36.02'

FFE =

67.17

FFE =

67.50

66'

2" GRAVEL DRIVEWAY -

EXTEND FROM EXISTING

DRIVE AS SHOWN - 14'

WIDE TYP.

EXISTING METAL

BUILDING TO REMAIN

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TO REMAIN

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ROUTE AROUND BUILDING TO POINT OF ENTRY

2" WATER U.G. -

ROUTE LINE TO AVOID

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1" WATER

U.G.

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HB

HB

14' - 4"25' - 8"

NOTE:

THERE ARE NO PROPERTY LINES OR BEARINGS AVAILABLE

BEYOND THOSE PROVIDED UPON WHICH TO BASE THE

LOCATION OF THIS RESIDENCE. GENERAL CONTRACTOR

SHALL STAKE OR MARK THE BUILDING CORNERS IN THE

PROPOSED LOCATION RELATIVE TO EXISTING FENCE LINES

AND OBTAIN CONSENT FROM THE GOVERNMENT REGARDING

THE FINAL LOCATION OF THE IMPROVEMENTS.

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DATE:

REVISIONS:

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GENERAL SITE NOTES:

1. SURVEY BOUNDARY AND TOPOGRAPHICAL INFORMATION WAS

PROVIDED BY THE U.S. FISH AND WILDLIFE SERVICE. WSM ARCHITECTS

TAKES NO RESPONSIBILITY FOR THE ACCURACY OF THE INFORMATION

PROVIDED.

2. THE CONTRACTOR SHALL COORDINATE ALL SITE WORK, GRADING,

EARTHWORK, & CLEARING WORK FOR THIS PROJECT WITH ALL

DRAWINGS & SPECIFICATIONS.

3. ANY EXISTING UTILITY, LIGHTING FIXTURES/WIRES OR OTHER MATERIAL,

WHETHER SPECIFICALLY IDENTIFIED OR NOT, SHALL BE PROTECTED

THROUGHOUT THE COURSE OF CONSTRUCTION, UNLESS OTHERWISE

IDENTIFIED FOR DEMOLITION OR MODIFICATION.

4. ANY UTILITY OR OTHER BUILDING COMPONENT THAT IS INTERRUPTED OR

DAMAGED DURING CONSTRUCTION SHALL BE RETURNED TO SERVICE.

5. THE CONTRACTOR SHALL BE RESPONSIBLE FOR OBTAINING ALL

REQUIRED PERMITS.

6. THE CONTRACTOR SHALL REVIEW & COORDINATE THE WORK

REQUIRED ON ALL SITE PLANS, CIVIL PLANS, & BUILDING PLANS.

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ROOF LAYOUT PLAN

1/4" = 1'

6"X6" NEMA 3R JUNCTION BOX

AND CONDUIT PENETRATION.

EQUIPMENT SCHEDULE

TAG DESCRIPTION PART # NOTES

1 PV MODULE

TRINA SOLAR

TSM-PDO05.05

BLACK, MULTICRYSTALINE

2 JUNCTION BOX 6"X6" NEMA 3R

3 COMBINER BOX SMA SBCB-6

WALL-MOUNTED NEXT TO

INVERTER

4 INVERTER SMA 7000TL-US

TRANSFORMERLESS,

INTEGRAL DC DISCONNECT

5 DC METER

TEP METER IN TEP SUPPLIED

SOCKET

6 AC DISCONNECT

60A, 240V, NEMA 1

7 SERVICE PANEL

200A BUS, 200A MAIN

BREAKER

TRINA TSM-PDO05.05 PV MODULE, TYPICAL.

TRINA TSM-PDO05.05

PV STRING, 11 MODULES

PER STRING

TRINA TSM-PDO05.05

PV STRING, 11 MODULES

PER STRING

TRINA TSM-PDO05.05

PV STRING, 11 MODULES

PER STRING

COMBINER BOX

15A

DC

AC

INVERTER

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AC DISCONNECTPV METER SERVICE PANEL

40A/2

200A

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G

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TO TRICO

PV MODULES @ STC

MANUFACTURER TRINA SOLAR

MODEL TSM-PDO05.05

MPP CURRENT (A)

8.37

MPP VOLTAGE (V)

30.5

Voc (V)

38.1

Isc (A) 8.88

MAX SERIES FUSE

(A)

MAX POWER (W)

MAX SYSTEM

VOLATAGE (V)

INVERTER RATING

MANUFACTURER SMA

MODEL 7000TL-US

MAX INPUT

CURRENT (A)

30.0

MAX INPUT

VOLTAGE (V)

MAX OUTPUT

POWER (W)

MAX OUTPUT

CURRENT (A)

29.2

OUTPUT VOLTAGE

(V)

MAX POWER (W)

MAX VOLTAGE (V)

DC DISCONNECT PLACARD:

PHOTOVOLTAIC DC DISCONNECT

RATED MPP CURRENT 25.11 A

RATED MPP VOLTAGE 336 V

MAX SYSTEM VOLTAGE 419.1 V

SHORT CIRCUIT CURRENT 26.64 A

AC DISCONNECT PLACARD:

PHOTOVOLTAIC AC DISCONNECT

WARNING:

ELECTRIC SHOCK HAZARD.

DO NOT TOUCH TERMINALS.

TERMINALS MAY BE ENERGIZED ON

LINE AND LOAD SIDES WHEN IN THE

OPEN POSITION.

