Nortel Meridian 1 Planning And Installation Manual page 61

Chapter 3 — System and site requirements
Uninterruptible Power Supply
For backup AC power, an Uninterruptable Power Supply (UPS) can be used
to feed the Option 11C Mini. The power requirement for a UPS is 550 VA per
system. Install the UPS according to the manufacturer's instructions.
Isolation transformer ground
The transformer ground must 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 Mini system
Make sure that the ground conductors inside the transformer are sized
correctly.
Receptacles
Receptacle requirements are as follows:
• When installed on the wall, receptacles must be installed within reach of
the chassis power cords.
• All receptacles served by the secondary must be of the isolated ground
type
• The ground prong of each outlet must be connected by an insulated
conductor to the system SPG.
If the transformer has an isolated secondary ground lug, use it as the SPG. If
it does not, use the chassis ground of the transformer as the Single Point
Ground.
Option 11C Mini Planning and Installation Guide
Page 41 of 590