City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)

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For electricians in the United Kingdom, the City & Guilds Level 3 Award in Initial Verification and Periodic Inspection and Testing of Electrical Installations (2391-52) represents the “gold standard” of professional competence. Often referred to simply as the “2391-52,” this qualification is the gateway to high-level consultancy, specialized inspection work, and achieving “Qualified Supervisor” status within industry bodies like NICEIC or NAPIT.

This comprehensive guide provides everything you need to know about the exam, from eligibility and registration to the intricate details of the practical assessment and theory exams.

What is the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)?

The C&G 2391-52 is a combined qualification that covers both the Initial Verification of new installations and the Periodic Inspection and Testing (Electrical Installation Condition Reports – EICR) of existing ones.

  • Official Exam Name: City & Guilds Level 3 Award in Initial Verification and Periodic Inspection and Testing of Electrical Installations (2391-52).
  • Conducting Body: City & Guilds of London Institute, a global leader in skills development and vocational education founded in 1878.
  • Purpose of Exam: Professional Certification. It validates an electrician’s ability to inspect, test, and certify electrical installations in accordance with the latest BS 7671 Wiring Regulations.
  • Geographic Validity: Primarily recognized across the United Kingdom (England, Wales, Scotland, and Northern Ireland). It is also highly regarded in Commonwealth countries and international projects following British Standards (BS 7671).
  • Level of Competence: Specialist/Advanced Level. It is significantly more demanding than entry-level installation qualifications and demonstrates a mastery of fault-finding and regulatory compliance.
  • Brief History: The 2391-52 was introduced in 2017 to replace the separate 2394 (Initial) and 2395 (Periodic) qualifications, streamlining the process for experienced electricians who need to perform both types of inspections.

Who Can Take the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)? (Eligibility Requirements)

This is not an entry-level course. Candidates are expected to have a foundational understanding of electrical principles and significant “on-the-tools” experience.

Eligibility Summary Table

Requirement Details
Academic Prerequisite Level 3 Award in the Requirements for Electrical Installations (BS 7671:2018+A2:2022) – The “18th Edition.”
Experience Suggested minimum of 2-3 years of post-qualification installation experience.
Language Proficiency English (Level 2 equivalent). No formal IELTS score required, but must be able to read complex technical regulations.
Age Limit 18 years or older.
Documentation Valid ID (Passport/Driving License), certificates of prior electrical qualifications.

Documentation Checklist:

  • Academic Transcripts: Proof of C&G 2365 Level 3 or C&G 2357 (NVQ Level 3).
  • 18th Edition Certificate: Must be the most recent version (BS 7671:2018 Amendment 2).
  • ID Proof: Photographic identification is mandatory for the online exam and practical assessment.
  • Professional Reference: While not always mandatory, many training centers require a signed declaration of experience.

How to Register for the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)

Exam Schedule & Availability

Unlike some academic exams, the 2391-52 is available on-demand. Because it is delivered through City & Guilds approved training centers, you can book a slot whenever a center has availability. Most centers run courses monthly.

Exam Fees (Detailed Breakdown)

Fees vary by training provider, as they include both the C&G registration fee and the cost of the training/facilities.

Fee Type Estimated Cost (GBP)
City & Guilds Registration Fee £75 – £100
Training Course (4-5 Days) £450 – £650
Online Exam Fee (included in course) £50 (if retaking)
Practical Assessment Fee £150 – £250 (if retaking)
Total Estimated Cost £600 – £950

Booking Process

  1. Find a Center: Use the City & Guilds “Find a Center” tool or choose a reputable provider like NICEIC, NAPIT, or a local FE College.
  2. Verification: Provide copies of your Level 3 Installation and 18th Edition certificates.
  3. Payment: Pay the deposit or full fee to secure your dates.
  4. Preparation: Receive your joining instructions and pre-reading materials (usually focused on Guidance Note 3).

Retake Policy

  • Online Exam: Can be retaken as soon as the center can book a new slot (usually within 48 hours).
  • Practical/Written: Centers may require a waiting period for remedial training.
  • Attempts: There is no official limit on attempts, but you must pay for each retake.

Score Validity

The 2391-52 qualification has lifetime validity. However, as the Wiring Regulations (BS 7671) change, you may be required to take “update” courses to remain compliant with industry bodies.

City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52) Exam Format & Structure

Exam Anatomy

The 2391-52 consists of three distinct components that must all be passed to achieve the award.

Component Format Duration Details
2391-052 Online Multiple Choice 120 Minutes 60 Questions, Open Book (BS 7671 & GN3).
2391-502 Written Assignment ~90 Minutes Scenario-based questions on inspection and testing.
Practical Performance Test 4 – 5 Hours Full inspection and test on a simulated rig.

Syllabus & Content Domains

Domain Topics Covered Weightage (Online)
Requirements Statutory requirements, Electricity at Work Regs 1989. 10%
Safety Safe isolation, PPE, Risk Assessment. 15%
Initial Verification Visual inspection, sequence of tests, certification. 25%
Periodic Inspection Condition reporting, sampling, identifying defects. 30%
Test Results Interpretation of readings, PFC, Zs, RCD trip times. 20%

Official Reference Materials

  • BS 7671:2018+A2:2022: The Requirements for Electrical Installations.
  • IET Guidance Note 3: Inspection & Testing (The “Bible” for this exam).
  • IET On-Site Guide: For quick reference of standard circuits.

