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AS/NZS 3000-2018
Australia's MEN Earthing System
Australia uses the Multiple Earthed Neutral (MEN) system — equivalent to TN-C-S in IEC terminology. In this system, the supply neutral is earthed at the transformer, along the distribution line, and again at the customer's main switchboard (the MEN link). This means the earth and neutral conductors share impedance in the distribution network, but are separate inside the customer's installation.
What This Means for Solar Earthing
Component | Earthing Requirement | Connection Point |
|---|---|---|
Inverter chassis | Connected to main earth bar via dedicated PE conductor | Main switchboard earth bar |
Panel frames | Bonded to mounting rail via manufacturer's bonding provisions | Rail to roof frame to earth stake or to structure earth |
Mounting rail | Bonded to structure earth or to the inverter PE conductor | One bond point per 20 m of rail length |
DC conduit (metallic) | Connected to PE system | At each junction box and at inverter end |
Battery enclosure (metal) | Connected to PE system | Main earth bar |
Transformerless Inverter Earthing — The Critical Rule
In a transformerless inverter (the most common residential type), the DC and AC circuits share a common reference through the inverter's internal capacitances. The inverter's GFD function monitors this shared reference. If an installer adds an external earth bond on the DC negative conductor (thinking this makes the system safer), it actually:
Creates a reference point that prevents the GFD from detecting a ground fault on the DC negative conductor
May cause nuisance tripping or GFD bypass conditions
Creates an earth loop that allows fault current to flow through panel frames
Rule: Never add an external earth bond on the DC positive or negative conductor of a transformerless inverter. The inverter manufacturer's earthing diagram must be followed exactly.
Engr. Jason Morales — Founder, SolarEnergyPH
