Make AC Power Connections to Supply and Load Panels

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Warning
Before making the AC power connections, turn the AC circuit breaker of the main service disconnect OFF and secure it against reconnection.
In each of the following steps:
  • Strip the ends of the wires, install ferrules, and insert into the corresponding Backup Gateway terminal lugs.
  • Using an M3 Allen bit, tighten the lugs to 4 Nm.
  1. If the site short circuit current is between 10 kA and 16 kA, install 22x55mm DIN-mounted fuse holder and 22x58mm type aM cartridge fuse on the Backup Gateway's internal DIN rail. The fuse must be replaced in the cable between the Backup Gateway and the grid. See Grid Supply Fuse and Fuse Holder for additional information about fuse requirements.
  2. Connect the main service conductors to the Backup Gateway Supply terminals according to the diagrams on the following page.
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    CAUTION
    Where site-level Residual Current Devices (RCDs) or Residual Current Circuit Breakers with Overcurrent Protection (RCBOs) are required, one of the following methods must be used to avoid risk of upstream RCD / RCBO nuisance tripping:
  3. Connect the home load panel conductors to the Backup Gateway terminals according to the table on the following page.
  4. Depending on the quantity of Non-Backup circuits, a Non-Backup panel will be required. Connect the conductors (Line(s), Neutral, and Protective Earth) from the Non-Backup panel to the Backup Gateway's Non-Backup terminals.

    Non-Backup circuits include: 3-phase PV inverters, 3-phase loads, large single-phase loads.

  5. Connect the non-backup panel conductors to the Backup Gateway Non-Backup terminals according to the table on the following page. Any circuits connected here will not be powered when disconnected from the grid. During on-grid operation, these circuits are still metered by the internal site metering with no additional metering hardware required.
Warning IconA warning icon, calling your attention to a possibly risky situation
Warning
Installing 3-phase equipment on the backup circuit may result in equipment damage. The only exceptions to this rule are the Tesla Wall Connector or sockets feeding Tesla Mobile Connectors (please see the Vehicle Charging During Power Outage page for more information). The Powerwall system's backup phase should be connected to L1 of the Wall Connector or Mobile Connector socket.
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Warning
Always ensure all equipment is safely de-energized and locked out prior to working, to prevent risk of electric shock. To avoid shock hazard, never power on the system without a connection to Earth at the Gateway. The Earth bar and backplate voltage may float when ungrounded. If conducting earth loop impedance testing, ensure the Gateway always has a suitable Earth connection.
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Warning
Incorrect wiring of AC conductors presents a risk of electrical shock or damage to equipment. Before energizing the system, ensure all connections are made correctly according to the instructions in this document and in accordance with local wiring codes and regulations.
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CAUTION
To ensure IP55 ingress protection, appropriate fittings and/or cable glands must be used to secure all cables passing into the enclosure.

Refer to Appendix B: Wiring Reference for all wiring requirements and recommendations, including wire colors and gauges.

Refer to Appendix C: System Wiring Diagrams for example system wiring diagrams.

Table 1. Conductor Connections for Single Phase (left) and Three-Phase (right)
Single Phase Three-Phase
Supply Connections
Home Load and Backup Connections
Non-Backup Connections
Terminal Maximum Wire Gauge Strip Length Torque
Supply 35 mm2 12.5 mm 4 Nm
Non-Backup 35 mm2 12.5 mm 4 Nm
Home (Backup) 35 mm2 12.5 mm 4 Nm
Neutral terminal bar 25 mm2 12.5 mm 4 Nm
PE terminal bar 25 mm2 12.5 mm 4 Nm