Nortel BCM200 Installation And Maintenance Manual page 143

Chapter 9 Connecting the cables 143
Warning: Qualified persons to service the system
The installation and service of this unit must be performed by service personnel with the
appropriate training and experience. Service personnel must be aware of the hazards of
working with telephony equipment and wiring. They must have experience in techniques
that minimize any danger of shock or equipment damage.
Warning: Leakage currents
Service personnel must be alert to the possibility of high leakage currents becoming
available on metal system surfaces during power line fault events on network lines. These
leakage currents normally safely flow to protective earth ground through the power cord.
However, if the ac power is unplugged prior to disconnecting the cables from the front of
the base function tray, this hazard can occur.
System shutdown: You must disconnect the MBM cables from the system before
disconnecting the power cord from a grounded outlet.
System startup: You must reconnect the power cords to a grounded outlet before
reconnecting the cables to the MBMs.
Danger: Electrical shock hazards
Electrical shock hazards from the telecommunications network and ac mains are possible
with this equipment. To minimize risk to service personnel and users, the BCM system
must be connected to an outlet with a third-wire ground. In addition, all unused slots must
have blank faceplates installed. The covers on all units must be in place at the completion
of any servicing.
Warning: Electrical shock warning
The BCM MBMs have been safety approved for installation into BCM main units and
expansion units. It is the responsibility of the installer and user to ensure that installation
of the BCM hardware does not compromise existing safety approvals.
BEFORE YOU OPEN the BCM main unit or expansion unit, ensure that the network
cables are unplugged and the unit is then disconnected from the AC power source.
Station MBMs: The ports on these MBMs are meant to be connected only to approved
digital telephones and peripherals with the proper cables on a protected internal wiring
system.
Do not connect any telephones to wiring that runs outside of the building.
Read and follow the installation instructions carefully.
BCM200/400 4.0 Installation and Maintenance Guide