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Fujitsu C120-H007-06EN CHAPTER 5 Electromagnetic Environment and Static Electricity

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C120-H007-05EN 59

CHAPTER 5 Electromagnetic Environment and Static Electricity

This chapter explains the electromagnetic environment conditions and electrostatic

effects relevant to server systems.

5.1 Magnetic Fields

CRT displays could be influenced by the magnetic fields generated by nearby power

transformers, electric wires carrying large current, or any magnetized metallic objects.

5.1.1 Allowable magnetic field intensities of displays

CRT displays vary in allowable magnetic field intensity depending on the size of the

CRT, resolution, etc.

Typical values are:

zAllowable AC magnetic field intensity: About 1 μΤ

zAllowable DC magnetic field intensity: About 50 μΤ to 60 μΤ

Contents

Main Page FOR SAFE OPERATION Handling of This Manual ABOUT THIS PRODUCT RADIO FREQUENCY INTERFERENCE STATEMENT The following notice is for EU users only. The following notice is for USA users only. Page Revision History (1/1) Page Preface Contents and Organization of This Manual CHAPTER 1 Installation Planning Overview CHAPTER 2 Installation Sites CHAPTER 3 Equipment Layout Page Other Reference Manuals For the readers Page Contents Preface Page CHAPTER 5 Electromagnetic Environment and Static Electricity. . . . . . . . . 59 Acronyms & Abbreviations Index Figures Page Tab le s Page CHAPTER 1 Installation Planning Overview 1.1 Office Installation and Computer Room Installation 1.1.1 Office installation (1) Equipment suitable for office installation 1.1.2 Computer room installation 1.2 Computer Room Installation Planning 1.3 Preparing Building and Facilities 1.3.1 Building and facilities needed to install a server system 1.3.2 Furnishings accompanying a server system 1.3.3 Rooms needed to run the server system 1.4 Scheduling Page CHAPTER 2 Installation Sites 2.1 Building Location 2.1.1 Sites convenient for systems development and administration 2.1.2 Utility services 2.1.3 Secure sites 2.2 Buildings 2.2.1 Building structures (1) Floor strength (2) Vibration and earthquake-proofing (3) Water damage (4) Fires (5) Disasters caused by human neglect Page 2.2.4 Facilities (1) Power supply facilities (2) Air conditioning facilities (3) Telecommunications equipment (4) Fire extinguishing facilities 2.2.5 Access routes (1) Building delivery entrance (2) Computer room entrance and building passages (3) Withstand load and protection of the access route 2.2.6 Water and fuel stocks 2.3 Computer Room Structure 2.3.1 Computer room structural requirements (1) Base floor strength (2) Dustproof finishing (3) Free-access floor construction (4) Ceiling height 2.3.2 Free-access flooring (1) Raised floor height (2) Strength and surface material of free-access floor panels (3) Opening for server-system-use (4) Installation of a floor panel for a building air conditioner (5) Slopes and stairways (6) Base floor and free-access floor cleaning 2.3.3 Interiors (1) Heat insulation (2) Prevention of entry of outside air (3) Shielding from direct sunlight (4) Sound absorption and insulation (5) Lighting (6) Maintenance outlets (7) Dust CHAPTER 3 Equipment Layout 3.1 Proposed Computer Room Top View (1) Top view (2) Scale 3.2 Equipment Templates 3.3 Precautions in Preparation of an Equipment Layout (2) Concentration of small equipment (3) Entrance and passage (4) Maintainability (5) Acoustic noise (6) Furniture and fixtures (7) Handling of vents 3.4 Air Conditioners 3.4.1 Air conditioning units 3.4.2 Air conditioning piping 3.4.3 Heat distribution 3.4.4 Air circulation 3.5 Power Supply Facilities 3.5.1 Power supply facilities for server system 3.5.2 Power supply facilities for air conditioners 3.5.3 Facility control panels Table 3.1 Kinds, uses, and locations of power supply facilities (2/2) 3.6 Line and Signal Wiring Facilities CHAPTER 4 Air Conditioning 4.1 Characteristics of Computer Room Air Conditioning 4.1.1 Constant temperatures and humidities 4.1.2 Air conditioning conditions and capacities 4.1.3 Service time and reliability 4.2 Styles of Air Conditioner 4.2.1 Direct blowing 4.2.2 Duct blowing 4.2.3 Underfloor ventilation 4.2.4 Combined use of direct or duct blowing and underfloor ventilation 4.3 Air Conditioning Conditions 4.3.1 Permissible temperature and humidity ranges for server systems 4.3.2 Recommended temperatures and humidities for computer rooms 4.3.3 Temperature and humidity recommendations for computer rooms (1) Changing the room temperature