One significant change involves ganged devices, particularly when isolating inverter systems. Previously, each inverter required separate isolation, which could be cumbersome. Now, if you have more than two Inverter Energy Systems (IESs) connected to a switchboard and those IESs are on a ganged switch, they are treated as one device. This means you only need one main switch for the entire inverter system, streamlining management.
Simplified Isolation Rules
The new rules also address isolation requirements for large systems with multiple inverters. If the first inverter is within 3 meters of the main switchboard, and all other inverters are visible from this point, you don’t need an isolator at each inverter. Instead, placing an isolator within 3 meters of the first inverter is sufficient.Updates on Interface Protection Interface protection, which was once required for systems over 30 kVA, is now optional for systems under 200 kVA. This decision is at the discretion of the Distribution Network Service Provider (DNSP). The updated standards also align with AS/NZS 4777.2, clarifying set points for interface protection.
For certain installations, like embedded networks in retirement villages, interface protection may not be necessary even if the total capacity exceeds 200 kVA. The DNSP will make this determination based on specific circumstances.
EV Supply Equipment (EVSE) Insights The standards now include guidance on electric vehicle (EV) charging. There are two main types of EV Supply Equipment (EVSE): DC EVSE and AC EVSE. Both types can provide either supplementary or alternative supplies, depending on the needs of the system.
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