BS : Amd Introduction
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1 BS : Amd Introduction Day 1 Course design: Who the course is for? Statutory relationships BS7671 at a glance, Major Changes New numbering system Scope and fundamental requirements Part 1 Definitions Part 2 Assessment of Characteristics Part 3 Protection for Safety Part 4 June 2014 Legh Richardson 1.1
2 BS : Amd Introduction Day 2 Protection for Safety Overcurrents and Voltage disturbances Part 4 Selection and Erection Part 5 Day 3 Selection and Erection Part 5 Inspection and Testing Part 6 Special locations Part 7 Day 4 Special locations Part 7 Appendices
3 17 th Ed. BS amd. 3 :2015 June 2014 Legh Richardson 1.3
4 BS : Amd Introduction 1st Jan 2015 and is intended to come into effect on 1st July Installations designed after 31st Dec 2014 are to comply with BS 7671:2008 incorporating Amendment No 3, New numbering system The 17th edition introduced a new IEC decimal point numbering system Jan 2011 Amd. 1. to make it easier to embody future changes and additions resulting from ongoing international standards work within IEC and CENELEC. regulations. the current regulation becomes and regulation will become etc. This change has now been superceded some.100 regs have been further subdivided to cater for UK only regs and given.200 prefix
5 BS : Amd Introduction Numbering System These changes have already taken place and with effect from January 2015 it has been decided to have a.100 numbering system for CENELEC HD docs and.200 for UK only regulations. General rule EN- cenlec HD UK only Example becomes becomes
6 Changes at a glance Amd. 3 :2015 Numbering System and cross referencing The numbering system still follows the part, chapter, section, regulation separated by a dot. Where reference to a particular generic section is made. It is then included as part of the path in the special location Eg: might become
7 BS : Amd Purpose Primary purpose: Continued harmonization with the International Standards and numbering system (IEC) European Standards (CENELEC) IEC 364 IET JPEL/64 committee Protective methods for ordinary Persons IEC CENELEC EN Docs..100 JPEL/64 BS HD Docs..200 UK only June 2014 Legh Richardson 1.7 7
8 BS : Amd Purpose Essence of the regulations has not changed Still provides guidance to the EAWR 1989 Safety for persons, Livestock and Property Safe Working Practices Competence, of workforce Quality of materials Adherence to international standards. June 2014 Legh Richardson 1.8 8
9 BS : Amd Purpose Changes concern: 1. Numbering, layout and diagrams 2. Definitions 3. Additional special locations covered 4. Additional Appendices 5. Old Appendices amended and changed 6. Methods of protection 7. Provision for detrimental influences (EMI) 8. Technical specs, (volt drop, Zs, ) 9. Greater emphasis on Documentation June 2014 Legh Richardson 1.9 9
10 BS7671: Extra Future changes Previously as part of 17 th Ed development 6 main areas of development 5 of which are included within amendment 1; these are: Section Medical locations Section 719 Lighting Installations for Advertising signs Section 729 Operating or Maintenance Gangways Section Measures against Electromagnetic Influences, Section Devices for Protection against Overvoltage ( SPDs -Surge Protection Devices) BS 7671 Minor changes to the Numbering system Amd 3: these are: 714 and 715 outdoor and ELV lighting 722 Charging units and electrical supply for electric vehicles
11 Future Changes Section 719 Section 719, which is still at an early stage of development, applies to lighting installations for advertising signs with a rated output voltage not exceeding V, which are illuminated by hotcathode fluorescent-lamps, luminous discharge tubes (neon-tubes), inductive discharge lamps, light emitting diodes (LED) and/or LED modules. The Section specifies the requirements for the installation and testing of all kinds and sizes of illuminated signs with a no-load rated output-voltage up to 1000 V, including the electrical components and wiring. Installations used for signs, light-artworks and decorative purposes are covered, which may be either fixed or portable, supplied from a low voltage or extra-low-voltage source by means of a transformer, inverter, converter ballast or similar equipment
