Nortel Meridian 1 option 11C Planning And Installation Manual page 46

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If optimal conditions cannot be provided with a dedicated panel, the use of an
Isolation Transformer with the following characteristics it is recommended:
• 120/208/240 V input, over-current protected at primary
• 120/208/240 V available at secondary outputs, each
circuit breaker-protected
• Primary and secondary windings must be fully isolated from one another
• Certified for use locally as a stand alone user product (CSA, UL, or other
locally recognized markings apparent)
• Capable of providing power to all Option 11C system equipment
operating simultaneously at full load
• Equipment unrelated to the Option 11C system must not be powered
from a transformer serving the Option 11C system.
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It is recommended that the transformer ground have the following
characteristics:
• Separate grounds for primary and secondary windings rather than
common ground
• A "clean" and permanent SPG reference at the transformer secondary for
the Option 11C system.
In addition, verify the ground conductors inside the transformer to ensure
they are sized appropriately.
Note: Do not ground the transformer or Option 11C system to structural
steel or water pipes. Connect them to a known building ground reference.
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