Where’s the job?

Overview

• Upgrading and installing fuseboards and consumer units boosts electrical safety and efficiency.

• Skill level: 4 / 5 (requires careful wiring, compliance with BS7671, and systematic labelling).

• Typical duration: 1 – 2 days depending on circuit complexity and layout.

Safety First

• Always disconnect the mains supply and verify absence of voltage with a tester before starting work.

• Use only certified components and follow BS7671 wiring regulations.

• Ensure proper segregation of circuits, correct earthing and adequate circuit protection.

• Wear appropriate PPE and work with a second person where possible.

• Double-check all connections and tighten terminal blocks securely to avoid loose wiring.

Tools & Materials

Step-by-Step

1. Isolate the mains supply, then switch off and secure the existing fuseboard or consumer unit.

2. Remove old wiring and label circuits for accurate reconnection.

3. Mount the new consumer unit securely, ensuring adequate spacing and ventilation.

4. Reconnect each circuit to its designated terminal and double-check the labels.

5. Use a multimeter or circuit tester to confirm continuity and correct wiring before re-energising.

6. Switch on the mains and monitor each circuit to ensure proper function without tripping breakers.

7. Finalise by tidying wiring, updating circuit schedules and affixing safety notices where required.

Completion Checks

• All circuits are correctly labelled, with secure connections and verified continuity.

• The consumer unit meets BS7671 standards and has passed electrical testing.

• Documentation and certification are complete, ensuring compliance with regulations.

• The system operates without nuisance tripping and is safe to use.

When to Call a Pro Instead

If the upgrade involves reconfiguring wiring circuits, significant modifications to existing installations, or if you are not a registered electrician, it is prudent to call a professional to ensure full compliance and safety.