DOCSLIB.ORG

Understanding Electrical Terms

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Understanding Electrical Terms Understanding Electrical Terms ® Understanding Electrical Terms In today’s computer-intensive work environments, a critical issue is clean, reliable power. Haworth is the industry leader in furniture-based power solutions. The ability to handle any power requirement is an important component in Haworth’s mission to completely satisfy customers’ needs. This booklet is designed to help you become familiar with electrical terms commonly used in the contract furniture industry. You’ll find descriptions of specific Haworth electrical products as well. Having a working knowledge of these terms and descrip- tions will help you understand Haworth’s furniture-based power capabilities. Remember, Haworth field sales engineers are also always ready and available to answer specific customer inquiries. Use this booklet to become conversant in the language of power, and as a companion to the other Haworth booklets on electrical topics: “Using the 6-Circuit Power Base,” “Complying with Electrical Standards,” and “Interfacing with Building Power.” Table of Contents Industry-Common Electrical Terms . 2-15 Access Flooring Floor Duct Power Zone Ampacity Floor Monument/Floor Access Receptacle Outlet Amperage, Ampere, Amp Ground Conductor Separate Neutral Balancing, Load Balancing Harmonic Currents, Harmonics Shared Neutral Ballast Hot Conductor Short Circuit Branch Circuit Inspector Surge Protector, Spike Protector Circuit Isolated Ground Terminal Circuit Breaker(s) Junction Box Three-Phase Power Clean Power Load 3+D Circuit Configuration Codes, Local Electrical Codes Load Balancing 2+2 Circuit Configuration Common Ground Maximum Continuous Load 6-Circuit Configuration Conductor National Electrical Code UL Listed, ULc, CSA, ETL Conduit Neutral Conductor Uninterruptible Power Supply (UPS) Connector, Terminal Ohm Voltage, Volts Continuous Load Open Circuit Voltage Fluctuation Dedicated Circuit Outlet Voltage Spike Designated Branch Circuit Plenum, Plenum-Rated Wattage, Watts Dirty Power Poke Through Wire Gauge Electrical Test Laboratories Polarized Plug, Grounded Plug, Electromagnetic Interference (EMI) 3-Prong Plug Flat Wiring Power Outage Haworth Electrical Product Terms . 16-24 Ambient Lighting Fixture Pivot-Head Task Lighting Raceway Retrofit Kit Base Feed Module Ported Panel Kit Street Light Beltline Panel Power & Communications Straight-Span Power Connector Concealed Base Feed Module Elements Task Lighting Fixture Docking Module Power Conditioning Receptacle The Power Base™ Electrical Cord and Receptacles (PCR) Top Feed Module Electronic Work Surface Power Distribution Assembly Vertical Wire Channel End Cap (PDA), Raceway Wire Basket Extended Power Connector Power Module, Smart Power Wire Management Loop Flexible Power Connector Module, Storage Module Work Surface Grommet Horizontal Wire Manager Power Receptacle Work-Surface-Height Duplex International Power Receptacle Powered Table System Receptacle Low Voltage Switching System Raceway Pass-Through Cord Raceway Trim Cover NOTE: Within each description, italicized type is used to denote terms that are described elsewhere in this booklet. 3 Industry-Common Electrical Terms Access Flooring A flooring system in which modular panels are raised above the floor slab, typically on 3”- to 12”-high supports. Electrical conduit and data cabling are routed beneath the flooring panels and connected to floor monuments (raised or flush). This type of flooring system can provide efficient access to wires and cables and can in some instances simplify reconfiguration. Ampacity Ampacity refers to the maximum current, in amperes, that a conductor can carry three hours or more without exceeding the temperature rating of the electrical insulation. Underwriters Laboratories (UL) determines the ampacity of furniture power systems through testing; ampacity is listed on the power system’s label. The National Electrical Code (NEC) does not calculate ampacity. Amperage, Ampere, Amp Amperage is the volume (or quantity) of electrical current flowing through a circuit. This volume is measured in amperes, otherwise referred to as amps. The amount of amps required by an electrical device to operate is usually listed on the equipment’s electrical nameplate. Circuit #1 Circuit #2 Circuit #3 Balancing, Load Balancing 14.5 AMPS 14.5 AMPS 14.5 AMPS A planning practice in which the total amper- age requirements of the electrical equipment in a shared-neutral installation is distributed equally among the number of available elec- trical circuits servicing the installation. For shared-neutral three-phase circuits, this refers to matching the current of circuits 1, 2, and 3 with respect to each other. Separate-neutral installations, such as those using Haworth’s Power Base, do not require balancing within each furniture cluster. Load Balancing in a Shared-Neutral Office Installation 4 Ballast A device in fluorescent lamps that regulates the level (amps) of electrical current and voltage flowing through the fluorescent lamp tube. Ballasts may be magnetic or electronic, with electronic being slightly more energy efficient. Branch Circuit A single circuit carrying electrical current (usually limited to 20 amps) to office fur- niture and equipment. It consists of conductors (wires) connected between the building’s electrical service panel (circuit breakers) and the electrical outlets (power receptacles). Circuit A complete path for electrical current flowing from the building power source to the equipment being powered and back to the power source. The “hot” conductor of a circuit carries 120-volt power to the equipment; the “neutral” conductor carries it back to the source. The “ground” Building Power Equipment conductor provides a safe escape Source route for power in the event of short circuits or other problems. Hot Conductor Circuits are rated according to the number of amps they can accom- Electrical Current Flow modate. The total number of amps Neutral Conductor required by all of the equipment in a Ground Conductor furniture installation will dictate the (Ground) Circuit number of circuits required. Circuit Breaker(s) A safety device designed to automatically stop the flow of electricity whenever a circuit becomes overloaded, i.e. exceeds the number of amps that the wiring can accommodate. Branch circuits usually have 20-amp breakers (15-amp breakers in Canada). The maximum continuous load on a circuit breaker is permitted to be 80% (16 amps) of the rating, which prevents unnecessary power interruptions caused by operation too close to 100% capacity. 5 Industry-Common Electrical Terms Clean Power Smooth Waveform Power which has a smooth waveform with no spikes, notches or other irregularities; clean power also has a voltage within a range 10% above or below the 60 Cycles Voltage or Current Voltage Per Second standard 120 volts. Computers and peripheral equip- ment operate most reliably with clean power, which Clean Power is free from electrical noise (spikes, drop-outs, surges, sags, etc.) and voltage varia- tions generated by operating equipment. Dedicated circuits and/or an isolated ground are often specified in order to obtain clean power for sensitive electronic equipment. (See Dirty Power.) Codes, Local Electrical Codes Various government bodies have adopted minimum safety standards, or “codes,” for the electrical wiring of furniture installations. The National Electrical Code (NEC) is the most widely recognized code, and it applies to most installations. Some municipalities, e.g. Chicago, New York, Miami, have their own codes. Since local codes are often more restrictive than the NEC, it’s always important to check their requirements as well. Common Ground An electrical circuit that uses a variety of conductors for a ground path. Ground conductors include wire, conduit, the metal of a building, or water pipes. Because so much of a building’s structure is grounded this way, a common ground is often elec- trically “noisy.” Therefore, an isolated ground is more suitable for computers. Conductor In branch circuits and in furniture-based power systems, the conductor is more than just wire. It includes the electrical conductors (power infeed, flexible power connec- tors, etc.), circuit breaker, and wire nuts. All elements in a conductor should be UL tested, listed, and labeled for safety. 