User's Manual

Sample Sweeps Output
TDC-0971-011 CCU 100 and Repeater 100 Installation Guide 107
Proprietary and Confidential
Collector Sites with Indoor Itron TCU / CCU Equipment
When grounding equipment for collector sites where the Itron TCU / CCU equipment is
located indoors include the installation on an interior ground ring (halo) installed
approximately 6 inches below the ceiling or 8 feet above the finished floor, whichever is
lower. The interior ground halo cable must be a minimum of No. 2 AWG, stranded
copper with moisture resistant green insulation. The purpose of the interior halo ground
ring is to provide a convenient grounding and bonding point for all miscellaneous metallic
objects to reduce step and touch potential. All miscellaneous metallic objects, such as
metal door frames, air conditioners, cable racks, metallic conduits, and battery stands
must be bonded to the interior ground halo with No. 6 AWG cable. Bond both ends of the
ground halo conductor to the MGB.
Note Follow this bonding specification in existing shelters, if an interior
halo is present. Most indoor Itron TCU / CCU equipment has grounding
attachment points at the bottom of the cabinets. In these cases, it is not
possible to have all ground paths flat or downward. Install all ground leads
in accordance with manufacturer’s specification.
RF Components Protection (Coax)
RF transmission lines from the antenna structure to the shelter or building must be
grounded (earthed). Upon entering the shelter or building, all RF transmission lines must
route through coaxial RF- type Surge Protection Devices (SPDs). This includes sample
port (test) and unused spares.
To ground RF transmission lines
1. Bond the coaxial RF devices to the single point ground.
2. Locate the SPD within the shelter, room or equipment area.
It must be a maximum distance of 2 feet from the transmission line entrance point
into the shelter, room or equipment area, as per the figure, below.
3. Install coaxial cable SPDs at or within the entry port if the entry port is located in the
wall of the shelter, equipment room or area.
4. If the equipment room or area is located within a larger building (such as a high rise
structure), install and ground the SPDs at the coaxial entry point into the structure. In
this application, the transmission lines must also have SPD installed and grounded at
the point where they enter the equipment room or area.