Amendments to the Service and Installation Rules of NSW

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1 Customer Installations Advice No /8/ 2011 Doc. Ref. Service and Installation Rules of NSW TO: Customers, Service Providers, Electrical Contractors and Ausgrid Staff Amendments to the Service and Installation Rules of NSW Scope The Department of Trade, Investment, Regional Infrastructure and Services (DTIRIS) has released its July 2011 amendment to the Service and Installation Rules of NSW. These amendments are attached below and can be obtained, along with a full updated version of the publication via the link below. The changes outlined in this amendment will take effect from 1 October Link to DTIRIS Website:

2 Service & Installation Rules of NSW July 2011 Amendments Summary Section 1 General Requirements CHANGES ARE UNDERLINED NOTE: MINOR CHANGES OF A SECRETARIAL NATURE ARE NOT LISTED. 1.5 PROVISION FOR SERVICES, SERVICE AND METERING EQUIPMENT Number of Phases The number of phases required to supply an installation must be determined by: (a) The maximum load permitted by the electricity distributor in accordance with Table 1.1; and (b) The load characteristics of customer s equipment, eg three phase motors, instantaneous water heaters, 400V welders, large heat/air conditioning loads. (c) Generating installations under certain circumstances must be connected over multiple phases. 1.9 CONNECTION AND DISCONNECTION OF ELECTRICAL INSTALLATIONS Availability of Supply Capacity Customers should give notice as specified by the electricity distributor of their supply requirements so that the appropriate arrangements can be made. This particularly applies where a customer intends to install items of equipment which: (a) Place significant electrical loads on the electricity distribution system. (b) May affect the quality of electricity supply to other customers. (c) Export to the network and may have adverse effects on the network or the customer s installation PROVISION FOR CONSUMERS INSTALLATION General The equipment in an electrical installation must be arranged and operated so as to minimise or prevent adverse effects etc. (a) Excessive fluctuations - equipment which would cause excessive voltage disturbances on the distribution system as a result of large or fluctuating load (d) Section 3 Overhead Services 3.5 SPANS, TENSIONS AND CLEARANCES Clearances to other Utility Services The accredited service provider is responsible for obtaining the required minimum clearance of 600mm between the proposed overhead demands, eg arc furnaces, welding machines, etc. Generating systems which may have adverse effects on the network or the customer s installation.. service and conductive aerial communications cables. Note: Alternative arrangements for nonconductive communications cables may apply.

3 Section 4 Service and Metering Equipment 4.7 SERVICE PROTECTION DEVICE Circuit Breakers in Lieu of Service Protective Devices greater than 100A Circuit breakers may be used as an alternative to service protective devices in accordance with the following requirements. (f) (i) Have any adjustable settings sealable such that only authorised persons have access. A sealed escutcheon does not satisfy this requirement. Have a label describing the circuit breaker load current settings attached adjacent to the circuit breaker SEALING OF SERVICE AND METERING EQUIPMENT Security seals must not be removed by persons without authorisation/permission from the electricity distributor. Section 8 Alternative Sources of Supply 8.4 REQUIREMENTS FOR STAND-BY GENERATOR SYNCHRONISE CLOSE TRANSFER TRIP SCTT Operating Procedure The time period for operating in parallel with the distribution system during the disconnection or reconnection function..etc. The period for disconnection includes: (a) Closing the generator isolating device to the distribution system once generator and mains supply are synchronised Additional Protection Apart from the protection requirements in AS/NZS 3010, the only additional protection required is a check synchronisation relay. Switchboards must be labelled to AS / NZS 3010 Electrical installations Generating sets. (b) Isolation from the distribution system and transfer of the load to the generator. The period for reconnection includes: (a) Transferring the load from the generator to the distribution system once generator and mains supply are synchronised. (b) Disconnecting the generator. An indicator on the main switchboard must clearly show the generator and electricity distributor s supply system status. 8.6 SMALL SCALE PARALLEL CUSTOMER GENERATION (VIA INVERTERS) 8.6 Introduction These Rules apply to single and three phase generators rated at 10 kw per phase maximum, larger generators will require special negotiation and approval by the electricity distributor, refer to clauses and These installations allow customers to either: (a) have all the electricity generated supplied to the distribution network and for Standard (b) Bi-directional electronic metering capable of separately registering (b) metering to measure the amount of electricity so supplied (gross metering), Figure 8.3; or have some or all of the electricity generated used by the customer rather than being supplied to the distribution network (net metering) Figure 8.4. accumulated imported energy and exported energy.

4 8.6.7 Deleted DC Isolation An appropriately rated double pole DC isolation device must be provided either close to or internal to the inverter, to isolate the DC source from the inverter and operate simultaneously in both positive and negative legs of the supply. Close attention must be paid to any polarity requirements of the isolation device Connection Point It is preferable for the generation system to directly connect to the main switchboard to simplify future metering arrangements. If this is not practicable, the nearest distribution board may be used to connect the generation system and all up stream switchboards labelled. Refer to Section 8.7. The generation system must be connected to a dedicated circuit. The current rating of the inverter circuit cables and cables between distribution boards, the main switchboard and Approvals Documentation (C) Approval by the Clean Energy Council or equivalent Functional In Service Test of Inverter Protection Test Method Isolate the generator supply main switch. The inverter should trip by its own internal protection in less than 2 seconds following disconnection from the distribution system supply. Then close the generator supply main Shut Down Procedure Labelling describing the correct shut down procedure in accordance with the relevant Australian Standard shall be provided. the connection point which carry generation system output must be rated for the full output of the generation system, refer AS/NZS The combined impedance of the consumers mains and service mains must be low enough to ensure the generation system can export to the connection point without excessive voltage rise within the customers installation. switch. The inverter should re-connect after a time delay as per clause Follow a similar procedure to test the backup protection (where installed). Figure 8.3: Example Single Line Diagram Gross Metering (parallel generation source connected at the main switchboard)

5 Figure 8.4: Example Single Line Diagram Net Metering (parallel generation source connected at the main switchboard) 8.7 LABELLING (a) On the switchboard or distribution board that has a generation system connected to it. (b) On all switchboards including the main switchboard and distribution board(s) upstream of the board that has a generation system connected to it. The labelling shall comply with the following Australian Standards: (a) AS 'Grid connection of energy systems via inverters - Installation (b) AS 'Grid connection of energy systems via inverters - Inverter (c) AS Grid connection of energy systems via inverters - Grid protection (d) AS/NZS (e) AS/NZS5033, Installation of Photovoltaic Arrays. Note: The sample labels contained in the previous edition of the Rules has been deleted. Refer to the above Standards. Prepared by: Paul Brownlee Projects Officer Installation Policy & Compliance Authorised by: Noel Dyer Manager Installation Policy & Compliance

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