6 Conduit Metal or non-metallic tubing — available in either rigid or flexible varieties — used to route and protect electrical wires and communication cables. Connector, Terminal Devices used to terminate or join two conductors. Connectors must be tested and labeled for safety. The amp rating of a power system is dictated by its connector or terminal ampacity, not the gauge of conductors within the system. Continuous Load See Maximum Continuous Load. Hot Conductor Dedicated Circuit A circuit with three conductors — Computer Computer consisting of hot, neutral, and ground — between the circuit breaker Neutral Conductor protecting the branch circuit and the Isolated Ground outlet that is dedicated only for use Dedicated Circuit with specific equipment. (Dedicated circuits are sometimes incorrectly Circuit #1 Hot Conductor referred to as isolated circuits.) Circuit #2 Hot Conductor Lights Lights Designated Branch Circuit Circuit #3 Hot Conductor A branch circuit with three conduc- Printer tors — consisting of hot, neutral, and Computer Computer ground — that is designated by the user for use with specific equipment. #1 Neutral Either the neutral and ground, or #2 Neutral both, may be shared with another #3 Neutral branch circuit. Ground Conductor
Load more

Recommended publications
  • Analysis of a Floating Vs. Grounded Output Associated Power Technologies
    To Float or Not to Float? Analysis of a floating vs. grounded output Associated Power Technologies Introduction In electrical circuits, voltage is always measured between two points: a point of high potential and a point of low or zero potential. The term “reference point” denotes the point of low potential because it is the point to which the voltage is referenced. An example of a voltage measurement is shown in Figure 1. Figure 1: Voltage measurement between line (high) and neutral (low) with the neutral tied to a ground reference point. The voltage at the low reference point is often referred to as a “ground” or “earth ground” because it is tied directly to the earth. Grounding electrical circuits is necessary for safety in the event that a fault occurs within the system. Without a good ground, there could be potential shock hazards on any piece of electronic equipment. Grounded systems can present their own set of problems. Small differences in potential within a grounding system can cause ground loops and these loops can have adverse effects ranging from data loss to presenting a severe safety hazard. As a result, it is beneficial to utilize a power source that gives the operator the flexibility of choosing either a grounded or floating output reference. This article will briefly outline the concept of grounding, discuss issues with grounding systems, and provide details about how Associated Power Technologies (APT) power sources can solve common issues with safety and grounding. Earth Ground and Chassis Ground Earth and Ground are perhaps the most misunderstood terms in electronics.
    [Show full text]
  • Conductors/Insulators Conductors & Insulators
    Conductors/InsulatorsConductors & Insulators 1 Conductors and insulators are all around us. Those pictured here are easy to identify. Can you describe why each is either a conductor or an insulator? 2 Photo B shows how air and distance can be good insulators. Why is air a good insulator? Why is distance a good insulator? 3 It’s not always easy to tell if something is a good conductor of electricity. Which of the items pictured are good conductors? Why? 4 Which of the items pictured are good insulators? Why? 5 Explain how the items pictured could create an electrical hazard to you. Never fly a kite near power lines. Visit tampaelectric.com/safety to learn more about electrical safety. Electromagnets 1 Electromagnets are used every day to perform large and small tasks. They make it possible for a crane to pick up large pieces of metal or a pad-mounted transformer to power your home. They can even make it possible for your doorbell to ring when you have a visitor. 2 The crane magnet, pad-mounted transformer and doorbell all contain a wire-wrapped electromagnet just like the one you created in class. However, a crane magnet and pad-mounted transformer use much more electricity. 3 Which one of the photographs shows an electromagnet? 4 Which one of the photographs does not show an electromagnet? 5 How could a pad-mounted transformer be dangerous to you? 6 If you see a pad-mounted transformer that has been damaged or its door is open, how is this dangerous and what should you do? Visit tampaelectric.com/safety to learn more about electrical safety.
