N surge suppressors should protect all equipment and

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n Surge suppressors should protect all equipment and critical components require UPS. Humidity n The ideal Operating Range is between 40 to 60 percent. n High humidity above 60% can cause condensation on parts. Also can cause corrosion of components n Silver plating goes to copper circuits impeding the electrical efficiency n Low humidity less than 40% increase static electricity n A static charge of 4,000 volts is possible under normal humidity on a hard wood floor n Charges up to 20,000 volts or more are possible under very low humidity with non-static free carpeting
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Static Charge Volts Damage 40 Sensitive circuits 1,000 Scramble monitor display 1,500 Disk drive data loss 2,000 System shutdown 4,000 Printer jam 17,000 Permanent chip damage Control to prevent Static Electricity n Anti-static sprays where possible n Anti static flooring n Proper grounding n Anti-static tables n HVAC should maintain proper humidity levels Fire Detection and Suppression Three elements to sustain fire: n Oxygen n Heat - temperature n Fuel Class Description Suppression Medium A Common combustibles Water or soda acid B Liquid CO2, soda acid, Halon C Electrical CO2 or Halon D Combustible metals Dry powder n Water – suppresses temperature required to sustain fire n Soda Acid – suppressed the fuel n CO2 – Suppresses the oxygen n Halon – suppresses through chemical reaction that kills the fire Fire Detectors n Heat sensing – detects one of two things: n Temperature reaches specified level (less false positives) n Temperature rises quickly n Flame Actuated – fairly expensive n Sense infrared energy of flame or pulsation of the flame n Smoke Actuated – two types n Photoelectric devices triggered by variation in light hitting photoelectric cells n Radioactive device goes off when ionization current is created by radioactive reaction to smoke Fire Extinguishing Systems Wet Pipe n Sprinkler always contain water n At 165 ° F - fusible link in nozzle melts n Most reliable n Subject to leaking and freezing Dry Pipe n No water standing in the pipe n Air is blown out and water is released
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n Time delay can allow systems to power down Deluge n Dry pipe system n Large Volume of Water n Not good for computer equipment Preaction n Most recommended for computer room n Combines wet and dry n Charges pipe when heat is detected n Releases water when - fusible link in nozzle melts Gas Discharge Pressurized inert gas released through raised floor n Carbon Dioxide CO2 n Halon 1211 – does not require sophisticated pressurization n Halon 1301 - requires sophisticated pressurization n FM –200 is now most common Halon replacement Carbon Dioxide CO2 n Colorless and odorless gas n Removes oxygen and can be lethal if all oxygen is removed n Used in unmanned facilities n If used in manned system alarm must allow adequate time to evacuate or cancel Portable Extinguishers should be located: n Commonly located exits n Clearly marked with their fire types n Checked regularly Halon – at one time was considered perfect suppression medium n
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