Site Science

Site Science: trade knowledge, made simple.

Short visual explainers for UK electricians and apprentices: continuity, insulation resistance, Zs, RCDs, ring finals, EICR codes and more. One idea at a time, drawn the way the job actually looks. Useful for 2391, AM2 and Level 2 & 3.

📘 Free download: Electrical Testing Quick Revision Guide. A 4-page PDF with the testing sequence, Zs worked through and the key formulas.
👉 https://sitescience.uk/free-guide

General guidance only. Always follow the current edition of BS 7671 and the IET Guidance Notes.