    [Show full text]
  • Printer Tech Tips—Cause & Effects of Static Electricity in Paper
    Printer Tech Tips Cause & Effects of Static Electricity in Paper Problem The paper has developed a static electrical charge causing an abnormal sheet-to- sheet or sheet-to-material attraction which is difficult to separate. This condition may result in feeder trip-offs, print voids from surface contamination, ink offset, Sappi Printer Technical Service or poor sheet jog in the delivery. 877 SappiHelp (727 7443) Description Static electricity is defined as a non-moving, non-flowing electrical charge or in simple terms, electricity at rest. Static electricity becomes visible and dynamic during the brief moment it sparks a discharge and for that instant it’s no longer at rest. Lightning is the result of static discharge as is the shock you receive just before contacting a grounded object during unusually dry weather. Matter is composed of atoms, which in turn are composed of protons, neutrons, and electrons. The number of protons and neutrons, which make up the atoms nucleus, determine the type of material. Electrons orbit the nucleus and balance the electrical charge of the protons. When both negative and positive are equal, the charge of the balanced atom is neutral. If electrons are removed or added to this configuration, the overall charge becomes either negative or positive resulting in an unbalanced atom. Materials with high conductivity, such as steel, are called conductors and maintain neutrality because their electrons can move freely from atom to atom to balance any applied charges. Therefore, conductors can dissipate static when properly grounded. Non-conductive materials, or insulators such as plastic and wood, have the opposite property as their electrons can not move freely to maintain balance.
    [Show full text]
  • New Microsoft Excel Worksheet (2).Xlsx
    Knowledge Assessment ( Written Test) QP Name - Assistant electrician QP Code:CON/Q0602 Total marks: 210 marks Duration: 90 minutes Each NOS carries 30 marks Infrastructure: Classroom, Benches, Pens, pencils Marks CON/N0602: Select and use hand tools, power tools, and electrical devices relevant to construction electrical works 1 Which device is used to measure current in a circuit? 4 a. Voltmeter b. Ammeter c. Tester d. Megger 4 2 Identify the item form the image below? a. Wattmeter b. Digital Multi meter c. Energy meter d. Analog multi meter 3 Which device is used to avoid overload current in a circuit? 4 a. Residual current circuit breaker b. Miniature circuit breaker c. Earth Leakage circuit breaker d. Molded Case circuit breaker 4 Identify the tool form the image below? 4 a. Channel loch plier b. Combination plier c. Nose plier d. Snippers 5 Which of the following is an ideal instrument used to measure the thickness of conduit? 4 a. Vernier Caliper b. Multi meter c. Measuring tape d. Total station 6 Identify the item form the image below? 5 a. Semi enclosed or re-wire able fuse b. Cartridge type fuse c. D type fuse d. Link type fuse 7 Which of the following tools is used to strip the insulation of cable? 5 a. Plier b. Scissor c. Splicer d. Tester CON/N0603: Install temporary lighting arrangement at construction sites Marks 8 What is the maximum number of 1sq.mm wires that can be drawn through a 25mm diameter conduit 4 a. 5 b. 2 c. 4 d.
    [Show full text]
  • Lecture 9: More About Wires and Wire Models
    Lecture 9: More about wires and wire models Computer Systems Laboratory Stanford University [email protected] Copyright © 2007 Ron Ho, Mark Horowitz R Ho EE371 Lecture 9 Spring 2006-2007 1 Introduction • Readings • Today’s topics – Wires become more important with scaling • Smaller features mean faster devices but not faster wires. – Different kinds of wires have different scaled performance • Wires that scale in length • Wires that are fixed-length – How to deal with and estimate wire performance R Ho EE371 Lecture 9 Spring 2006-2007 2 A modern technology is mostly wires • Cross-section, Intel’s 65nm tech – 8 metal layers – Low-κr dielectrics (κr = 2.7) – Wires are 2x taller than wide • Wires are here • Transistors are here P. Bai, et al., “A 65nm logic technology featuring 35nm gate lengths, enhanced channel strain, 8 Cu interconnect…,” IEDM 2004. R Ho EE371 Lecture 9 Spring 2006-2007 3 Resistance, revisited… Resistance is resistivity/area, but… • Copper needs a diffusion barrier that reduces its cross-section – Also, barrier may not be evenly deposited • Copper can be overpolished – Can cause dishing (less thick) • Electrons can scatter off the edges – Happens more for thinner wires – Increases the base resistivity t w P. Kapur, “Technology and reliability constrained future copper interconnects: Resistance modeling,” IEEE Trans. Electron Devices, April 2002. R Ho EE371 Lecture 9 Spring 2006-2007 4 Capacitance, revisited… Model capacitance by four plates, each κ(A/d) • Plus a near-constant fringe term 0.1fF/um (fringe scales slowly) • Relative dielectrics differ, with low-κ within a layer – SiOF (3.5) or SiOC (2.5) – Reduces (dominant) sidewall cap – Wires are taller than they are wide κr2 •No low-κ between wire layers κr1 κr1 – For material strength κr2 s ILD A “sandwich” model R.
