Specifications

Appendix A: Specifications for DEFINITY media gateways
414 Hardware Description and Reference for Avaya Communication Manager
If these grounds are not available, one of the following types of grounds can supplement the
water pipe ground:
● Other local metal underground systems or structures. Local underground structures such
as tanks and piping systems.
● Rod and pipe electrodes. A .63 inch (1.6 centimeter) solid rod or .75 inch (1.9 centimeter)
conduit or pipe electrode that is driven to a minimum depth of 8 feet (2.5 meters).
● Plate electrodes. Must have a minimum of 2 square feet (0.18 square meters) of metallic
surface exposed to the exterior soil.
The metal frame of the building, a concrete-encased ground, or a ground ring must supplement
a metallic underground water pipe.
Approved floor grounds
!
WARNING:
WARNING: If you can only access the approved ground from within a dedicated power
equipment room, then a licensed electrician must make the connections.
Approved floor grounds are grounds on each floor of a high-rise building. These grounds can be
connected to the ground terminal in the riser closet and to the cabinet equipment that are
single-point ground terminals. Approved floor grounds might include the following grounds:
● Building steel
● The grounding conductor for the secondary side of the power transformer that feeds the
floor
● Metallic water pipes
● Power feed metallic conduit that supplies panel boards on the floor
● A point that is specifically provided in the building design for grounding
Note:
Note: You must ensure that you electrically connect all protective grounds together to
form a single grounding electrode system.
Coupled bonding conductor
When you use a coupled bonding conductor (CBC) grounding in an AC-powered cabinet,
maintain a minimum space of 1 foot (0.3 meters) between the CBC power and other power and
ground leads.
In AC-powered systems, attach the single-point ground terminal block for the system on the AC
load or AC protector cabinet.