CDCP Fire Protection and Safety 4 — Questions and Answers
Question 1: Which fire suppression agent is classified as a clean agent and leaves no residue, making it ideal for protecting sensitive data centre equipment?
- Carbon dioxide (CO2)
- FM-200 (HFC-227ea) (Correct answer)
- Dry chemical powder
- Foam
Correct answer: FM-200 (HFC-227ea)
FM-200 (HFC-227ea) is a clean agent that suppresses fire without leaving residue, making it safe for electronic equipment.
Question 2: What is the primary purpose of a pre-action fire suppression system in a data centre?
- To release suppression agent immediately upon heat detection
- To require two separate events before water is released, preventing accidental discharge (Correct answer)
- To suppress fires using foam rather than water
- To activate sprinklers when smoke concentration reaches 5% per foot
Correct answer: To require two separate events before water is released, preventing accidental discharge
Pre-action systems require two independent triggering events (e.g., smoke detection plus heat detection) before releasing water, preventing accidental discharge onto equipment.
Question 3: Under NFPA 75, what is the maximum allowable fire compartment size for IT equipment rooms protected by automatic sprinklers?
- 2,500 square feet
- 5,000 square feet
- 52,000 square feet (Correct answer)
- No limit when sprinklers are installed
Correct answer: 52,000 square feet
NFPA 75 allows IT equipment rooms up to 52,000 square feet when protected by automatic sprinkler systems.
Question 4: A data centre experiences a fire alarm activation. Staff verify it is a real fire in a raised-floor void. Which action should be taken FIRST?
- Cut power to the entire facility
- Evacuate personnel and activate the suppression system per the emergency plan (Correct answer)
- Open the raised floor tiles to manually extinguish the fire
- Call the equipment manufacturer for guidance
Correct answer: Evacuate personnel and activate the suppression system per the emergency plan
Immediate evacuation and activating suppression per the emergency response plan is the correct first action during a confirmed fire event.
Question 5: What fire detection technology is most effective at detecting slow, smoldering fires in early stages within a data centre?
- Rate-of-rise heat detectors
- Fixed-temperature heat detectors
- Very Early Smoke Detection Apparatus (VESDA) (Correct answer)
- Optical beam smoke detectors
Correct answer: Very Early Smoke Detection Apparatus (VESDA)
VESDA (Very Early Smoke Detection Apparatus) uses aspirating sampling to detect extremely low concentrations of smoke, identifying smoldering fires long before conventional detectors.
Question 6: In a data centre, which cable type significantly increases fire risk due to its halogenated materials releasing toxic gases when burned?
- Plenum-rated cables
- PVC-jacketed cables (Correct answer)
- Low-smoke zero-halogen (LSZH) cables
- Fiber optic cables
Correct answer: PVC-jacketed cables
PVC-jacketed cables release toxic halogenated gases (HCl) when burned, increasing danger to personnel and equipment during a fire.
Question 7: What is a 'holddown' or 'abort' switch in the context of a gaseous fire suppression system?
- A switch that manually triggers the suppression discharge
- A switch that prevents automatic suppression discharge during the pre-discharge delay period (Correct answer)
- A valve that isolates sections of the suppression piping
- A manual pull station for triggering alarms
Correct answer: A switch that prevents automatic suppression discharge during the pre-discharge delay period
An abort switch allows personnel to temporarily delay an automatic suppression discharge during the pre-discharge countdown to prevent accidental release.
CDCP Fire Protection and Safety 4
Which fire suppression agent is classified as a clean agent and leaves no residue, making it ideal for protecting sensitive data centre equipment?