Electrical Information Pages

These pages contain a variety of electrical information. Topics are being added and expanded regularly, so even if you have seen some pages before, there is probably something new.

To navigate within the topic pages, use the navigation menu at the left of each page. Photographs and diagrams can be enlarged by clicking on them.


13A / BS1363 Plugs - Wiring plugs and what not to do with them
Cables and Wiring - Electrical cables and wires of various types
Central Heating - Wiring details for central heating controls
Consumer Units - Consumer units and the items contained within, including circuit breakers, RCDs and RCBOs.
Installation Accessories - Installation materials and accessories for UK electrical installations
Installation Inspections - Examples of actual electrical installations and various problems encountered
Lamps & Lighting - Details of various lighting equipment including different types of lamps and luminaires
Lighting Circuits - Diagrams and methods of wiring lighting circuits
Saving Electricity - How to make savings for little or no cost
Socket Outlet Circuits - Wiring details for various types of socket outlet
Steel Conduit - Using and installing steel electrical conduit including threading, bending and the tools required
Supply Types - Incoming electricity supplies

Most recent update - 5th May 2020

NEW Combination Boiler with 2 Heating Zones, Volt Free Switching - Wiring diagrams for a combination boiler with two separate heating zones using volt free switching.
NEW Combination Boiler with 2 Heating Zones, Relay Switching - Wiring diagrams for a combination boiler with two separate heating zones with boiler switching via a relay.

Previous update - 3rd May 2020

Combination Boiler with 2 Heating Zones, 230V Switching - Wiring diagrams for two heating zones with a combination boiler that uses 230V switching.

Older update - 30th April 2020

Frost Thermostat wiring for central heating installations - Wiring diagrams for installing a pair of thermostats to prevent frost in water based central heating systems.

This section contains 94 pages of information.

Please read ALL of this page before anything else


Before working on any electrical circuits, switch off the power at the main fusebox or consumer unit, and confirm that the circuit is dead. DO NOT assume anything - faulty wiring or previous bodges could result in unexpected live wires.

Never work on a live circuit - it could easily kill you, or someone else in your family.


The information here relates to electrical wiring in the United Kingdom only. This is very important, as other countries will have different methods, standards and regulations for electrical work.

Part P

Part P is a section of the Building Regulations covering electrical work in England and Wales. While DIY work is still allowed, there are additional requirements to consider before starting any electrical work in your home. For further details, please see the Part P page.

Terms and Conditions

Please read the Terms and Conditions page.