3 4

J-BOX

2 3

4 4 4

CONDUIT AND CONDUCTOR SCHEDULE

TAG CONDUCTOR TYPE AWG # COND. CONDUIT FILL NOTES

PV WIRE/USE-2

BARE COPPER

N/A N/A

PV MODULES ARE

CONTIGUOUS AND NO

CONDUIT IS REQUIRED

THWN/THWN-2

BARE COPPER

1" EMT 18%

3 STRINGS PLUS

EQUIPMENT GROUND

THWN/THWN-2

BARE COPPER

3/4" EMT 25%

DC +, DC -, EQUIPMENT

GROUND

THWN/THWN-2

BARE COPPER

1" EMT 21%

L1, L2, N, EQUIPMENT

GROUND

CONDUCTOR SIZING

PV JUNCTION BOX - COMBINER BOX

WIRE GAUGE 10 AWG

RATED AMPACITY PER

NEC 310.16

40 A

DERATE AMBIENT

TEMPERATURE

62 °C

DERATE FACTOR FOR

TEMPERATURE

0.58

DERATE FOR

CONTINUOUS DUTY

0.8

DERATE FOR 4-6

CONDUCTORS

0.8

DERATED AMPACITY 15 A

MAX Isc FROM STRINGS 8.88 A

CONDUCTOR SIZING

COMBINER BOX - INVERTER

WIRE GAUGE 8 AWG

RATED AMPACITY PER

NEC 310.16

50 A

DERATE AMBIENT

TEMPERATURE

50 °C

DERATE FACTOR FOR

TEMPERATURE

0.82

DERATE FOR

CONTINUOUS DUTY

0.8

DERATED AMPACITY 32.8 A

MAX INPUT CURRENT 25.11 A

CONDUCTOR SIZING

INVERTER - SERVICE PANEL

WIRE GAUGE 6 AWG

RATED AMPACITY PER

NEC 310.16

65 A

DERATE AMBIENT

TEMPERATURE

50 °C

DERATE FACTOR FOR

TEMPERATURE

0.82

DERATE FOR

CONTINUOUS DUTY

0.8

DERATED AMPACITY 42.64 A

FUSE/BREAKER SIZING

INVERTER OUTPUT

VOLTAGE

240 VAC

INVERTER OUTPUT

CURRENT

29.2 A

REQUIRED BREAKER 36.5 A

NEXT STANDARD

BREAKER SIZE

40 A

SERVICE PANEL MAIN

BREAKER/BUS

200 A

INVERTER SUPPLY 18.25%

NOTES:

1. PV ARRAY CONSISTS OF 3 STRINGS OF ROOF-MOUNTED PV PANELS (33

TOTAL).

2. WIRING FROM PV ARRAY TO JUNCTION BOX IS #12 PV/USE-2 WIRE W/ MC4

CONNECTORS. ALL CONNECTORS LABELED "DO NOT OPEN UNDER LOAD".

3. PV WIRE ENTERS WATERPROOF JUNCTION BOX THRU WATERPROOF

STRAIN RELIEF. JOIN TO #10 THWN-2 CONDUCTORS USING PANDUIT BSN-10

NYLON INSULATED BUTT SPLICE APPROVED FOR CONNECTING #12 AWG

STRANDED TO #10 AWG STRANDED THWN-2. USE UL LISTED CRIMP TOOL.

4. SMA UL APPROVED DC DISCONNECT.

5. INVERTER OUTPUT SUPPLIED TO SERVICE PANEL USING 40 A BACKFED

BREAKER. INSTALL OPPOSITE SERVICE ENTRANCE AND LABEL PER NEC

690.64 (b) (7).

6. CONTINUOUS #8 AWG GROUND CONDUCTOR FROM INVERTER TO GROUND

AT SERVICE PANEL.

ONE-LINE DIAGRAM

NOT TO SCALE

GENERAL NOTES:

PV POWER SYSTEM IS SIZED TO SUSTAIN THE

RESIDENCE.

Version Dated May 5, 2017

Trico Electric Cooperative, Inc.

Interconnection Requirements

For

Distributed Generation

TRICO ELECTRIC COOPERATIVE, INC. INTERCONNECTION REQUIREMENTS FOR DISTRIBUTED GENERATION

TABLE OF CONTENTS

1. SCOPE

2. DEFINITIONS

3. OVERVIEW OF DISTRIBUTED GENERATION ISSUES

4. DISTRIBUTED GENERATION TYPES

5. GENERAL INFORMATION & REQUIREMENTS

6. DESIGN CONSIDERATIONS AND DEFINITION OF CLASSES

7. INTERCONNECTION TECHNICAL REQUIREMENTS

8. APPLICATION PROCESS AND DOCUMENTATION REQUIREMENTS

9. TESTING AND STARTUP REQUIREMENTS

10. OPERATIONAL AND MAINTENANCE REQUIREMENTS

EXHIBIT 1: POWER QUALITY CHARACTERISTICS

EXHIBIT 2: TRICO RELAY SETTINGS AND RE-CLOSING PRACTICES

EXHIBIT 3: TRICO EXTENDED PARALLEL ONE LINE EXAMPLE…………….23

EXHIBIT 4: TRICO STATIC INVERTER ONE LINE EXAMPLE………………….24

EXHIBIT 5: DG APPLICATION PROCESS

EXHIBIT 6: TRICO HOLD TAG

APPENDIX: APPLICATION AND EQUIPMENT INFORMATION FORM

1. SCOPE

This document specifies Trico Electric Cooperative, Inc. (Trico) requirements for safe and effective interconnection of a Distributed Generator with Trico's electric distribution system. Interconnection requirements as outlined here are for those installations that will be connected to Trico's electric distribution system at 69kV or less. These requirements apply to installations not subject to the Arizona Electric Power Cooperative (AEPCO) Open Access Transmission Tariff (OATT).

