TASK 1: Draw the wiring diagram

Question

ScanSolve AI Tutor · Accepted Answer

**TASK 1: Draw the wiring diagram**

Here is the wiring diagram for the specified circuits. It includes a consumer unit (CU) with individual protective devices (MCBs/RCBOs) for each circuit.

$$
\begin{tikzpicture}[
    font=\small,
    switch/.style={circuit ee IEC, toggle switch, scale=0.7},
    lamp/.style={circuit ee IEC, lamp, scale=0.7},
    socket/.style={circuit ee IEC, receptacle, scale=0.7},
    cu/.style={draw, thick, rectangle, minimum width=2cm, minimum height=3cm, align=center, label={[font=\small]above:Consumer Unit}},
    mcbo/.style={draw, rectangle, minimum width=0.5cm, minimum height=0.8cm, align=center, label={[font=	iny]right:#1}},
    wire/.style={thick},
    earth/.style={thick, dashed},
    neutral/.style={thick, dotted},
    live/.style={thick, solid},
    junction/.style={circle, fill, inner sep=1.5pt}
]

% Consumer Unit

ode (cu) at (0,0) [cu] {};

ode at (cu.north west) [anchor=north west, xshift=0.1cm, yshift=-0.2cm] {L};

ode at (cu.west) [anchor=west, xshift=0.1cm, yshift=0.2cm] {N};

ode at (cu.south west) [anchor=south west, xshift=0.1cm, yshift=0.2cm] {E};

% MCBs/RCBOs

ode (mcbo1) at (0.5, 1.0) [mcbo=6A] {};

ode (mcbo2) at (0.5, 0.0) [mcbo=6A] {};

ode (mcbo3) at (0.5, -1.0) [mcbo=20A] {};

% Connections from CU to MCBs
\draw[live] (cu.north west) -- (mcbo1.north);
\draw[live] (cu.north west) -- (mcbo2.north);
\draw[live] (cu.north west) -- (mcbo3.north);

% Neutral bar

ode (nbar) at (-0.5, -0.5) [draw, rectangle, minimum width=0.2cm, minimum height=2cm, label={[font=	iny]left:N Bar}] {};
\draw[neutral] (cu.west) -- (nbar.north);

% Earth bar

ode (ebar) at (-0.5, -1.5) [draw, rectangle, minimum width=0.2cm, minimum height=2cm, label={[font=	iny]left:E Bar}] {};
\draw[earth] (cu.south west) -- (ebar.north);

% Circuit 1: Lamps L1 & L2 in parallel, controlled by S1 & S2 (Two-way switching)

ode (s1) at (3, 1.5) [switch, label=below:$S_1$] {};

ode (s2) at (5, 1.5) [switch, label=below:$S_2$] {};

ode (l1) at (7, 2.5) [lamp, label=below:$L_1$] {};

ode (l2) at (7, 0.5) [lamp, label=below:$L_2$] {};

\draw[live] (mcbo1.south) -- (s1.in); % Live to S1
\draw[live] (s1.out 1) -- (s2.in 1); % Strappers
\draw[live] (s1.out 2) -- (s2.in 2); % Strappers
\draw[live] (s2.out) -- (l1.in); % Switched live to L1
\draw[live] (s2.out) -- (l2.in); % Switched live to L2 (parallel)

\draw[neutral] (nbar.east) |- (l1.out); % Neutral to L1
\draw[neutral] (nbar.east) |- (l2.out); % Neutral to L2

\draw[earth] (ebar.east) |- (s1.west); % Earth to S1
\draw[earth] (ebar.east) |- (s2.west); % Earth to S2
\draw[earth] (ebar.east) |- (l1.west); % Earth to L1
\draw[earth] (ebar.east) |- (l2.west); % Earth to L2

% Circuit 2: Lamp L3 controlled by S3 (One-way switching)

ode (s3) at (3, -0.5) [switch, label=below:$S_3$] {};

ode (l3) at (7, -0.5) [lamp, label=below:$L_3$] {};

\draw[live] (mcbo2.south) -- (s3.in); % Live to S3
\draw[live] (s3.out) -- (l3.in); % Switched live to L3

\draw[neutral] (nbar.east) |- (l3.out); % Neutral to L3

\draw[earth] (ebar.east) |- (s3.west); % Earth to S3
\draw[earth] (ebar.east) |- (l3.west); % Earth to L3

% Circuit 3: Radial Socket Outlets S/O1, S/O2, S/O3

ode (so1) at (3, -2.5) [socket, label=below:$S/O_1$] {};

ode (so2) at (5, -2.5) [socket, label=below:$S/O_2$] {};

ode (so3) at (7, -2.5) [socket, label=below:$S/O_3$] {};

\draw[live] (mcbo3.south) -- (so1.in 1); % Live to S/O1
\draw[neutral] (nbar.east) |- (so1.in 2); % Neutral to S/O1
\draw[earth] (ebar.east) |- (so1.in 3); % Earth to S/O1

\draw[live] (so1.in 1) -- (so2.in 1); % Live to S/O2
\draw[neutral] (so1.in 2) -- (so2.in 2); % Neutral to S/O2
\draw[earth] (so1.in 3) -- (so2.in 3); % Earth to S/O2

\draw[live] (so2.in 1) -- (so3.in 1); % Live to S/O3
\draw[neutral] (so2.in 2) -- (so3.in 2); % Neutral to S/O3
\draw[earth] (so2.in 3) -- (so3.in 3); % Earth to S/O3

\end{tikzpicture}
$$

**TASK 2: Estimate the materials required for the project**

This estimation assumes a typical domestic installation on a practical working board, with approximate lengths for a small setup.

*   **Consumer Unit (CU):**
    *   1 x 4-way or 6-way Consumer Unit with Main Switch and RCD/RCBO protection.
    *   2 x 6A MCB/RCBO (for lighting circuits).
    *   1 x 20A or 32A MCB/RCBO (for radial socket circuit).
*   **Cables (PVC Sheathed Twin and Earth):**
    *   Approx. 40 m of 1.5 mm² 2C+E PVC T&E cable (for lighting circuits).
    *   Approx. 20 m of 2.5 mm² 2C+E PVC T&E cable (for radial socket circuit).
    *   Approx. 5 m of 4.0 mm² or 6.0 mm² 2C+E PVC T&E cable (for main supply to CU, if required).
*   **Switches:**
    *   2 x One-gang Two-way switches (for S1, S2).
    *   1 x One-gang One-way switch (for S3).
*   **Lamp Holders:**
    *   3 x Batten lamp holders or pendant sets (for L1, L2, L3).
*   **Lamps/Bulbs:**
    *   3 x LED lamps (e.g., 9W).
*   **Socket Outlets:**
    *   3 x 13A Switched Socket Outlets (single or double gang, e.g., single gang for S/O1, S/O2, S/O3).
*   **Mounting Accessories:**
    *   3 x Single-gang surface mounting boxes (for switches).
    *   3 x Single-gang surface mounting boxes (for socket outlets).
    *   Cable clips/saddles (e.g., 100 assorted sizes).
    *   Screws and wall plugs (assorted sizes).
*   **Earthing Accessories:**
    *   Earth sleeving (green/yellow).
    *   Earth terminals/connectors.

**TASK 3: Install and wire the circuits on the assigned working board in accordance with the relevant regulations requirement and codes of

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