NABTEB Electrical Installation 2020 Past Questions & Answers
Practise all 9 NABTEB Electrical Installation questions from the 2020 exam, each with a worked answer and explanation. Free CBT-format practice on web, iOS and Android.
8 questions from the 2020 NABTEB Electrical Installation paper
Try them on paper first. The correct options and worked answers are in the app.
1.What is the main purpose of the consumer unit in a domestic installation?
- A.To step down the supply voltage
- B.To distribute the supply to various circuits and provide overcurrent protection
- C.To meter the electricity consumption
- D.To convert AC to DC supply
2.In a balanced three-phase system, the line voltage is 415V. What is the phase voltage?
- A.415 V
- B.240 V
- C.208 V
- D.720 V
3.When calculating the space factor for cables in trunking, the maximum fill should not exceed:
- A.25% of the trunking cross-sectional area
- B.45% of the trunking cross-sectional area
- C.65% of the trunking cross-sectional area
- D.85% of the trunking cross-sectional area
4.A Megger (insulation resistance tester) applies a test voltage of 500V DC to measure:
- A.Circuit resistance in ohms
- B.Insulation resistance in megaohms
- C.Earth fault loop impedance
- D.Prospective fault current
5.Before working on an electrical installation that has been isolated, what is the correct procedure?
- A.Start work immediately after switching off the main switch
- B.Switch off, lock off, prove dead with an approved voltage indicator, then proceed
- C.Switch off and use a neon screwdriver to test
- D.Ask a colleague to confirm the circuit is dead verbally
6.Power factor correction capacitors are connected in which configuration to the supply?
- A.In series with the load
- B.In parallel with the load
- C.Between phase and neutral only
- D.Between neutral and earth
7.On an electrical layout drawing, a triangle symbol typically represents:
- A.A fan outlet
- B.A switch
- C.A distribution board
- D.An earth connection
8.An HRC (High Rupturing Capacity) fuse is preferred over a rewireable fuse because it:
- A.Is cheaper to replace
- B.Can be repaired on site
- C.Has a precisely known breaking capacity and time-current characteristic
- D.Does not need to be replaced after operating
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Sign up to see answersAbout the 2020 NABTEB Electrical Installation paper
These are real NABTEB Electrical Installation questions from the 2020 exam, sourced from the official paper. Paper 1 (Objective) + Paper 2 (Essay) per subject. Practising a specific year shows you the style and difficulty the examiners set that year — useful for spotting recurring topics across 2005–2024.
Preparing for the NABTEB Electrical Installation 2020 theory paper
The 2020 NABTEB Electrical Installation paper has an objective section and a theory (essay) section — and both test the same syllabus. ExamPadi gives you the objective questions in CBT format with worked answers, the most efficient way to master the topics and the recall the theory paper rewards too.
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NABTEB Electrical Installation 2020 — frequently asked
How many NABTEB Electrical Installation 2020 past questions are there?
ExamPadi has 9 NABTEB Electrical Installation questions from the 2020 exam, each with a worked answer and explanation.
Are the 2020 NABTEB Electrical Installation answers included?
Yes — every question has a worked answer, not just the correct option.
Does this help with the NABTEB Electrical Installation 2020 theory paper too?
ExamPadi gives you the objective (multiple-choice) NABTEB Electrical Installation questions, each with a worked answer. The objective and theory papers test the same syllabus, so drilling these questions is also strong preparation for the 2020 theory paper.
Can I download the NABTEB Electrical Installation 2020 questions and answers as a PDF?
You can practise every 2020 NABTEB Electrical Installation question and answer free on the ExamPadi web and mobile apps, and the mobile app saves them for offline study — a faster, always-corrected alternative to a static PDF download.
Can I practise NABTEB Electrical Installation 2020 free?
Yes. The free tier gives 20 questions per day across any subject and year. Pro removes the cap and unlocks full timed mock exams.