This Document does not provide for nor include transmission service. The availability of transmission service may not be inferred or implied from this document. Transmission service on the transmission system is available pursuant to the AEPCO OATT.

For the purpose of simplicity, the term "Customer" will be used here to refer to a Trico Customer or Member who installs, owns or operates a distributed generator, cogenerator or small power producer.

The required protective relaying and/or safety devices and requirements specified in this document are for protecting utility facilities and other utility customers' equipment from damage or disruptions caused by a fault, malfunction or improper operation of the distributed generating facility. They are also necessary to ensure the safety of utility workers and the public. The requirements specified herein do not include additional relaying, protective or safety devices as may be required by industry and/or government codes and standards, equipment manufacturer requirements and prudent engineering design and practice to fully protect Customer’s generating facility or facilities; those are the sole responsibility of the Customer. In addition to all applicable regulatory, technical, safety, and electrical requirements and codes, Customers will also be subject to contractual and other legal requirements, which will govern over the general provisions in this document.

Customers and Trico personnel shall use this document when planning the installation of distributed generation to be connected to or expecting back-up electrical service from Trico. Note that these requirements may not cover all details in specific cases. Trico encourages the Customer to discuss project plans with Trico before designing their facility or purchasing and installing equipment. This document must be applied in conjunction with applicable rate tariffs and electrical service schedules and requirements that pertain to the operation of distributed generation with the Trico electrical distribution system and is subject to regulatory change.

2. DEFINITIONS

2.1 Clearance Point: A clearance point is the physical location on a piece of line or equipment that is to be de-energized from all known sources of power and tagged. Further, that piece of line or equipment shall remain in the condition stated until released by the person having the clearance.

2.2 Cogeneration Facility: Any facility that sequentially produces electricity, steam or forms of useful energy (e.g., heat) from the same fuel source and which are used for industrial, commercial, heating, or cooling purposes.

2.3 Customer: Any Trico customer who installs, owns or operates a GF.

2.4 DG Service Disconnect: Visible gang operated load break disconnect switch(s) or breaker(s), capable of being locked in a visibly “open” position by a standard Trico padlock that will completely isolate the GF from the Trico system. Customer’s disconnect switch(s) or breaker(s) shall be clearly labeled with permanent letters 1” high stating “DG Service Disconnect”.

2.5 Distributed Generator: Any type of electrical generator or static inverter producing alternating current that (a) has the capability of parallel operation with the utility distribution system, or (b) is designed to operate separately from Trico system and can feed a load that can also be fed by Trico’s electrical system. A distributed generator is sometimes referred to simply as “generator”.

2.6 Electric Supply/Purchase Agreement: An agreement between Trico and the Customer covering the terms and conditions under which electrical power is supplied and/or purchased to/from Trico.

2.7 Generating Facility (GF): All or part of the Customer’s distributed electrical generator(s) or inverter(s) together with all protective, safety, and associated equipment necessary to produce electric power at the Customer’s facility. A GF also includes any Qualifying Facility (QF).

2.8 Hot Line Order: The method used as an aid in protection of personnel working on or near energized equipment, whereby automatic or remote re-closing of a line is disabled. When a hold tag (see Exhibit 6) is in effect, if the circuit trips open, it will not be re-closed until the system operator receives a release from the person to whom the hold was issued. As it relates to distributed generation, circuits with hold tags shall have all potential sources of backfeed removed by opening, locking and tagging the appropriate disconnect switch.

2.9 Interconnection Agreement: An agreement, together with appendices, signed between Trico and the Customer (Generating Facility) covering the terms and conditions governing the interconnection and operation of the Generating Facility with Trico.

2.10 Islanding: A condition occurring when a generator and a portion of the utility system separate from the remainder of the utility system and continue to operate in an energized state (copyright

EPRI).

2.11 Metering Service: All functions related to measuring electricity consumption.

2.12 Network System: An electrical system that can be fed simultaneously from multiple sources.

2.13 Parallel Operation: The operation of a GF that is electrically interconnected to a bus common with the utility electrical system, either on a momentary or continuous basis.

2.14 Points of Interconnection: The physical location where the utility’s service conductors are connected to the Customer’s service conductors, at which point the power transfer occurs between the Customer’s electrical system and the utility distribution system, also commonly referred to as the Point of Common Coupling.

2.15 Qualifying Facility (QF): Any Cogeneration or Small Power Production Facility that meets the criteria for size, fuel use, efficiency, and ownership as promulgated in 18 CFR, Chapter I, Part 292, of the Federal Energy Regulatory Commission’s Regulations.

2.16 Relay: An electric device that is designed to interpret input conditions in a prescribed manner and after specified conditions are met to respond to cause contact operation or similar abrupt change in associated electric control circuits.

2.17 Small Power Production Facility: A facility that uses primarily biomass, waste or renewable resources, including wind, solar, and water to produce electric power.