12 Safety and Legislation BS7671 is still not a Statutory Document Part P of Building Control Regulations Requires Self-certified Electrical work complying to BS7671 or equivalent even though it has a British Standard number It is backed by at least 16 Statutory Docs.: A list is given in Appendix 2 Health and Safety At Work Act 1974 Electricity Safety, Quality and Continuity Regulations 2002 (Electricity Supply Regulations 1988) Electricity At Work regulations 1989 Plugs and Sockets Regulations 1994 Management of Health and Safety 1999 Construction, Design and Management regs 2014 June 2014 Legh Richardson
13 BS onwards (2015) Legislation Electricity at Work Regulations 1989 and Health and Safety at Work Act 1974 If you are negligent or your work does not conform to a recognised British Standard or other IEC EU regulations then you are likely to be liable under the mentioned statutory acts. You could be prosecuted if you are unable to prove competence to self-certify to BS7671 (note: this does not preclude other EU regs) EAWR 1989 is not pre-emptive but will only come into effect after death, injury, damage to property and or livestock and will most likely to be served by the H&SE Building Control regulations are statutory and are pre-emptive that is poor workmanship could cause prosecution without death, injury or damage June 2014 Legh Richardson 1.13
14 History BS Numbering at a glance 14 th Edition 1966; Reprinted in 1968,1969,1970,1972,1973, th Edition 1981; Reprinted in 1983,1984,1986,1987, th Edition 1991; Reprinted in 1992 as BS7671, 1994, 1997, 2000, 2001, exam criteria changed, th Edition 2008; Reprinted in 2011, 2015 As amendments are made the colour of the cover also changes Red, Green, Yellow, Blue, Brown. BSI rules allow 2 amendments within changes in Edition so the structure of amendment changes may well change again. June 2014 Legh Richardson
15 BS7671: 2008 Numbering system at a glance New Numbering System 15th Ed.- Main Regs.; 17 Appdxs ( ) - Editions and Ammendments 16th Ed - Main Regs.; 15 SPLs; 7 Apdx; OSG; 7-8 GNs ( ) 17 th Ed. Main Regs.; 13 SPLs; 15 Apdx; OSG; 8 GNs (2008-PD) Amd.1 Main Regs.; 15 SPLs; 16 Apdx; OSG; 8 GNs, ebook5 (2011) Amd.2 Main Regs.; 16 SPLs; 16 Apdx; OSG; 8 GNs, ebook (722) Amd.3 Main Regs.; 17 SPLs; 17 Apdx; OSG; 8 GNs, ebook (2015) Greater number of special locations allows for deviations from the standard circuit arrangements, as prescribed by OSG, June 2014 Legh Richardson
16 BS amd : Layout Part 1: Sets out the scope, Objects and Fundamental Principles Part 2: Defines the words and phrases used in the regulations Part 3: Outlines the Supply characteristics available or/and required for each type of installation Part 4: methods of Protection available for humans, property and livestock Part 5: methods of installation and design available in selecting and erecting equipment and systems Part 6: Inspection, testing and certification of electrical installations Part 7: Particular precautions for locations where special requirements against shock and fire are necessary Appendix 1-17 technical guidance on various parts of BS7671 June 2014 Legh Richardson
17 BS Numbering Structure and Numbering Previous changes The zero (0) previously used has been dropped. The Hyphen (-) between numbers has been changed to a dot (.) Regulations such as have become Some sections have been combined together such as section 527. This had four groups (527-01, , , ) have now become 527.1, and Various parts of the 16 th ed regarding practical application have been combined together under Selection and Erection (Part 5) Example: 46, 471, are now included into 537 (2008) Part 6 (old part 7) Chapter 607 has now been moved into 543 (2008) June 2014 Legh Richardson
18 BS th ed 2015 Lighting in amendments 1 and 2 was combined in 559 Now amendment 3: Has 2 new special locations 714 Outside and utility lighting street lights, gardens, parks etc. 715 ELV Lighting New numbering for CENELEC and Europe refers to specific regs includes (EN docs) Regs specific to GB 100 = 200 etc...101, 102, 103 = 201, 202, 203 (HD docs) June 2014 Legh Richardson
