Part 6: Inspection and Testing - What You Need to Know

Overview of Part 6

Part 6 of BS 7671 deals with the inspection and testing of electrical installations. Although it has fewer questions (28 in our question bank), it’s critically important for both the exam and real-world practice.

Key Concepts

Initial Verification (Chapter 61)

Before an installation is put into service, it must undergo initial verification comprising:

• Visual inspection: Checking for compliance without instruments
• Testing: Using appropriate test instruments to verify safety

Inspection Requirements (Section 611)

Visual inspection should confirm:

• Correct connection of conductors
• Adequate conductor sizing
• Presence of fire barriers and seals
• Proper labelling and identification
• Accessibility of equipment for maintenance

Testing Sequence (Section 612)

Tests must be carried out in a specific order:

1. Continuity of protective conductors
2. Continuity of ring final circuit conductors
3. Insulation resistance
4. Polarity
5. Earth fault loop impedance
6. RCD operation

Periodic Inspection (Chapter 62)

Existing installations require periodic inspection to determine:

• Safety for continued use
• Any deterioration or damage
• Changes that may have occurred since last inspection

Common Exam Questions

Part 6 questions often focus on:

• The correct sequence of tests
• Minimum acceptable insulation resistance values
• When periodic inspection is required
• Documentation requirements (electrical installation certificates)

Practice Part 6 Questions

Test your knowledge with our Part 6 practice quiz containing 28 focused questions on inspection and testing procedures.

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