2.18 Static Inverter: A dc to ac device that converts energy to ac energy for utility interconnection. The inverter contains many control functions, such as voltage and frequency monitoring and protection against islanding. Inverter(s) must be listed and in compliance with Underwriters Laboratories (UL) Subject 1741, Standard for Static Inverters and Charge Controllers for Use in Photovoltaic Systems. Utility-interactive inverters that pass the tests of the new UL 1741 standard will be, by definition, “non-islanding” inverters and will comply with all elements of the new IEEE 929-2000 interconnection standard. The 2005 National Electrical Code requires that all utility-interactive photovoltaic systems use listed inverters that pass UL 1741

2.19 Transfer Trip Scheme: A form of remote trip in which a communication channel is used to transmit a trip signal from the relay location to a remote location.

2.20 Utility: The electric utility entity (Trico) that constructs, operates and maintains the electrical distribution system for the receipt and/or delivery of power, also referred to as the Utility Distribution Company (UDC).

2.21 Utility Grade Relays: Relays specifically designed to protect and control electric power apparatus, tested in accordance with the following ANSI/IEEE standards:

(a) ANSI/IEEE C37.90-1989 (R1994), IEEE Standard for Relays and Relay Systems Associated with Electric Power Apparatus.

(b) ANSI/IEEE C37.9.01-1989 (R1994), IEEE Standard Surge Withstand (SWC) Tests for Protective Relays and Relay Systems.

(c) ANSI/IEEE C37.90.2-1995, IEEE Standard Withstand Capability of Relay Systems to Radiated Electromagnetic Interference from Transceivers.

3. OVERVIEW OF DISTRIBUTED GENERATION ISSUES

Any Customer may operate its generating equipment in parallel with Trico provided:

a) For Interconnection of a proposed generator to Trico’s radial distribution circuit, the aggregated generation, including the proposed generator, on the circuit will not exceed 15 percent of the total circuit annual peak load as most recently measured at the substation or on a line section.

In the case of generators certified to UL 1741 and IEEE 1547, a line section is that portion of a distribution system connected to a customer’s facility bounded by automatic sectionalizing devices, or the end of the distribution line. For non-certified generators, a line section is that portion of a distribution system connected to a customer’s facility bounded by automatic sectionalizing devices, a fused lateral, or the end of the distribution line. The aggregated generation, including the proposed generator, must also be less than 50 percent of the minimum daytime feeder or line section load, where these data are available, unless the minimum load is zero.

b) The proposed generator, and new motors associated with the proposed generator, in aggregation with other generation on the distribution circuit, will not contribute more than 10 percent to the Trico’s distribution circuit’s maximum fault current at any point on Trico’s distribution system, including normal contingency conditions that may occur due to reconfiguration of the feeder or the distribution substation.

c) The proposed generator, in aggregate with other generation on the Trico’s distribution circuit, will not cause any distribution protective devices and equipment (including but not limited to substation breakers, fuse cutouts, and line reclosers), or customer equipment on the system, to exceed 90 percent of the short circuit interrupting capability; nor is the Interconnection proposed for a circuit that already exceeds 90 percent of the short circuit interrupting capability.

d) The proposed generator’s Point of Interconnection will not be on a transmission line.

e) The proposed generator cannot exceed the capacity of the customer’s existing electrical service.

And the Customer installs equipment that will:

(a) not present any hazards to the utility personnel, other customers or the public,

(b) minimize the possibility of damage to the utility or other customer equipment,

(c) not adversely affect the quality of service to other customers, and

(d) not hamper efforts to restore a feeder to service (specifically when a clearance or hold tag is required).

In addition, the Customer must:

(a) install its generating facility to meet all the interconnection, safety, and protection requirements outlined in this document,

(b) enter into an Interconnection Agreement with Trico and, if applicable, a Electric

Supply/Purchase Agreement with Trico.

(c) comply with all applicable service schedules and requirements, pricing plans, tariffs, Rules and

Regulations, and any other applicable requirements approved by the Arizona Corporation Commission.

(d) for new installations all service entrance equipment must be submitted in writing to Trico for Trico review and approval.

The protective and safety devices (relays, circuit breakers, disconnect switches, communication channels etc.) specified in this document must be installed and placed into service before allowing parallel operation of Customer’s generation facilities with Trico’s system. The purpose of these devices is to isolate the Customer’s generating equipment from the utility system whenever faults or disturbances occur and for maintenance purposes. Modifications to Trico’s electrical system configuration or protective equipment may also be required, at the expense of the Customer, in order to accommodate parallel generation. Additional agreements may be required between the Customer and Trico before modifications to the distribution system are made.

Trico will not assume any responsibility for the protection of the Customer’s generator(s), or of any other portion of the Customer’s electrical equipment. The Customer is fully and solely responsible for protecting his equipment in a manner to prevent any faults or other disturbances on Trico’s distribution system from damaging the Customer’s equipment.

The Customer must obtain all required permits.

4. DISTRIBUTED GENERATION TYPES

Distributed generation is any type of electrical generator or static inverter producing alternating current that (a) has the capability of parallel operation with the utility distribution system, or (b) is designed to operate separately from the utility system and can feed a load that can also be fed by the utility electrical system. A distributed generator is sometimes referred to simply as “generator”.

Distributed generators include induction and synchronous electrical generators as well as any type of electrical inverter capable of producing A/C power. A Separate System, or Emergency or Standby Generation System, is designed so as to never electrically interconnect or operate in electrical parallel with the utility system. A Parallel System, or Interconnected Generation System, is any generator or generation system that can parallel, or has the potential to be paralleled via design or normal operator control, either momentarily or on a continuous basis, with the utility system.

