29/07/2025
The image you provided is a simplified electrical wiring diagram, likely for a basic residential setup, demonstrating how a meter, circuit breakers, a light, and a power outlet are connected.
Let's break down the components and connections:
* Electricity Meter: On the far left, there's an electricity meter, labeled "Shenzhen Star Instrument Co. Ltd. China." This device measures electricity consumption.
* It shows incoming wires (red, black, yellow) and outgoing wires (red, black, blue).
* The "220 V" label indicates the system voltage, typical for single-phase household power in many parts of the world, including Cambodia.
* Main Circuit Breaker (Sica C32): The first blue-handled circuit breaker to the right of the meter is likely the main incoming breaker.
* It's a "Sica" brand breaker, rated "C32," which means it has a 32 Ampere nominal current and a "C" type tripping curve (suitable for general-purpose protection).
* It receives power from the meter and distributes it to the rest of the panel.
* Residual Current Device (RCD) / Earth Leakage Circuit Breaker (ELCB) - Schneider: The middle, orange-handled device is a "Schneider" branded RCD or ELCB.
* This is a crucial safety device designed to protect against electric shock by detecting small imbalances in current (earth leakage faults) and quickly disconnecting the power.
* It's connected after the main circuit breaker, providing earth fault protection for the circuits downstream.
* Circuit Breakers for Loads (Sica C32): To the right of the RCD, there are two more "Sica C32" circuit breakers. These are typically for individual circuits, protecting specific loads from overcurrents and short circuits.
* Loads:
* Light Circuit: One of the circuit breakers feeds a light fixture (an LED bulb in a socket). There's also a single-pole switch in series with the light, allowing it to be turned on and off.
* Red wire: Phase (Live)
* Blue wire: Neutral
* Power Outlet (Socket): The other circuit breaker feeds a two-pin power outlet (socket).
* Red wire: Phase (Live)
* Blue wire: Neutral
* Green wire: Earth (Ground) - Crucially, the green wire from the outlet goes back to a connection point that appears to be the earth terminal block, indicated by a green wire going back towards the meter/main distribution point. This is essential for safety, providing a path for fault currents to earth.
Wiring Color Code:
* Red: Phase (Live) wire, carrying the main voltage.
* Blue: Neutral wire, typically at or near ground potential, completing the circuit.
* Green: Earth (Ground) wire, a safety conductor.
* Yellow: Appears to be an additional phase or possibly a different live conductor from the meter, but its connection is less clear in relation to the rest of the setup. In a typical single-phase 220V system, you'd primarily see one live and one neutral. It might represent the incoming live from the utility before splitting to the internal live.
Overall Purpose:
This diagram illustrates a common and basic electrical distribution setup. Power comes from the meter, passes through a main breaker for overall protection, then through an RCD for shock protection, and finally branches out to individual circuit breakers for separate loads like lighting and power outlets, each with appropriate live, neutral, and earth connections. The inclusion of the RCD highlights a focus on safety.