Grid connected inverters and photovoltaic installations
The number of PV arrays have increased in the ACT over recent years. The technology is developing very quickly with PV arrays evolving from small 500 Watt units to systems exceeding 10 kW a phase. PV arrays above 10 kW have not been in use in the ACT to date.
Development of suitable inspection procedures are underway to address larger PV installations and for the utility to prepare for the technical impact of commercial size PV installations on the distribution network . When planning for larger PV installations, please consider that building approval may apply as well as compliance with the Wiring Rules. Contact ACTPLA’s Construction Occupations Policy and Regulation Section and ActewAGL at the project planning stage.
When installing PV arrays, please check your d.c. voltage at the PV array. Some systems have been found to exceed the d.c .voltage rating of the double pole circuit breaker isolation switch adjacent to the array, and the insulation of the d.c. cables to the inverter. Cables usually purchased by electricians have a 0.6/1 kV rating and you may need to seek more information about voltage ratings from your cable supplier.
Please ensure that a warning label for emergency services is next to the meter box, if one exists, and the building’s main switchboard. For more information on size and colour see AS/NZS 5033.
The Autumn 2008 edition of ACTPLA’s Electrical Newsletter contains more information regarding PV arrays. More important electrical information can be found under industry information, via the Electricians link.
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