The Customer may elect to run his generator as a separate system with non-parallel load transfer between the two independent power systems, or he may run it in parallel with the utility system. A description and the basic requirements for these two methods of operation are outlined below.

4.1 Separate System

A separate system is one in which there is no possibility of electrically connecting or operating the Customer’s generation in parallel with the utility's system. The Customer’s equipment must transfer load between the two power systems in an open transition or non-parallel mode.

Emergency or Standby generators, used to supply part or all of the Customer’s load during a utility power outage, are required by the National Electrical Code (NEC) to have transfer equipment designed and installed to prevent the inadvertent interconnection of normal and emergency sources of supply in any operation of the transfer equipment.

These generators must be connected to the Customer’s wiring through a double throw, “break-before-make” transfer switch specifically designed and installed for that purpose. The transfer switch must be of a fail-safe mechanical throw-over design, which will under no circumstances allow the generator to electrically interconnect or parallel with the utility system. The transfer switch must always disconnect the Customer’s load from the utility power system prior to connecting it to the generator. Conversely, the transfer switch must also disconnect the load from the generator prior to re-connecting it back to the utility system. These requirements apply to both actual emergency operations as well as generator testing. All transfer switches and transfer schemes must be inspected and approved by the jurisdictional electrical inspection agency.

Portable generators are not designed for connection to a building’s permanent wiring system, and are not to be connected to any such wiring unless a permanent and approved transfer switch is used. Failure to use a transfer switch can result in backfeed into the utility system – the generator voltage can backfeed through the utility transformer and be stepped up to a very high voltage, which poses a potentially fatal shock hazard to anyone working on the power lines or on utility equipment.

4.2 Parallel System

A parallel, or interconnected, generator is connected to a bus common with Trico’s system, which may result in a transfer of power between the two systems. In interconnected operations a Customer’s generator becomes an integral part of the utility system that must be considered in the electrical protection and operation of the utility system.

Parallel generators encompass any type of distributed generator or generating facility that can electrically parallel with, or potentially backfeed Trico’s system. Additionally, any generator system using a “closed transition” type transfer switch or a multi-breaker transfer scheme, or an electrical inverter that can be configured or programmed to operate in a “utility interactive mode” constitutes a potential backfeed source to the utility system, and is classified as an interconnected generator.

For a Customer to interconnect its generator to Trico’s system, specific interconnection and contractual requirements must be met, and information must be submitted for all interconnected generators as is specified in the various sections of this document. Requirements include a DG Service Disconnect, as well as protective relaying, metering, communication links, and other safety and information requirements. Trico personnel will inspect the system, and Trico reserves the right to witness testing of these protective schemes. The Customer must enter into an Interconnection Agreement and, as applicable, an Electric Supply/Purchase Agreement with the utility. Trico approval is not extended to any specific type of generator or generator scheme since each project is site specific and needs to be reviewed on a case-by-case basis.

In addition to the various other requirements specified in this document, Parallel Systems shall specifically comply with the technical requirements outlined in the Interconnection Technical Requirements section (Section 7) of this document.

5. GENERAL INFORMATION & REQUIREMENTS

The Customer is financially responsible for all facilities required to be installed solely to interconnect the Customer’s generation facility to the utility system. This includes connection, conductors, conduits, transformation, switching, protective relaying, metering, grounding and safety equipment, including a visible open DG Service Disconnect switch and any other requirements as outlined in this document or other special items specified by Trico. All such Customer facilities are to be installed by the Customer at the Customer’s sole expense. In the event that additional Trico facilities are required to be installed to accommodate the Customer’s generation, Trico will install such facilities at the Customer’s expense.

Trico shall also charge the Customer for any administrative costs and/or the costs of studies required to interconnect the Customer’s generation facilities. Studies may include but are not limited to:

(a) review of grounding adequacy

(b) fault current calculation and protective relay settings

(c) interaction of customer’s generating facility with Trico's system

The Customer will own and be responsible for designing, installing, operating and maintaining:

(a) The generating facility in accordance with the requirements of all-applicable electric codes, laws and governmental agencies having jurisdiction. This includes, but is not limited to:

UL 1741 – Inverters UL 1703 - PV Panels UL 2200 – Microturbines IEC 61400 – Wind Turbines UL 1008 – Transfer Switches IEEE 519 – Harmonics IEEE 1547 – Distributed Resources/Utility Interconnection (presently not available) IEEE 929-2000 - Recommended Practice for Utility Interface of Photovoltaic Systems NEC Article 250 – Grounding NEC Article 445 – Generators NEC Article 690 - Solar Photovoltaic Systems NEC Article 700 – Emergency Systems NEC Article 702 – Optional Standby Systems

(b) Any control and protective devices, in addition to protective relays and devices specified in this document, to protect its facilities from abnormal operating conditions, including but not limited to, electric overloading, abnormal voltages, and fault currents.

(c) Interconnection facilities on the Customer’s premises as may be required to deliver power from the Customer’s generating facility to the utility system at the Point of Interconnection.

5.1 Insurance

Customers interconnecting a generator with Trico shall be required to maintain public liability and property damage insurance. Insurance requirements are outlined in the Interconnection Agreement between Trico and the Customer.

5.2 Interconnect Agreement

All interconnected Customers are required to sign, in addition to any other special agreements as may be applicable, an Interconnect Agreement with Trico.

