Nortel Networks BCM1000 - Manual (Page 12)

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Only qualified persons should service the system.
The installation and service of this hardware is to be performed only by service personnel
having appropriate training and experience necessary to be aware of hazards to which
they are exposed in performing a task and of measures to minimize the danger to
themselves or other persons.
Electrical shock hazards from the telecommunication network and AC mains are possible
with this equipment. To minimize risk to service personnel and users, the Business
Communications Manager system must be connected to an outlet with a third-wire Earth.
Service personnel must be alert to the possibility of high leakage currents becoming
available on metal system surfaces during power line fault events near network lines.
These leakage currents normally safely flow to Protective Earth via the power cord.
Therefore, it is mandatory that connection to an earthed outlet is performed first and
removed last when cabling to the unit. Specifically, operations requiring the unit to be
powered down must have the network connections (exchange lines) removed first.