Domain 3: Environmental Controls Flashcards
Proper level of humidity in a data center can do what?
Mitigate static by grounding all circuits in a proper manner
High humidity levels in a data center can do what?
Can cause corrosion (condensed water in the air gets into the equipment)
Alerts when temperature exceeds an established safe baseline
Heat Detectors
- Smoke detector
- Contain a small radioactive source that creates a smoke electric charge
- When smoke interrupts the electric charge an alarm will trigger
Ionization-based smoke detectors
- Smoke detector
- Contain an LED and photoelectric sensor that generates a small charge while receiving light
- When smoke interrupts the electric charge an alarm will trigger
Photoelectric sensors
- Detects infrared or ultraviolet light emitted in fire
- Sensor must align with fire
Flame Detector
Individual that ensures all personnel safely evacuates the building in the event of an emergency or drill
Safety warden
Individual that ensures that all personnel are accounted for at the emergency meeting point
Meeting Point Leader
- Provides immediate alerts in the event of emergencies i.e. severe weather, threat of violence etc.
Duress Warning systems
- Type of fire
- Combustibles: wood and paper
- Extinguished by: water or soda acid
Class A Fires
- Type of fire
- Combustibles: burning alcohol, oil, and gasoline
- Extinguished by: gas (Halon/Halon substitute, CO2) or soda acid
Class B Fires
- Type of fire
- Combustibles: Electrical fires
- Extinguished by: gas (Halon/Halon substitute, CO2)
Class C Fires (Class E in UK)
- Type of fire
- Combustibles: burning metals
- Extinguished by: dry powder
Class D Fires
- Type of fire
- Combustibles: kitchen fires i.e. burning oil or grease
- Extinguished by: wet chemicals
Class K Fires (Class F in UK)
- Fire suppressant
- Lowers temperature of fire
- Safest of all suppressive agents
Water
- Fire suppressant
- Mixture of Sodium Bicarbonate and water
- Creates a foam that can cut off the oxygen supply
Soda Acid
- Fire suppressant
- Usually sodium chloride
- Smothers a fire
- Used to extinguish metal fires
Dry Powder
- Fire suppressant
- Chemical is usually potassium acetate mixed with water
- Used to extinguish kitchen fires
Wet Chemicals
- Fire suppressant
- Odorless and colorless removes oxygen in the air
- Dangerous and only recommended for unstaffed areas i.e. electrical substations
CO2
- Fire suppressant
- Chemical reaction that consumes energy and lowers temperature of fire
- Has ozone depleting properties and is being phase out
Halon
- Sprinkler System
- Contains a small glass bulb (or metal order versions) designed to melt or break at a specific temperature
- Causing the sprinkler head to open and water to flow.
- Pipes are always filled with water
Wet Pipes
- Sprinkler System
- Valve holds the water back and will remain closed as long as sufficient air pressure remains in the pipes.
- Pipes filled with compress air
Dry Pipe
- Sprinkler System
- Sprinkler heads are open and larger than dry pipe heads
Deluge
- Sprinkler System
- Combination of different sprinkler systems and requires two separate triggers to release water
Preaction
