Figure 1 shows a layout of final circuits to be wired using PVC sheathed wiring system such that: a) Lamps L and Lare connected in parallel and controlled from S1 and S2; b) S1 controls lamp L1; c) Socket outlets S/O1, S/O2 and S/O3 are connected in radial.

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=\tiny]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 \node (cu) at (0,0) [cu] {}; \node at (cu.north west) [anchor=north west, xshift=0.1cm, yshift=-0.2cm] {L}; \node at (cu.west) [anchor=west, xshift=0.1cm, yshift=0.2cm] {N}; \node at (cu.south west) [anchor=south west, xshift=0.1cm, yshift=0.2cm] {E}; % MCBs/RCBOs \node (mcbo1) at (0.5, 1.0) [mcbo=6A] {}; \node (mcbo2) at (0.5, 0.0) [mcbo=6A] {}; \node (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 \node (nbar) at (-0.5, -0.5) [draw, rectangle, minimum width=0.2cm, minimum height=2cm, label={[font=\tiny]left:N Bar}] {}; \draw[neutral] (cu.west) -- (nbar.north); % Earth bar \node (ebar) at (-0.5, -1.5) [draw, rectangle, minimum width=0.2cm, minimum height=2cm, label={[font=\tiny]left:E Bar}] {}; \draw[earth] (cu.south west) -- (ebar.north); % Circuit 1: Lamps L1 & L2 in parallel, controlled by S1 & S2 (Two-way switching) \node (s1) at (3, 1.5) [switch, label=below:$S_1$] {}; \node (s2) at (5, 1.5) [switch, label=below:$S_2$] {}; \node (l1) at (7, 2.5) [lamp, label=below:$L_1$] {}; \node (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) \node (s3) at (3, -0.5) [switch, label=below:$S_3$] {}; \node (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 \node (so1) at (3, -2.5) [socket, label=below:$S/O_1$] {}; \node (so2) at (5, -2.5) [socket, label=below:$S/O_2$] {}; \node (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