19 BS Numbering Regulation Numbering General regulations becomes Special Locations becomes but now includes the reference to the application of methods of protection Note: 702[ ].4.1 { } Note: the general method of protection is embedded into the specific method of protection required for a special location June 2014 Legh Richardson
20 Numbering System Regulation Numbering Addition to the numbering system Where regulations specifically for GB an additional numbering has been included. Allows us to distinguish the Harmonized (HD 364 rules [.200] for GB users only, from European Normalization regs [.100] (EN)
21 BS : Numbering system Tables have 2 numbers followed by another number representing the position of the table in the chapter and sometimes followed by a letter to indicate its position in the sub-group Example 1: 4x.Xx Part 4 41.Xx Chapter x The second set of tables in chapter a The actual table Example 2: Chapter 54 application of providing an earthing conductor (17 th ed) = 54b 54f (16 th ed) June 2014 Legh Richardson
22 BS : Numbering System The Main Regulations The first numbers represent: the Part, Chapter and section Second number represents the regulations and/or groups of regulations associated with a particular area It also represents the part, chapter, section referred to elsewhere example might be bathrooms 701 Example Protection for Safety Protection against Electric Shock Automatic Disconnection of Supply Requirements for Fault Protection Protective Earthing and Equipotential Bonding (.1.2) Protective Earthed Equipotential Bonding June 2014 Legh Richardson January 08 Legh Richardson
23 Example 3: BS : Numbering System The proximity of non-wiring systems in A721 can be found as a general requirement in Example 4: Electrical supply generation for fair ground equipment (740) is located in the general requirements under.. Example 6: Additional protection by the use of Residual Current Devices as mentioned in can be further clarified in.. and in.
24 BS amd 3 Numbering Appendices: comparison table 16 th ed th ed th ed th ed British standards 1 updated 1- updated 1 updated 2 Statutory Regs 2 updated 2 updated 2 updated 3 Time/current: fuses/mcbs 3 updated + additions 3 updated 3 Cmin 3ac 4 - Current carrying capacities 4 the same 4 updated 4 the same 5 external influences 5 the same 5 updated + 5 the same 6 Model forms EIC/EICR 6 the same + 6 major changes 6 RA for RCDS, F1 7 Harmonized cable colours 7 the same 7 no change 7 no change 8 busbar capacities 8 no change 8 updated 9 supply systems+dc 9 no change 9 no change 10 parallel conductors 10 - no change 10 no change 11 harmonics 11 removed to App4 11 removed App 4 12 Volt drop 12 removed to app4 12 removed App 4 13 IR to rooms 13 no change 13 no change 14 efli adjustments 14 no change 14 Cmin 15 rfc and radials 15 no change 15 no change 16 EMC requirements 16 no change June 2014 Legh Richardson
25 BS : Numbering System Tables and diagrams in the Appendix The number of the appendix followed by a letter to indicate its position; followed by another number to indicate sub-section; followed by another letter to indicate the specific table Example 1: 4D3B 4XXX: Appendix 4 current carrying capacity of cables 4DXX: Fourth group of tables for 70 PVC cables 4D3X: Third table in group single core armoured 4D3B: second table in the pair of tables Max. Volt Drop June 2014 Legh Richardson
26 BS Number changes Tables in BS ,.2,.3 etc. Note the changes across the last 11 years 16 th th th 2015 Amd 3 41A Disconnection times 41.1 Disconnection times includes C.min 41B1, Max Zs, 0.4s 41.2 Zs max for fuses 41.2 Zs max for fuses 41B2, Max Zs 0.4s MCBs 41.3 Zs max for MCBs 41.3 Zs max for MCBs 41C R2 max for <50V 41.4 Zs max < 5s for fuses 41.4 Zs max < 5s for fuses 41D Zs max for 5s 41.5 Zs max for RCDs 41.5 Zs max for RCDs 41E IT max times 41.6 Zs max for RLV 41.6 Zs max for RLV
27 BS : Numbering System On-Site Guide Section 1: Introduction Section 2: The Service Position Section 3: Protection Section 4: Earthing and Bonding Section 5: Isolation and Switching Section 6: Labelling Section 7: Final Circuits Section 8: Locations containing a bath or shower Section 9: Inspection and Testing Section 10: Guidance on initial testing of Installations Section 11: Operation of RCDs June 2014 Legh Richardson