    [Show full text]
  • 2020 National Electrical Code® Style Manual
    2020 NATIONAL ELECTRICAL CODE® STYLE MANUAL 1 FOREWORD August 2020 The National Electrical Code® is used nationally and internationally as the basis for safeguarding persons, buildings, and their contents from hazards arising from the use of electricity. It is vitally important that the text be as explicit as possible, and that maximum consistency be achieved in the language used in the text. The Code contains those provisions considered necessary for safety and thus is widely used as a basis for legal enforcement in the installation of electrical conductors and equipment in buildings and certain other premises (as detailed in the Code itself); this places a major responsibility on those involved in the preparation of document text to use forms of expression that promote uniform interpretation. The National Electrical Code Correlating Committee has recognized these responsibilities and has issued this manual. Preparation and Date of Adoption. This manual was originally prepared by the Editorial Task Group of the National Electrical Code Committee and adopted by the National Electrical Code Correlating Committee on May 13, 1969. It was amended September 22, 1975, October 11, 1984, October 12, 1989, and May 9, 1994. In January 1999, the Correlating Committee Task Group on the Usability of the NEC rewrote the manual. It was adopted by the National Electrical Code Correlating Committee on March 19, 1999 and by the Standards Council on April 15, 1999. It was amended March 1, 2001, January 15, 2003, and August 9, 2011, August 2015, and December 2020. 2 TABLE OF CONTENTS Foreword ........................................................................................................ 2 Chapter 1 General 4 1.1 Purpose ............................................................................................
    [Show full text]
  • W-Series Junction Boxes
    208-209.qxp 7/22/2010 2:58 PM Page 209 W-Series Junction Boxes Application and Selection Applications: Considerations for Options and Accessories: Junction boxes, designed for hazardous Selection: A wide variety of options and accessories and non-hazardous locations, are used in a • Environmental location – the physical for special application are available for the variety of industries to perform the location of the junction box will call for various junction box families. These can following functions: proper construction of the box to meet be selected once the type of junction box has been determined. These options are W-Series • As a pull box National Electrical Code requirements and will affect the material and finish shown on the individual pages. Some of Boxes • To provide enclosures for splices and needed to meet weather and corrosive the options available include: taps conditions, if present. • Special covers • As a mounting box for multi-device • Number and size of conductors – • Hinged covers control stations combined with the function to be performed (i.e., splicing, pull box), • Materials and finishes • For housing apparatus, instruments, and determines the amount of space other devices needed, and therefore, the required • Equipment mounting plates physical dimensions of the box. • Conduit or device openings • Conduit layout – determines the number, • Corro-free™ epoxy powder coat – size, and location of the conduit information available on request openings in the box. It will also determine the type of mounting required (i.e., flush or surface positioning of the box). • Flexibility required – if changes in the electrical system are anticipated, the box chosen should be easily adaptable, either by construction or size to the future system.
