> ## Documentation Index
> Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Kent G3 AC Wiring — Phase Order, Torque, and Sizing

> W-V-U phase sequence rule, 4–5 N·m torque across all AC ports, cross-section table, and sizing for 50 A pass-through current plus charging.

The Kent G3 has three AC terminal sets — GRID, Backup, and GEN — with a single phase-order rule that determines whether the machine ever syncs to the grid. Get the sequence right first, then work through the cable sizes and torque.

<Warning>
  **DANGER — verify 0 V AC** at all conductors with the OCPDs open before touching any terminal.
</Warning>

## Phase Sequence

Terminal labels on all three ports read **W(L3) · V(L2) · U(L1) · N · PE**. Match each terminal to the utility's actual phases, then verify rotation with a phase rotation meter before energizing. Wrong rotation blocks grid sync and raises phase alarms.

## Cables and Torque

| Port           | Cross-section       | Torque      |
| -------------- | ------------------- | ----------- |
| AC Grid        | 6–10 mm² (8–6 AWG)  | **4–5 N·m** |
| AC Backup      | 4–10 mm² (10–6 AWG) | **4–5 N·m** |
| AC GEN         | 4–10 mm² (10–6 AWG) | **4–5 N·m** |
| PE (all ports) | 10 mm² (6 AWG)      | **4–5 N·m** |

* Strip **13 mm**, crimp R-type connectors, and torque with a torque wrench — not by feel.
* Terminal maximum temperature is **85 °C**. Heat at a terminal means a workmanship issue, not an overloaded circuit.
* The backup loads panel must **not** be electrically connected to the main service panel.

<Warning>
  **4–5 N·m is this platform's AC terminal torque.** If you also work on the Kent M1, its AC torque is significantly lower. The figures are platform-specific and must not cross over. Side-by-side values live only on the [Mixed-Fleet Cheat Card](/mixed-fleet/cheat-card).
</Warning>

## Size for Pass-Through Plus Charging, Not Output

The grid side carries both battery charging current and up to **50 A continuous AC pass-through** to backup loads simultaneously. Grid-side max input current is:

| Model        | Max input current per phase | Max grid-side input power |
| ------------ | --------------------------- | ------------------------- |
| Kent G3 10KW | 22.8 A                      | 15 kW                     |
| Kent G3 12KW | 27.3 A                      | 18 kW                     |
| Kent G3 15KW | 34.2 A                      | 22.5 kW                   |

Size cables and OCPDs to these **input** figures plus local code requirements. Never size to the output kW rating alone — the grid side draws roughly 1.5× the inverter's own rated output.

## Backup Behaviour to Know While Wiring

* Transfer to backup: **\< 10 ms**
* Overload capacity: **2× rated power for 10 seconds**
* Maximum phase imbalance: **50%**

Per-phase backup promises follow the platform's unbalanced-output rules — see the unbalanced-output validation warning in [Settings Reference](/g3/settings-reference).

## Common Mistakes

* U and W swapped because the wire colours seemed to match — use a rotation meter, always.
* Grid OCPD sized to the output kW on a 15 kW unit that draws 34.2 A per phase while charging.
* Backup subpanel bridged to the main panel during testing and the bridge never removed.
* Terminals torqued by feel — 4–5 N·m requires a torque wrench.

## Related Pages

* [Kent G3 Earthing](/g3/earthing)
* [Kent G3 CT & Meter](/g3/ct-and-meter)
* [Mixed-Fleet Cheat Card](/mixed-fleet/cheat-card)