5.3 Electric Supply/Purchase Agreement

Customers purchasing energy from ‘Trico, utilizing an interconnected DG system, may be required to sign a trilateral agreement for backup, supplemental and maintenance power from Trico and/or AEPCO

Customers operating a parallel generator may also be required to sign an agreement or take service under a tariff with Trico and if applicable with AEPCO that provides for movement of power over Trico’s distribution and AEPCO’s transmission systems.

The Customer may sell power to AEPCO, or if applicable, other utilities, electric wholesalers.

These entities may or may not be obligated to purchase this power and any such sales would be made under the terms and conditions offered by the purchaser. For a Customer who wishes to sell power to others, the customer will be required to:

(a) Choose the applicable Trico and if applicable, AEPCO tariff that allows for the movement of power over Trico’s distribution and if applicable, AEPCO transmission systems;

(b) Sign an agreement with the purchaser of the electric power, and/or

(c) Follow all applicable criteria/protocols established by NERC, WSCC, the approved RTO, and AZISA regarding the sale of power to others.

All tariffs under the purchase and supply arrangements are subject to change by Trico and / or AEPCO as applicable, and approval of the ACC and other regulatory agencies including the Rural Utilities Service (RUS).

5.4 Interconnections

Trico will not install or maintain any lines or equipment on a Customer’s side of the Point of Interconnection, except that Trico may install its meter and/or research equipment. Only Trico authorized employees may make and energize the service connection between the utility system and the Customer’s service entrance conductors.

Normally, the interconnection will be arranged to accept only one type of standard service at one Point of Interconnection. If a Customer’s generating facility requires a special type of service, or if sales to Trico will be at a different voltage level, the services will only be provided according to additional specific terms that are outlined in the Electric Supply/Purchase Agreement, applicable service schedules, or other terms and conditions governing the service.

5.5 Easements and Rights of Way

Where an easement or right of way is required to accommodate the interconnection, the Customer shall be required to provide, or obtain from others and provide, suitable easements or rights of way, in Trico’s name.

5.6 Meter Installations

Trico has metering requirements for a GF. The Customer shall contact Trico for design requirements and installation details. Trico may elect to install, own, and/or operate the metering of the GF at the Customer’s sole cost.

6. DESIGN CONSIDERATIONS AND DEFINITION OF CLASSES

Protection requirements are influenced by the size and characteristics of the parallel generator along with the nature and operational characteristics of the associated utility system. Therefore, similar units connected to different lines could have different protection requirements based on varying load conditions, as well as on the specific utility feeder and transformer characteristics.

6.1 Synchronous Units

Synchronous generators are generally capable of supplying sustained current for faults on Trico’s system. These units can also supply isolated utility load providing the load is within the units' output capability, and must be prevented from energizing a de-energized utility line.

Trico will specify the maximum allowable protective relay time settings for a particular proposed distributed generator installation. The Customer is responsible for ensuring generator separation prior to utility circuit re-energization to prevent out-of-sync paralleling.

6.2 Induction Units

Induction generators are basically induction motors that are mechanically driven above synchronous speed to produce electric power. These units do not have a separate excitation system and, as such, require that their output terminals be energized with AC voltage and supplied with reactive power to develop the magnetic flux. Induction generators are therefore normally not capable of supplying sustained fault current into faults on the utility system. Such units are generally not capable of supplying isolated load when separated from the utility system; however, it is possible for an induction generator to become self-excited if a sufficient amount of capacitance exists at its output terminals. Under conditions of self-excitation, an induction generator will be capable of supplying isolated load, providing the load is within the units' output capability. In most cases when self-excitation occurs it will be accompanied by a sudden increase in terminal voltage. Trico and its other customers must be protected from out-of-sync closing and over-voltages that can occur whenever an induction generator becomes self-excited. Induction units shall therefore be designed to automatically separate from Trico’s system upon loss of utility voltage and prior to reclosing of Trico’s feeder.

6.3 Static Inverters

Static inverters convert DC power to AC by means of electronic switching. Switching can be controlled by the AC voltage of the utility's supply system (line-commutated) or by internal electronic circuitry (forced-commutated). Line-commutated inverters are generally not capable of operating independently of the utility's AC supply system and, as such, cannot supply fault current or isolated loads under normal conditions. Forced-commutated, or self-commutated, inverters are capable of supplying fault current and load independently of the AC supply system. Any forced-commutated inverter that is to be interconnected with the utility must be specifically designed for that purpose, i.e. it must be designed to accommodate parallel interfacing and operation. Static inverters must be designed to automatically separate from the utility system upon loss of utility voltage and prior to reclosing of the utility feeder.

6.4 Definition of Generator Size Classes

The following generator size classifications are used in determining specific minimum protective requirements for distributed generation facilities. Specified ratings are for each connection to Trico’s system. Customers must satisfy, in addition to the general requirements specified in this document, the minimum relaying requirements given in this document for each generator class.

(a) Class I 50 kW or less, single or three phase

(b) Class II 51 kW to 300 kW, three phase

(c) Class III 301 kW to 5,000 kW, three phase

(d) Class IV over 5,000 kW, three phase

7. INTERCONNECTION TECHNICAL REQUIREMENTS

The requirements and specifications outlined in this section are applicable to distributed generation interconnected for parallel operation with Trico’s distribution system, unless otherwise specified. The protection and safety devices and other requirements specified in the following sections are intended to provide protection for the utility system, utility workers, other utility customers and the general public.

They are not imposed to provide protection for the Customer’s generation equipment or personnel; this is the sole responsibility of the Customer.

