Installation technology

Regulations and certificates, supply and earthing systems, protective devices, earthing and bonding, and final circuits. Work through the topics in order. Each ends with a mini test.

1. Regulations and documentsWhich rules are law and which are guidance, what BS 7671 is, Part P notifiable work, and the certificates you fill in.6-question test
2. Supply systems and earthing arrangementsUK supply voltages, conductor colours, and the difference between TN-S, TN-C-S (PME) and TT earthing.6-question test
3. Protective devicesOverload, short circuit and earth fault, then fuses, MCBs, RCDs and RCBOs: what each one does and where it's used.6-question test
4. Earthing, bonding and disconnection timesAutomatic disconnection of supply, the earthing conductor and main protective bonding, conductor sizes and disconnection times.6-question test
5. Final circuitsRing finals, radials and lighting circuits: typical device ratings, cable sizes, floor areas and spur rules.6-question test