at the device outside the building.
6. Install a TVSS for all cables (including copper and low voltage shielded control
cables) entering the building.
7. Ground the TVSS to the MGB if it is within a short distance.
8. If the TVSS is a distance from the MGB, bond it to earth (for example, building steel
or dedicated ground rod).
Note Any conductor in a continuous grounded metal conduit does not require a
TVSS be installed.
118 TDC-0971-011 CCU 100 and Repeater 100 Installation Guide
Proprietary and Confidential
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