Reference Library
Wiring Guides & References
Practical guides written from the tools up — not from a textbook. Installation methods, colour codes, testing procedures, and safety practices.
9 guides
Beginner7 min read
Safe Isolation Procedure
The correct sequence for proving a circuit dead before you work on it. Non-negotiable.
SafetyRead →
Beginner6 min read
Cable Colour Codes — All Regions
Side-by-side conductor colours for the UK, Europe, North America and Australia/New Zealand — plus the old codes you'll still meet.
StandardsRead →
Intermediate8 min read
RCD Types — AC, A, F and B Explained
Which residual current device to fit, why it matters for EV chargers, solar and VSDs, and what the ratings mean.
SafetyRead →
Intermediate10 min read
Earthing Systems — TN-S, TN-C-S and TT Explained
How the supply earth is arranged, how to tell which one you have, and what each means for protection.
StandardsRead →
Intermediate9 min read
Insulation Resistance Testing (IR Test)
How to perform and read a 250 V / 500 V insulation resistance test, and what a low reading is telling you.
TestingRead →
Intermediate11 min read
Earth Fault Loop Impedance — Step by Step
Measure Ze and Zs, understand the loop, and verify the protective device will disconnect fast enough.
TestingRead →
Intermediate9 min read
Conduit Fill & Cable Capacity
Work out how many cables fit in a conduit without overheating or damaging insulation on the pull.
CalculationsRead →
Intermediate10 min read
Maximum Demand & Diversity for a House
Size the main switch and supply conductors realistically — because everything is never on at once.
CalculationsRead →
Beginner8 min read
Single-Phase Socket Outlet Wiring
Ring finals vs radials, correct terminations, spurs, and the checks before you screw it back to the wall.
WiringRead →