How is the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52) Scored?

Passing Score

  • Online Exam (2391-052): The pass mark is typically around 80% (48 out of 60). This is higher than most C&G exams due to the safety-critical nature of the work.
  • Written & Practical: These are marked as Pass/Fail. You must complete every task correctly to pass. A single failure in a “critical” safety task (like Safe Isolation) results in an immediate fail.

Scoring Mechanics

  • Negative Marking: None. You should answer every question.
  • Open Book: You are allowed to use BS 7671 and Guidance Note 3 during the online exam. However, the time limit (2 minutes per question) means you must know where to find information quickly.

Result Declaration

Online exam results are usually provided instantly upon completion. Practical and written results are typically confirmed by the center within 5-10 working days after internal and external verification.

How Difficult is the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)?

Overall Difficulty Rating: Very Difficult / Challenging.

The 2391 series has a reputation for being the “electrician’s nightmare.” While the modular 2391-52 is more accessible than the old 2391-10 (which had a pass rate of roughly 25%), it remains a significant hurdle.

Historical Pass Rates

Attempt Type Estimated Pass Rate
First-time Pass Rate 45% – 55%
Overall Pass Rate (after retakes) 75%

Most Challenging Topics

  • Earth Fault Loop Impedance (Zs) Calculations: Understanding how to adjust for temperature and parallel paths.
  • Scenario Interpretation: Deciding whether a defect is a C1, C2, or C3 on an EICR.
  • Sequence of Tests: Failing to follow the correct sequence in the practical exam is a common reason for failure.

City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52) vs. Similar Certifications

Feature C&G 2391-52 EAL Level 3 (603/2625/6) Logic4Training L3
Conducting Body City & Guilds EAL Logic4Training (LCL)
Exam Style Open Book / Practical Open Book / Practical Open Book / Practical
Difficulty Very High High Moderate
Industry Recognition Highest (Gold Standard) High Moderate

When to choose C&G 2391-52: If you want the most prestigious credential that is universally accepted by all UK employers and CPS schemes.

How to Prepare for the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)

Recommended Study Timeline

  • Total Preparation Time: 40 – 60 hours of study + 5-day intensive course.
  • Phase 1 (Weeks 1-2): Master Guidance Note 3. Read it cover to cover.
  • Phase 2 (Weeks 3-4): Practice “Dead Testing” and “Live Testing” sequences on-site.
  • Phase 3 (Final Week): Timed practice exams for the 60-question online test.

Best Study Resources

  • ExamSuccess: Online practice simulators for the 2391-052.
  • LearningSpark: Excellent YouTube tutorials on 2391 practical tasks.
  • Christopher Kitcher: “Practical Guide to Inspection, Testing and Certification of Electrical Installations” (Essential textbook).

What to Expect on Exam Day

  • Arrival: Arrive 30 minutes early. You will need to present your ID.
  • The Online Exam: Taken in a proctored computer lab. You can bring your tabbed copies of BS 7671 and GN3.
  • The Practical: You will be given a “Test Rig” simulating a small domestic/commercial installation. You must perform:
    • Safe Isolation (If you fail this, the test ends immediately).
    • Visual Inspection.
    • Continuity of Protective Conductors.
    • Insulation Resistance.
    • Polarity.
    • Earth Fault Loop Impedance.
    • RCD Testing.
  • Prohibited Items: No mobile phones, smartwatches, or programmable calculators.

After Passing the City & Guilds Level 3 Award in Periodic Inspection (C&G 2391-52)

Once you pass, your certificate will arrive in the mail within 2-4 weeks. This opens several professional doors:

  • JIB Gold Card: You can apply to have “Inspection and Testing” added to your ECS Gold Card.
  • Qualified Supervisor: You meet the technical requirement to be the lead supervisor for a company registered with NICEIC or NAPIT.
  • EICR Specialist: You can legally and competently sign off Electrical Installation Condition Reports, a high-demand service for landlords.
  • Salary Increase: Electricians with the 2391-52 typically earn 15-20% more than those with only installation qualifications.

Frequently Asked Questions

  1. Is C&G 2391-52 open book? Yes, you can use BS 7671 and IET Guidance Note 3.
  2. What is the difference between 2391-50, 51, and 52? 2391-50 is Initial Verification only; 2391-51 is Periodic Inspection only; 2391-52 is the combined course covering both.
  3. Can I take this without the 18th Edition? Technically yes, but it is highly discouraged as the exam questions are based on 18th Edition regulations.
  4. Do I need to bring my own tester? Most centers provide calibrated testers (e.g., Megger or Fluke), but you can usually bring your own if it has a valid calibration certificate.
  5. What happens if I fail the practical but pass the online exam? You only need to retake the component you failed.
  6. Is there a written exam? Yes, the 2391-502 is a short-answer written scenario paper.
  7. How long does the certificate last? It does not expire.
  8. Is it harder than the old 2391-10? The format is more user-friendly, but the technical knowledge required is just as high.
  9. Can I use a digital copy of the regs? No, only physical books are allowed in the exam room.
  10. Is “sampling” allowed in the practical exam? No, for the practical assessment, you must test all circuits as specified by the examiner.

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