Free mock exam
Level 3 Inspection, Testing & Commissioning Mock Exam
Free mock exam for Level 3 Electrical apprentices on Inspection, Testing and Commissioning. 30 questions from a 340-question bank covering the BS 7671 testing sequence per GN3, initial verification, periodic inspection (EICR), RCD test methods, MFT use, polarity, continuity, insulation resistance and the certification process.
- Questions
- 30
- Time limit
- 35 min
- Pass mark
- 70% · 21/30
- Question bank
- 340
Free, no sign-up. Retake as many times as you like — different questions each time.
Sample questions
01Under the Electricity at Work Regulations 1989 Reg 14, live working is only permitted when:
- AIt would cause unacceptable disruption to make dead, OR the client refuses isolation, OR insulated tools are available on site
- BIt is unreasonable in all the circumstances to make dead, AND it is reasonable to work live, AND suitable precautions are taken
- CThe supply voltage does not exceed 230V, AND the circuit is protected by a 30mA RCD, AND the worker holds a current ECS card
- DThe duty holder has issued a written permit-to-work, AND a second competent person is present, AND the work lasts no longer than one hour
Why: EAWR 1989 Reg 14 imposes three cumulative tests. All three must be met; failing any one makes live working a criminal offence under the Regulations.
02During safe isolation before inspection and testing, which instrument and method prove the circuit dead?
- AAn approved two-pole voltage indicator to GS38, confirmed on a known source before and after testing between all conductors at the point of work
- BAn insulation resistance tester, as a high reading shows the circuit is dead
- CA multimeter on its voltage range, tested once line to neutral
- DA non-contact voltage pen, held against each cable at the board
Why: Use an approved two-pole voltage indicator with GS38 leads and probes, not a multimeter or a voltage pen. Prove it on a known source or proving unit, test between all conductors at the point of work, then prove it again. On-Site Guide Figure M.2 secures (locks off) after verifying dead; HSE HSG85 and Electrical Safety First BPG2 lock off and post the notice before proving dead. Both are recognised, so follow your employer's or assessment centre's procedure.
03Which test instrument is the ONLY device acceptable for proving dead during safe isolation?
- AA non-contact voltage detector (volt-stick), as it requires no physical contact with live parts
- BA two-pole approved voltage indicator with leads and probes complying with GS38
- CA digital multimeter set to its AC voltage range, provided the leads carry fused probes
- DA mains-test neon screwdriver (single-pole), provided it is checked against a known live source first
Why: HSE GS38 requires a dedicated two-pole voltage indicator with finger-barriers, fused tips, and probes exposing no more than 4mm of metal. Multimeters and neons are explicitly unsafe.
Common questions
Is the Level 3 Inspection, Testing & Commissioning mock exam free?
Yes, it is free with no sign-up needed. Questions are pulled at random from a substantial bank, with a worked explanation on every question after you submit.
Can I retake the mock exam?
Yes. Every attempt picks a different random selection and reshuffles the options, so each retake gives you genuinely new questions. No limit on retakes.
Does this count as a qualification?
No. This is independent practice material and does not award a qualification, card or certificate. Where a subject has a formal qualification or card, you gain it through an approved provider.