With respect to the above protection objectives, it is necessary to disconnect the parallel generator when trouble occurs. This is to:

(a) ensure if a fault on the utility system persists, the fault current supplied by the Customer’s generator is interrupted;

(b) prevent the possibility of reclosing into an out-of-synch isolated system composed of the utility distribution system, or a section thereof, and the Customer’s generator; and

(c) prevent reclosing into the Customer’s generation system that may be out of synchronization or stalled.

The protection requirements are minimal for smaller installations, but increase as the size of the Customer’s generation increases. Small installations usually ensure that, for any fault on Trico’s system, Trico protective devices will operate and normally isolate the generation with a large amount of load, causing under-voltage automatic shutdown of the generator. For larger installations the probability of isolated operation is higher since the available generation may be sufficient to carry the entire load, or part thereof, of the local utility circuit. In instances where the utility system arrangement is such that it is possible that the generators will not always be isolated with comparatively large amounts of load, additional protection (including a transfer trip scheme) and generator shutdown schemes are required.

Trico and AEPCO apply automatic reclosing to overhead distribution and transmission circuits. When the utility source breaker trips, the Customer must ensure that their generator is disconnected from the utility circuit prior to automatic reclosure. Trico applies instantaneous reclosing at substations and at other protective device locations along its distribution lines, in which the distribution circuit can be re-energized in less than 20cycles (333 msec) after a protective relay trip. In order to assure reliable service to other Trico customers, the Customer’s generator shall be disconnected from Trico’s system within 5 cycles (83.3 msec) of a utility initiated protective relay trip. Inability of the Customers equipment to meet these time constraints may require the Customer to install a transfer trip scheme. In addition, automatic reclosing out-of-synch with the Customer’s generator may cause severe damage to Customer equipment and could also pose a serious hazard to Customer or utility personnel. In a few cases, there are in-line reclosers away from the substation. In these situations, transfer trip is not possible. Additional review by Trico is required in these cases.

7.1 General Technical Requirements

(a) Customer is responsible for obtaining and maintaining all required permits.

(b) Multiple generator connections on the same utility service are permitted; however, a DG

Service Disconnect for the facility will be required (normally located at the service entrance section).

(c) In the event that a generator, or aggregate of generators, are of sufficient size to carry the entire (minimum) load of the Trico distribution feeder, or if a generator size and physical location on a feeder is such that it could support an isolated (islanded) section of the feeder, then a transfer trip scheme shall be required at the Customer’s expense. If a transfer trip is required, a communication channel and telemetering shall also be required, at the Customer’s expense, to facilitate proper parallel operation... The transfer trip channel may be leased telephone, power line carrier, pilot wire, microwave or other Trico approved medium. The transfer trip equipment will be configured to trip the Customer’s generator for loss of the channel signal.

(d) For synchronous generators, the Customer shall ensure that any potential open points such as breakers, fused disconnect switches, etc, located between the generator breaker and utility service are appropriately equipped with either (1) keyed or other suitable mechanical interlocks to prevent them from being inadvertently opened when the generator breaker is closed, or (2) contacts that will instantaneously trip the generator breaker if any such switch were opened while the generator breaker was closed. The intent of the above is to prevent the opening and subsequent (inadvertent) re-closing of such a breaker or switch onto an un-synchronized generator.

(e) Customer shall ensure that the design and installation of electric meter(s) is such that the meter(s) are located on Trico’s-side of the generator breaker on a normally energized bus.

(f) The Customer is responsible for the design, installation, operation and maintenance of all equipment on the Customer’s side of the Point of Interconnection. It is required that the Customer submit specifications and detailed plans as specified in the Application and Equipment Information Form (see Appendix) for the installation to Trico for review.

Review by the Trico does not indicate acceptance or approval by the utility or other authorities.

(g) All photovoltaic generators 5kW or less are exempted from this document.

7.2 DG Service Disconnect

The Customer shall install and maintain a DG Service Disconnect in order to isolate all ungrounded conductors of the Customer’s generating facility from Trico’s system.

The DG Service Disconnect will normally be required to be installed at the Customer’s electrical service entrance section; however it may be located in the immediate vicinity of the generator, subject to utility approval.

The DG Service Disconnect must be rated for the voltage and current requirements of the generation facility, and must meet all applicable UL, ANSI and IEEE standards. The DG Service

Disconnect shall meet the requirements of the National Electric Code (NEC), and shall be properly grounded.

In cases where the DG Service Disconnect is a load break switch, the switch blades, jaws and the air-gap between them shall all be clearly visible when the switch is in the “open” position. It is not acceptable to have any of the “visible open” components obscured by the switch case or an arc-shield, etc. Only switches specifically designed to provide a true “visible open” are acceptable.

Such switch shall be installed in a place so as to provide easy and unrestricted accessibility to Trico personnel on a 24-hour basis. Trico shall have the right to lock open the switch without notice to the Customer when interconnected operation of the Customer’s generating facility with the Trico’s system could adversely affect the utility system or endanger life or property, or upon termination of the Interconnect Agreement. For multi-phase systems, the switch shall be gang-operated.

In cases where the DG Service Disconnect will be installed on a line at a voltage above 500V, Trico may require the customer to install a rack-out breaker, along with a racking tool and grounding device, in lieu of a load break switch. In these cases, the utility will work with the Customer to determine the best option and ensure that the safety requirements are met.

