Free mock exam
Power & Cabling — Fire Alarm Systems (BS 5839-1) Practice
Free topic-focused mock exam: all 20 questions on Power & Cabling, drawn from the wider Fire Alarm Systems (BS 5839-1) bank. 35-minute timer, 70% to pass, worked explanation on every question. Use this when you've taken the full mock once and want to drill the topics you got wrong.
- Questions
- 20
- Time limit
- 35 min
- Pass mark
- 70% · 14/20
- Question bank
- 20
Free, no sign-up. Retake as many times as you like — the questions are reshuffled, with the answer order changed.
Sample questions
01What is the minimum standby battery duration for most fire alarm systems?
- A8 hours
- B24 hours
- C72 hours
- D4 hours
Why: Clause 24.3.5a): for Category M and L systems in most buildings, the standby battery should run the system for at least 24 h and then give an Evacuate signal in all alarm zones for at least 30 min. With an automatically started standby generator serving the system this drops to 6 h (24.3.5b).
02Which fire resistance classification indicates a cable that keeps working for 30 minutes in the BS EN 50200 test?
- APH120
- BCca
- CLSZH
- DPH30
Why: PH30 is a fire-resistance classification (BS EN 50200): the cable keeps working for 30 minutes under fire and mechanical shock. BS 5839-1 'standard' fire-resisting cable meets PH30 and 'enhanced' cable PH120. LSZH describes low smoke and halogen emission, and Cca is a reaction-to-fire class under the CPR.
03What voltage is typically used for fire alarm system power supply?
- A230V AC
- B48V DC
- C24V DC
- D12V DC
Why: 24V DC is the standard voltage for most fire alarm system power supplies and devices.
Common questions
Is the Power & Cabling 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.