C&G 2391-52

Three elements: an online multiple-choice test, a practical assessment in which you inspect and test a rig and complete the associated schedules and certificate or report, and a short written assignment. All three must be passed. City & Guilds publishes the current structure and weighting on its website.

Realistically no. The practical assessment expects you to handle instruments competently and to recognise defects quickly, which only comes from doing the work. Most candidates arrive with a Level 3 installation qualification and some site experience. If you have never tested a real installation, build that experience first.

Candidates typically need several months of part-time study alongside work. The regulations content is broad but the practical skill is the slow part - you need repeated hands-on practice taking readings, recording them and interpreting them before the assessment feels comfortable.

Test sequence and interpretation. People can produce a reading but cannot say whether it is acceptable or what a poor result implies. Others muddle the record-keeping - ambiguous polarity, missing departure notes, incorrect classification codes on a condition report. Examiners probe reasoning, not just numbers.

Yes, and heavily. Prove dead, lock off, verify the tester on a known source, retest after isolation. Any sloppiness here can end the practical assessment regardless of how good your test results are. Treat it as the first thing you rehearse and the last thing you check.

Start with BS 7671 structure and the inspection schedule, then move to test methods in the order you would perform them on site. Work backwards from expected results, so you understand why a value is what it is. Only then attempt practice papers, and practise instrument use in parallel rather than after.

Individual components can usually be resat rather than the whole qualification, but the rules and any time limits are set by the awarding body. City & Guilds publishes current retake arrangements and fees on its site, and your training provider can confirm what applies to your registration.

It is widely considered demanding because it tests judgement and documentation as well as knowledge. There is no trick to it, but it punishes shallow learning: you cannot pass on memorised numbers alone, and the written and practical elements reward clear, accurate expression.

These are set and updated by City & Guilds, so look them up on its official website or ask your approved centre. Any figure quoted in forums or older study guides may be out of date. Plan around the current published arrangements rather than a remembered number.