Answer the Purpose: 4
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Best Practice Guide to Cable Ladder and Cable Tray Systems
Best Practice Guide to Cable Ladder and Cable Tray Systems Channel Support Systems and other Associated Supports November 2012 BEAMA Best Practice Guide to Cable Ladder and Cable Tray Systems Including Channel Support Systems and other Associated Supports Companies involved in the preparation of this Guide Contents INTRODUCTION 5 DEFINITIONS AND ABBREVIATIONS 6 1. Packing Handling and Storage 8 1.1 General Packing and Handling 8 1.2 Loading and offloading recommendations 9 1.3 Storage 11 2A. Installation of the system 12 2.1 Common tools for Installation 12 2.2 Structural characteristics 12 2.3 Support Systems 18 2.4 Straight cable ladder and cable tray lengths 29 2.5 Coupler types (refer to manufacturer’s literature) 32 2.6 Fixings 36 2.7 Fittings 36 2.8 Accessories 39 2.9 Site modification 39 2.10 Earth protection and EMC 40 2B. Installation of Cable 41 2.11 Preparation 41 2.12 Wiring Regulations 41 2.13 Power Cables 41 2.14 Data Cables 46 2.15 Expansion 46 2.16 Electro Mechanical Effects 46 3. Environment 48 3.1 Selecting the right material and finish 48 3.2 Finishes 56 3.3 Non-Metallic systems 61 3.4 Loadings 63 3.5 Temperature 65 4. Health & Safety 67 5. Maintenance 68 5.1 Inspection 68 5.2 Removal of cables 68 5.3 On site repairs 68 6. Sustainability 69 6.1 Sustainable development 69 6.2 REACH regulations 69 6.3 The management of WEEE and RoHS 69 6.4 Environmental footprint 70 7. Applicable Standards 71 Companies involved in the preparation of this Guide 72 FIGURES Figure 1: Methods of removal 9 Figure 2: Loaded beams 13 Figure -
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. -
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. -
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. -
Guidance Notes on Recommended Specifications of Junction Box and Cable Tray for Offshore Application
Guidance Notes on Recommended Specifications of Junction Box and Cable Tray for Offshore Application GUIDANCE NOTES ON RECOMMENDED SPECIFICATIONS OF JUNCTION BOX AND CABLE TRAY FOR OFFSHORE APPLICATION FEBRUARY 2018 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2018 American Bureau of Shipping. All rights reserved. ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword These Guidance Notes provide ABS recommendations for the design and construction of cable trays and junction boxes. These Guidance Notes are applicable to fixed and floating offshore structures as well as drilling units. These Guidance Notes provide recommendations and best practices for standard specifications of certain electrical and instrumentation components thus improving cost efficiency (i.e., design man-hours, operation and maintenance costs), and increasing predictability of operation without compromising quality and safety in offshore structures and units. The recommendations in these Guidance Notes are based on industrial experiences, project experience, shipyard practices, manufacturer’s data sheets, national regulations, international standards, and ABS Rules. These Guidance Notes become effective on the first day of the month of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of these Guidance Notes is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to [email protected]. Terms of Use The information presented herein is intended solely to assist the reader in the methodologies and/or techniques discussed. These Guidance Notes do not and cannot replace the analysis and/or advice of a qualified professional. -
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. -
Electrical – Wiring Methods, Components and Equipment for General Use
Electrical – Wiring Methods, Components and Equipment for General Use Approved for Public Release; Further Dissemination Unlimited At the completion of this unit you shall be able to: 1. Utilize section Z of the Safety and Health Hazard Inspection Program Checklist to identify compliant and non-compliant safety behaviors. 2. Identify areas of concern requiring immediate action to mitigate or prevent a possible injury. Please use “Slide Show” to properly view this presentation! • Let’s start with a discussion of Electrical Safety. Whenever you work with electrical devices there is a risk of electrical hazards, especially electrical shock. Risks are increased at maintenance and construction sites because many jobs involve electric power tools. Coming in contact with an electrical voltage can cause current to flow through the body, resulting in electrical shock and burns. Serious injury or even death may occur. Electricity has long been recognized as a serious workplace hazard, exposing employees to electric shock, electrocution, burns, fires, and explosions. In 1999, for example, 278 workers died from electrocutions at work, accounting for almost 5 percent of all on-the-job fatalities that year, according to the Bureau of Labor Statistics. What makes these statistics more tragic is that most of these fatalities could have been easily avoided. • When an electrical shock enters the body it may produce different types of injuries. Electrocution results in internal and external injury to body parts or the entire body – often resulting in death. After receiving a “jolt” of electricity all or part of the body may be temporarily paralyzed and this may cause loss of grip or stability. -
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. -
Commercial Conduit Rules and Regulations