    [Show full text]
  • Commercial and Industrial Wiring. INSTITUTION Mid-America Vocational Curriculum Consortium, Stillwater, Okla
    DOCUMENT RESUME ED 319 912 CE 054 850 AUTHOR Kaltwasser, Stan; Flowers, Gary TITLE Commercial and Industrial Wiring. INSTITUTION Mid-America Vocational Curriculum Consortium, Stillwater, Okla. PUB DATE 88 NOTE 710p.; For related documents, see CE 054 849 and CE 055 217. Printed on colored paper. AVAILABLE FROM Mid-America Vocational Curriculum Consortium, 1500 West Seventh Avenue, Stillwater, OK 74074 (order no. 801401: $19.00). PUB TYPE Guides - Classroom Use Guides (For Teachers)(052) EDRS PRICE MF04 Plus Postage. PC Not Available from EDRS. DESCRIPTORS Classroom Techniques; Construction (Process); Course Content; Curriculum Guides; Electrical Occupations; Electrical Systems; *Electric Circuits; *Electricity; *Entry Workers; *Job Skills; *Learning Activities; Learning Modules; Lesson Plans; Postsecondary Education; Secondary Education; Skill Development; Teaching Methods; Test Items; Units of Study IDENTIFIERS *Electrical Wiring ABSTRACT This module is the third in a series of three wiring publications, includes additional technical knowledge and applications required for job entry in the commercial and industrial wiring trade. The module contains 15 instructional units that cover the following topics: blueprint reading and load calculations; tools and equipment; service; transformers; rough-in; lighting; motors and controllers; electrical diagrams and symbols; two and three wire controls; separate control circuits; sequence control circuits; jogging controls; reversing starters; special control circuits; and programmable controls. A special supplement of practice situations is also provided. Each instructional unit follows a standard format that includes some or all of these eight basic components: performance objectives, suggested activities or teachers and students, information sheets, assignment sheets, job sheets, visual aids, tests, and answers to tests and assignment sheets. All of the unit components focus on measurable and observable learning outcomes and are designed for use for more than one lesson or class period.
    [Show full text]
  • Connecting to the Grid – Alberta's New Micro-Generation Regulations
    Connecting to the Grid – Alberta’s New Micro-Generation Regulations Solar Energy Society of Canada – Northern Alberta Chapter MacEwan College 2009 April 21 www.macewan.ca www.solaralberta.ca Gordon Howell, P.Eng. E-mail: [email protected] (download this presentation from www.hme.ca/presentations) Solar Energy Development Specialists 1 Alberta’s Micro-Generation Regulations 5.6 kW solar PV system Riverdale NetZero energy house Edmonton z What does this mean to us? www.riverdalenetzero.ca Connected to EPCOR D&T z How do we use the regulations? z Who can use the regulations? z Are the regulations as easy as they sound? z Will they allow us to generate all our own electricity? z What price will we get paid for our electricity? z Can we make money at it? 8.4 kW solar PV system Laebon Homes net zero energy house z What will our electricity bill look like? Red Deer www.laebon.com Connected to Red Deer Electric Light and Power z What do you do if your electricity delivery company says “no”? 8.4 kW solar PV system Avalon Central Alberta net zero energy house Red Deer Solar Energywww.avaloncentralalberta.com Development Specialists 2 Connected to Red Deer Electric Light and Power Intro: The Prime Focus of this Presentation Prime Focus Not Covered z House-sized micropower systems z Business-sized micropower systems z Inverter-based micropower systems z Synchronous or induction generators using solar or microwind z Systems grid-connected to EPCOR z Systems grid-connected to other and FortisAlberta in the Edmonton electricity deliver companies not in the area Edmonton area z Regulatory paperwork process for z How micropower systems work, getting your micropower system how to design or size them, approved how to find suppliers, what are the costs and economics (these subjects are covered in other presentations) You must skate to where the puck is going 3 …not to where it is now.Solar Energy Development Specialists Wayne Gretzky Three points to take away… 1.
