Nortel Networks Option 11C Mini Alternative AC-powered installation, Location of power outlets

Page 58 of 332 Chapter 3 — System and site requirements

Location of power outlets

The maximum distance between a power outlet and the system chassis depends on the length of the power cord. In North America, the power cord is 9 ft 10 in. (3000 mm). In countries outside North America, the power cord is 8 ft 2 in. (2490 mm).

Alternative AC-powered installation

If a dedicated panel cannot provide optimal conditions, use an Isolation Transformer with the following characteristics:

•120/208/240 VAC input, over-current protected at primary

•120/208/240 VAC available at secondary outputs, each circuit breaker-protected

•Completely isolate primary and secondary windings from one another

•Approved for use locally as a stand-alone user product (CSA, UL, or other locally recognized clear markings)

•Capable of providing power to all Option 11C Mini system equipment operating at the same time at full load

•Equipment not related to the Option 11C Mini system must not be powered from a transformer that provides service the Option 11C Mini system.

Uninterruptible Power Supply

For backup AC power, you can use an Uninterruptible Power Supply (UPS) to feed the Option 11C Mini. The power requirement for a UPS is 550 VA per system. The maximum power requirement for a Main Chassis and a Chassis Expander on the same breaker is 1100 VA. 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 a 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.

553-3021-209 Standard 3.00 April 2000