Exhibit C – Commercial Conduit Rules and Regulations Electric Engineering Division COMMERCIAL CONDUIT RULES AND REGULATIONS S:\COO_ACM_US_Electric_Telecommunications\COO_ET_Engineering\Conduit Policies C-1 Exhibit C – Commercial Conduit Rules and Regulations 1805 NE 30th Ave., Bldg. 400 Ocala, FL 34470-4875 Phone: (352) 351-6620 Fax: (352 ) 401-6961 Electric Engineering Division Dear Developer: Over the next few months, the City of Ocala Utility Services (OUS) will be working closely with you and your contractors to install the electrical conduit system for your project. We in the Electric Engineering Division are looking forward to working with your contractors and want the installation to proceed as smooth as possible. Attached, please find the OUS Commercial Conduit Rules and Regulations for use by your electrical conduit contractor. If the contractor has any questions that are not addressed in this guide, please contact the OUS representative responsible for the project. Respectfully Ocala Utility Services Engineering Division C-2 Exhibit C – Commercial Conduit Rules and Regulations TABLE OF CONTENTS i. LETTER TO DEVELOPER ........................................................................................... 2 I. RULES AND REGULATIONS A. TABLE OF CONTENTS ....................................................................................... 3 B. TERMS AND DEFINITIONS ............................................................................... 4 C. DEVELOPER’S RESPONSIBILITIES ............................................................... -
Power Distribution and Grounding of Audio, Video And
Integrating Electronic Equipment and Power into Rack Enclosures Optimized Power Distribution and Grounding for Audio, Video and Electronic Systems MAIN PANEL SUB PANEL (optional) Grounding Conductor Grounded Conductor (neutral) Ground Bar Neutral & Ground Bar Neutral (On insulators) Technical (isolated) Grounded Conductor “single-point” ground bar (Neutral & Ground on insulators combined) Enclosure From Technical (isolated) ground wire terminated Transformer in main panel only (no connection to sub panel ground) Building ground wire or conduit Isolated ground outlet conventional outlet Rev. 4b Table of Contents Preface ........................................................................................................................... 1 Neutral-Ground reversals .............................................................................................. 30 A Note about Signal Paths .............................................................................................. 2 Steps to Troubleshoot Bootleg Grounds and Neutral-Ground Reversals ....................... 32 Ground Loops and Signal Interconnections .................................................................... 2 Auxiliary Ground Rods ................................................................................................... 34 Signal Wiring: Unbalanced & Balanced Interfaces .......................................................... 3 Intersystem Bonding (Cable TV, Satellite TV, Telephone) ............................................. 35 AC Magnetic Fields -
QUESTION BANK with ANSWERS Unit I (ELECTRICAL CIRCUITS) PART a 1
BE 8253 - Basic Electrical, Electronics and instrumentation Engineering QUESTION BANK WITH ANSWERS Unit I (ELECTRICAL CIRCUITS) PART A 1. State Ohm’s law. (DEC 14) Ohm’s law states that the voltage (v) across a resistor is directly proportional to the current (i) flowing through the resistor, at constant temperature. ie, v α i ,v = iR, where R is the resistance (Ω). 2. State Kirchoff’s Current law. (MAY 13) KCL (Kirchoff’s Current Law) states that the algebraic sum of currents entering a node (or a closed boundary) is zero. (or)The sum of the currents entering a node is equal to the sum of the currents leaving the node. 3. State Kirchoff’s Voltage law. (MAY 13) KVL (Kirchoff’s Voltage Law) states that the algebraic sum of all voltages around a closed path (or loop) is zero. (or) Sum of voltage drop = Sum of voltage rise. 4. An Electric iron is rated 1000W, 240V. Find the current drawn & resistance of the heating element. P=V2/R ; R= 2402/1000 = 57.6Ω and I= V/R =240/57.6 = 4.166 A 5. Define i) charge ii) electric current iii) power iv) network & v) circuit. i) Charge: Charge is an electrical property of the atomic particles of which matter consists, measured in coulombs(C ). ii) Electric current is the time rate of change of charge, measured in amperes(A). i = dq/dt A direct current (DC) is a current that remains constant with time. An alternating current (AC) is a current that varies sinusoidally with time iii) Power is the time rate of expending or absorbing energy, measured in watts(w). -
Lecture 5: Electrical Supply and Distribution
Lecture 5: Electrical Supply and Distribution 5.1 Single Phase Electric Power There is only one phase, i.e. the current flows through only one wire and there is one return path called neutral line to complete the circuit. Single-phase comes to the home with two wires: active and neutral. The neutral wire is connected to earth (water pipe, earth stake, etc.) at the switchboard. Single-phase distribution is used when loads are mostly lighting and heating, with few large electric motors. Single-phase power is: Able to supply ample power for smaller customers, including homes and small, non- industrial businesses. Adequate for running motors up to about 10kw; a single-phase motor draws significantly more current than the equivalent 3-phase motor, making 3-phase power a more efficient choice for industrial applications. 5.2 Three Phase Electric Power It is the Polyphase system where three phases are send together from the generator to the load. Each phase are having a phase difference of 120°, i.e. 120° angle electrically. Therefore, from the total of 360°, three phases are equally divided into 120° each. The power in three-phase system is continuous as all the three phases are involved in generating the total power. Three-phase has four wires: three actives (called phases) and one neutral. The neutral wire is earthed at the switchboard. 3-phase power is: Common in large businesses, as well as industry and manufacturing. Large domestic installations sometimes have three-phase because it distributes the total load in a way that ensures that the current in each phase is lower.