Figure 4.5 Psychrometric chart applicable to changing the room temperature Table 4.2 Temperature and humidity recommendations (changing the room temperature) (2) Lowering the underfloor temperature 4.3.4 Dust (1) Airborne dust (2) Removing dust 4.3.5 Corrosive gases 4.3.6 Seawater (salt damage) 4.4 Thermal Load and Cooling Capacities 4.4.1 Thermal load imposed on air conditioner 4.4.2 Example of cooling capacity calculations for room air conditioning Page Table 4.6 Examples of typical air conditioner cooling capacity calculations (2/2) 4.4.3 Underfloor ventilation air conditioning 4.4.4 Convenient formulas for air conditioning capacities Table 4.8 Convenient formulas for air conditioner capacity Table 4.7 Examples of underfloor-ventilation air conditioner cooling capacity calculations (2/2) Page 4.5 Precautions Pertaining to the Installation of Air Conditioners 4.5.1 Humidifier (1) Why a humidifier is needed? (2) Types of humidifiers and replacement water Page Page 4.5.5 Preventing dew condensation in underfloor ventilation (1) If the room temperature is low 1 2 3 4 (2) If the room air is at a high temperature and a high humidity Page Page Page CHAPTER 5 Electromagnetic Environment and Static Electricity 5.1 Magnetic Fields 5.1.1 Allowable magnetic field intensities of displays 5.1.2 Sources of magnetic fields and fault symptoms 5.1.3 Magnetic field control (1) Separating the display (2) Changing the display type (3) Magnetic shielding 5.2 Electric Fields 5.2.1 Allowable electric field intensities for server systems 5.2.2 Conditions for using mobile phones 5.3 Static Electricity 5.3.1 Recommended electrostatic voltage for a computer room 5.3.2 Electrostatic control in the computer room Page CHAPTER 6 Power Supply Facilities 6.1 Input Power Requirements 6.1.1 Input power requirements 6.1.2 Calculating the power required 6.1.3 Calculating the rush current 6.2 Power Supply Facilities 6.2.1 Kinds and uses of power supply facilities (1) Reduction in leakage current (2) Freedom from power failures 6.2.2 Selecting power supply facilities (1) Systems that cannot tolerate service disruption (2) Systems that can tolerate a service disruption Page 6.3 UPS Requirements (1) UPS load specifications (2) Prediction of rush current and load variation of the equipment (3) UPS terminating requirements (4) Effect of high-frequency noise (5) Life-span of a UPS built-in battery (6) Discharge of UPS built in battery (7) Requirements for power interruption (8) Leakage current (9) Load rating (10)Power rating (for printer connection) (11)Checking the UPS environmental specifications and the warranty term 6.4 Grounding 6.4.1 Grounding equipment in the computer room (1) Grounding in the buildings in conformance with the Grounding Typ e: (2) Grounding in the buildings conforming with the IEC standards. 6.4.2 Grounding other equipment 6.4.3 Grounding LAN devices (1) Grounding LAN devices (2) Separation of the LAN transmission line signal ground from the connected devices (3) Typical modes of LAN connection and grounding 6.4.4 Grounding-plate method Page 6.5 Distribution Panels Page (2) Distribution panel front plate (3) Connected device marking (4) Output terminal boards requirements Page 6.6 Distribution Lines Page 6.8 Distribution Line Insulation Testing 6.8.1 Test voltage 6.8.2 Phase and grounding cable insulation test 6.8.3 Interphase insulation testing (1) Interphase insulation test within the distribution panel Page CHAPTER 7 Protection Against Lightning 7.1 Protection of AC Line (1) Using power control box (F9710PW2) Page 7.2 Protection of Signal Lines (1) External modem is in use (2) LAN connection CHAPTER 8 Security Actions 8.1 Basic Concepts 8.1.1 Levels of security 8.1.2 Objects of security 8.1.3 Kinds of disasters 8.2 Details 8.2.1 Fire (1) Automatic fire alarms (2) Kinds of fire extinguishing agents (3) Fire extinguishers and fire extinguishing equipment (4) Escape facilities (5) Other considerations for fire prevention 8.2.2 Earthquakes 8.2.3 Water damage (1) Asphalt waterproofing (2) Window structures Page 8.2.4 Burglary (1) Environmental maintenance (2) Access management (3) Occupant identification (4) Monitor cameras (5) Automatic burglar alarms (6) Other considerations for burglary prevention 8.2.5 Rat damage Page Appendix A Conversion Information zUnits of Measure Conversion zFraction to Decimal Equivalence A.1 Units of Measure Conversion Table A.1 Units-of-measure conversion A.2 Fraction to Decimal Equivalence Acronyms & Abbreviations Page Index A B C D F G H I K R S T U V Page Readers Comment Form BUSINESS REPLY MAIL