4. Coat all touching surfaces before connecting.
5. Install anti-oxidant compound per manufacturer’s instructions.
6. Make all grounding connections, interior and exterior, with two-hole lugs using an
anti-oxidation compound prior to crimping.
Grounding Rooftop Network Devices
A rooftop network device refers to a site where Itron’s site is built on an existing building,
regardless of whether Itron’s TCU / CCU equipment is located on the rooftop or inside
the building. Human occupancy of buildings requires that safety is a primary
consideration. Network device grounding must be designed to ensure that any potential
electric discharge is safely carried to earth and not dissipated through the structure.
To ground rooftop network devices
1. Install the MGB at a rooftop site at the Itron TCU / CCU equipment location. This
acts as the primary point where all Itron grounding connects to the main grounding
system.
2. Install the MGB flat, if necessary, to ensure that no paths to ground turn upward to
allow connection to the top of the MGB.
3. Properly ground the MGB at a roof top site by two separate electrically continuous
paths to ground where practical as determined by the responsible Itron Project
Engineer. The paths can be in order of preference:
To ground building steel and existing building lightning protection or
grounding systems
1. The first path to ground includes bonding the MGB to building steel with a 4/0 AWG
conductor. Consider only building steel that has been verified by the AE to be
continuous to earth and appropriate for grounding.
2. Install the second path to ground by bonding the MGB to the existing building
lightning or grounding system with 4/0 AWG conductor.
To ground building steel and one 4/0 AWG down conductors
1. The first path includes bonding the MGB to building steel with a 4/0 AWG
conductor.
2. Provide the second path by installing a 4/0 AWG down conductor from the MGB to
the ground rod or chemical ground rod. Use the water pipe main entrance if the
ground rod or chemical ground rod are not available. Do not use AC service panel
grounds.
3. If the Itron TCU / CCU equipment is located on the ground floor or in the basement,
the MGB may be connected directly to both building steel and the water main or
ground rod.
TDC-0971-011 CCU 100 and Repeater 100 Installation Guide 111
Proprietary and Confidential
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