    [Show full text]
  • Electrical Inspection Checklist for One-Family Homes Based on the 2020 National Electrical Code® (NEC®)
    Electrical Inspection Checklist for One-Family Homes Based on the 2020 National Electrical Code® (NEC®) NOTE: The Board of Electricity adopted the 2020 National Electrical Code (NEC) with an effective date of Nov. 17, 2020. Accordingly, the Department of Labor and Industry began enforcing the 2020 NEC on Nov.17, 2020. Electrical work authorized by permits issued on or after this date must comply with the 2020 NEC. Electrical license examinations are based on the requirements of the 2020 NEC beginning Jan. 1, 2021. However, due to concerns regarding the availability of 2-pole GFCI circuit breakers, the department delayed enforcement of the requirements for 250-volt GFCI receptacles and outlet requirements found in NEC 210.8(A) and 210.8(F). On April 5, 2021, DLI will begin enforcing the 250-volt GFCI receptacle and outlet requirements found in NEC 210.8(A) and 210.8(F). Industry circuit breaker manufacturers have confirmed that supply-chain challenges will be resolved in March 2021. Electrical work authorized by permits issued on or after April 5, 2021, must comply with the 2020 NEC. 001 An owner (i.e. homeowner) who files a Request for Electrical Inspection form (i.e. permit) with the Department of Labor and Industry or other electrical inspection authority is signing an affidavit and declaring they own and occupy the residence and they will personally perform all of the electrical work, including the planning and laying out of the electrical work. 002 The term “owner” is defined in law as a natural person who physically performs electrical work on premises the person owns and actually occupies as a residence or owns and will occupy as a residence upon completion of construction.
    [Show full text]
  • Guideline on Through Penetration Firestopping
    GUIDELINE ON THROUGH-PENETRATION FIRESTOPPING SECOND EDITION – AUGUST 2007 SHEET METAL AND AIR CONDITIONING CONTRACTORS’ NATIONAL ASSOCIATION, INC. 4201 Lafayette Center Drive Chantilly, VA 20151-1209 www.smacna.org GUIDELINE ON THROUGH-PENETRATION FIRESTOPPING Copyright © SMACNA 2007 All Rights Reserved by SHEET METAL AND AIR CONDITIONING CONTRACTORS’ NATIONAL ASSOCIATION, INC. 4201 Lafayette Center Drive Chantilly, VA 20151-1209 Printed in the U.S.A. FIRST EDITION – NOVEMBER 1996 SECOND EDITION – AUGUST 2007 Except as allowed in the Notice to Users and in certain licensing contracts, no part of this book may be reproduced, stored in a retrievable system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the publisher. FOREWORD This technical guide was prepared in response to increasing concerns over the requirements for through-penetration firestopping as mandated by codes, specified by system designers, and required by code officials and/or other authorities having jurisdiction. The language in the model codes, the definitions used, and the expectations of local code authorities varies widely among the model codes and has caused confusion in the building construction industry. Contractors are often forced to bear the brunt of inadequate or confusing specifications, misunderstandings of code requirements, and lack of adequate plan review prior to construction. This guide contains descriptions, illustrations, definitions, recommendations on industry practices, designations of responsibility, references to other documents and guidance on plan and specification requirements. It is intended to be a generic educational tool for use by all parties to the construction process. Firestopping Guideline • Second Edition iii FIRE AND SMOKE CONTROL COMMITTEE Phillip E.
    [Show full text]
  • Electricity Production by Fuel
    EN27 Electricity production by fuel Key message Fossil fuels and nuclear energy continue to dominate the fuel mix for electricity production despite their risk of environmental impact. This impact was reduced during the 1990s with relatively clean natural gas becoming the main choice of fuel for new plants, at the expense of oil, in particular. Production from coal and lignite has increased slightly in recent years but its share of electricity produced has been constant since 2000 as overall production increases. The steep increase in overall electricity production has also counteracted some of the environmental benefits from fuel switching. Rationale The trend in electricity production by fuel provides a broad indication of the impacts associated with electricity production. The type and extent of the related environmental pressures depends upon the type and amount of fuels used for electricity generation as well as the use of abatement technologies. Fig. 1: Gross electricity production by fuel, EU-25 5,000 4,500 4,000 Other fuels 3,500 Renewables 1.4% 3,000 13.7% Nuclear 2,500 TWh Natural and derived 31.0% gas 2,000 Coal and lignite 1,500 19.9% Oil 1,000 29.5% 500 4.5% 0 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2010 2020 2030 Data Source: Eurostat (Historic data), Primes Energy Model (European Commission 2006) for projections. Note: Data shown are for gross electricity production and include electricity production from both public and auto-producers. Renewables includes electricity produced from hydro (excluding pumping), biomass, municipal waste, geothermal, wind and solar PV.
    [Show full text]