Ariz. Admin. Code § R14-2-2622 - Interconnection to a Secondary Spot Network System

A. A Secondary Spot Network System is a system that:

1. Simultaneously serves a Customer from three-phase, four-wire, low-voltage (typically 480V) circuits supplied by two or more network transformers which have low-voltage terminals that are connected to the low-voltage circuits through network protectors without ties to adjacent or nearby secondary network systems;

2. Has two or more high-voltage primary feeders that are either dedicated network feeders that serve only other network transformers, or non-dedicated network feeders that serve radial transformers in addition to the network transformers, depending on network size and design; and

3. Has automatic protective devices and fuses intended to isolate faulted primary feeders, network transformers, or low-voltage cable sections while maintaining uninterrupted service to the consumers served from the low-voltage circuits.

B. Because interconnecting a Generating Facility to a Secondary Spot Network System implicates technical requirements that are particular to the design and operational aspects of network protectors that are not required on radial systems, the Utility shall determine the process for interconnecting to a Secondary Spot Network System, subject to the following:

1. A Generating Facility shall not be interconnected to the load side of spot network protectors unless the Generating Facility uses an inverter-based equipment package and, together with the aggregated other inverter-based generation, does not exceed the smaller of 5% of the Secondary Spot Network System's maximum load or 50 kW; and

2. Interconnection of a Generating Facility shall not result in a Backfeed of a Secondary Spot Network System or cause unnecessary operation of any Secondary Spot Network System protectors.

Notes

Ariz. Admin. Code § R14-2-2622

Adopted by final rulemaking at 26 A.A.R. 473, effective 2/25/2020.