7.3 Dedicated Transformer

Customer generators with a combined total rating of over 10 kW, as measured at the service entrance, may be required to be isolated from other customers fed off the same utility transformer by a dedicated power transformer connecting to the utility distribution feeder. The primary purpose of the dedicated transformer is to ensure that (a) the generator cannot become isolated at the secondary voltage level with a small amount of other-customer load, and (b) the generator does not contribute any significant fault current to other customers’ electrical systems. Dedicated transformers also help to confine any voltage fluctuation or harmonics produced by the generator to the Customer’s own system. The utility will specify the transformer winding connections and impedance.

7.4 Power Quality

Customer shall ensure that the electrical characteristics of its load and generating equipment will maintain the Trico’s normal power quality requirements. Any deviation from sine wave form or unusual short interval fluctuations in power demand or production shall not be such as to result in impairment of service to other customers or in interference with operation of computer, telephone, television or other communication systems or facilities. Those power quality items will generally include the following:

Current Imbalance Harmonics Voltage Flicker Power Factor

Exhibit 1 lists, for general informational purposes, Trico’s Power Quality requirements which may be updated from time to time. The Customer should verify actual requirements before designing/installing GF.

7.5 Voltage Requirements

Customer generating equipment must deliver at the Point of Interconnection, 60 Hertz, either single or three-phase power at one standard Trico voltage as may be agreed upon by the Customer and Trico subject to availability at the premises.

7.6 Telemetry

For generators Class III or greater, Customer shall provide to Trico, at Customer’s cost, MW and MVAR transducer output quantities for the purpose of control area system load calculations.

7.7 WSCC/NERC Requirements

If applicable, customer shall comply with WSCC/NERC generator testing criteria, including but not limited to, the applicable criteria regarding the installation and operation of Power System Stabilizers (PSS) and Automatic Voltage Regulators (AVR).

7.8 Labeling Requirements

(a) General Requirements

The Customer shall conform to the NEC for labeling of generation equipment, switches, breakers, etc. Trico will assume the responsibility for labeling any Trico owned equipment.

(b) DG Service Disconnect The Customer shall label the DG Service Disconnect by means of a permanently attached placard with clearly visible and permanent letters minimum 1” high. Such Label shall say “DG SERVICE DISCONNECT”. In addition, Trico may need to attach its own label to the DG Service Disconnect.

(c) Service Entrance

A sign shall be placed at the service entrance indicating type and location of onsite emergency power sources, legally required standby power sources, and onsite optional standby power sources, as defined by the NEC.

The NEC also requires a permanent directory, denoting all electrical power sources on or in the premises, shall be installed at each service equipment location and at locations of all electric power production sources capable of being interconnected. Installations with large numbers of power production sources shall be permitted to be designated by groups.

7.9 Protective Requirements

(a) General Requirements

1. The Customer shall be solely responsible for properly protecting and synchronizing his generator(s) with Trico’s system. The Customer is solely responsible for the protection of their equipment from automatic reclosing by the utility.

2. Devices with definite level and timing characteristics (e.g., micro-processor type relays) will be necessary to meet the requirements established herein.

3. Generator classes II and above (>50 kW), must utilize discreet relays, separate and independent voltage and frequency relays and associated trip paths to the generator breaker (automatic interrupting device). This is to ensure a redundant trip function in the event of a single relay failure or out-of-tolerance condition.

The instantaneous/time overcurrent functions can be integrated into a single ground overcurrent relay.

The over/under voltage functions can be integrated into a single over/under voltage relay.

The over/under frequency functions can be integrated into a single over/under frequency relay.

Protective relays or microprocessor based devices may be used provided that the required functionality described herein is demonstrated. For generating equipment that is capable of sustained operation above its normal current rating, phase overcurrent tripping shall be required to trip the unit should it exceed this rating.

4. For generator protection schemes that utilize microprocessor based, multi-function relays, one of the following requirements must be met:

(a) Protective relay failure will not only alarm but will also trip the generator breaker/contactor.

(b) If relay failure alarms, but does not trip the generator breaker, then additional relaying which meets the requirements stated herein for each class must be provided.

5. With the addition of generation at a Customer site, the ground fault current magnitude might increase to the level where the grounding grid is insufficient to protect personnel from step or touch potentials. Therefore, the Customer is required to ensure the adequacy of the Customer’s grounding grid to keep the step and touch potentials at a safe level in the vicinity of equipment accessible by utility personnel or the general public.

6. The Customer shall ensure that the GF protective relaying and controls are adequately protected from electrical surges that may result from lightning, utility switching or electrical faults.

7. Addition of the Customer’s GF may require additional control, metering and protective devices on Trico’s facilities. The Customer will be responsible for all labor and material costs associated with their installation.

8. Exhibit 2 lists for general informational purposes Trico’s relay settings which may be updated from time to time. The Customer should verify with Trico prior to designing/installing a GF

(b) Generator Class Protective Requirements

Trico shall require the following as minimum acceptable protection:

1. Class I (Single or Three Phase: 50 kW or less)

a) The minimum protection required is an under-voltage contactor.

b) For all synchronous generators and forced commutated inverters, either a manual or automatic synchronizing scheme is required.

2. Class II (Three Phase: 51-300 kW)

a) Protection for overvoltage, undervoltage, overfrequency, and underfrequency is required.

b) For all synchronous generators and forced commutated inverters, either a manual or automatic synchronizing scheme is required

c) Phase time and instantaneous overcurrent relays are required.

d) A ground time and instantaneous over current relay is required. For installations interconnected to the utility through a transformer with connections that will…