Specifications

Issue 6 February 2007 419
Sneak current protection
Extraneous power induces sneak current protection to protect building wiring with fuses. The
fuses protect wiring between the network interface and trunk circuits. The fuses also protect the
circuit packs.
All incoming trunks and outgoing trunks and off-premises station lines pass through the sneak
fuses. 507B sneak fuse panels are installed on the system side of the network interface.
Sneak current protectors must be either UL-listed or CSA-certified or must comply with local
safety standards. Sneak current protectors must have a maximum rating of 350 milliamperes
(mA) and a minimum voltage rating of 600 volts, or as required by local regulations.
Lightning protection
A coupled bonding conductor (CBC) in the cabinet ground wiring protects the system from
lightning. The CBC runs adjacent to wires in a cable and causes mutual coupling between itself
and the wires. The mutual coupling reduces the voltage difference between ground and the
switch.
Ensure that the CBC connects to a telecommunications cable that is firmly connected to an
approved ground. In multiple-story buildings, you must connect the CBC to an approved ground
at each floor.
The CBC can be any of the following configurations:
● a 10 AWG (5.3 millimeters2/2.6 millimeters) ground wire,
● a continuous cable sheath that surrounds wires within a cable, or
● six unused pairs of wire within a cable that are twisted and soldered together.
The CBC connects from the cabinet single-point ground bar in an AC-powered cabinet or the
ground discharge bar in a DC-powered cabinet to the terminal bar at the cross-connect field.
When there is an auxiliary cabinet, a 6 AWG (13.3 millimeters
2
/4.1 millimeters) wire connects
the system cabinet single-point ground block to the Auxiliary cabinet ground block. The ground
wire routes as closely as possible to the cables that connect the system cabinet to the Auxiliary
cabinet.
If equipment is not present in the Auxiliary cabinet, you must preserve ground integrity. Plug the
power supply for this equipment into one of the two convenience outlets on the rear of the
MCC1. The convenience outlets are fused at 5 A. A dedicated maintenance terminal plugs into
the other convenience outlet.
Earthquake protection
For earthquake or disaster bracing, the cabinets bolt to the floor. Other areas might require
additional bracing. Contact your Avaya representative for earthquake requirements at the
location of the system installation.