28 BS : Numbering System OSG Appendix Appendix 1: Maximum Demand and Diversity Appendix 2: Max Measured earth fault loop impedance Appendix 3: Selection of cable and flexible cord Appendix 4: Methods of support Appendix 5: Cable capacities of conduit and trunking Appendix 6: Current carrying capacities and volt drop of copper conductors Appendix 7: Certification and Reporting Appendix 8: Standard Circuit Arrangements Appendix 9: Resistance of Copper and Aluminium Conductors Appendix 10: Selection of devices for Isolation and Switching Appendix 11: Identification of Conductors Index
29 BS : Numbering System OSG cross referencing with main regulations using blue regulation numbering on the side of the page
30 BS7671: 2008 C&G 2382 Outcome 1 Outcome 1 Scope, object and fundamental principles The candidate will be able to: 1.1 Identify examples of installations in the scope of BS 7671 and particular requirements for specific installations and locations. (110.1) 1.2 Identify those installations that are excluded from BS (110.2) 1.3 Identify those statutory regulations that may be supported by BS (110.1, 114) 1.4 State the requirements for installations in premises licensed under the statutory control of an authoritative body. (115) 1.5 State the requirements regarding the fundamental principles relating to protection for safety, design, selection, erection, verification and certification of electrical installations (131,2,3,4) June 2014 Legh Richardson
31 BS7671:20015 Scope Regulations apply to: Domestic, Industrial and Commercial Premises Public Premises Agricultural and Horticultural Premises Prefabricated buildings and Caravans Construction Sites, Exhibitions, fairs Highway power supplies, Street Furniture, and Outdoor Lighting, ELV systems And now includes: Marinas, mobile or Transportable units, photovoltaic systems, Low-voltage generating sets, Medical Locations, vehicle charging, June 2014 Legh Richardson
32 Fundamental Principles and Scope (110.1) Regulations also apply to: BS 559, electric signs BS 5266, Emergency lighting BS EN 60079, BS EN 50014, flameproof installations BS EN 50281, dust proof installations BS 5839, Fire Alarms BS 6701 Part 1, Telecommunications BS 6351, electric surface heating BS 6907, open cast mines and quarries These BS numbers supplement the general wiring regulations June 2014 Legh Richardson January 08 Legh Richardson
33 Fundamental Principles and scope (110.2) Regulations do not apply to: Distribution and supply systems Signalling and trains Motor Vehicles except Caravans Ships and Off Shore Installations Aircraft Mines and Quarries Radio interference suppression equipment Lightning Protection covered by BS 6651* Lift Installations covered by BS 5655 Electrical Equipment of Machines (new) June 2014 Legh Richardson January 08 Legh Richardson
34 Fundamental Principles and Scope (131) Protection for Safety has been extended and includes: Shock currents Excessive temperatures Ignition of explosive atmospheres Voltage variations, under over, transients mechanical movement of electrical machines Power supply and safety service interruptions Effects of arcing June 2014 Legh Richardson
35 BS7671: Fundamental Requirements Basic Protection (Formally known as Direct Contact) Persons and livestock shall be protected from dangers that may arise from contact with live parts of an installation 1. Preventing a current passing through the body of any person or livestock 2. Limiting the current that can pass through the body to a safe value June 2014 Legh Richardson
36 BS7671:Fundamental Requirements Fault Protection (formally known as Indirect Contact) Persons and livestock shall be protected against dangers that may arise from contact with exposedconductive-parts during a fault. 1. Preventing a current resulting from a fault from passing through the body of persons or livestock 2. Limiting the magnitude of a current resulting from a fault, which can pass though a body, to a nonhazardous value 3. Limiting the duration a current resulting from a fault, which can pass through a body, to a nonhazardous time period June 2014 Legh Richardson
37 BS : Fundamental requirements (131.2) Protection for safety (Electric Shock) General requirements Basic Protection ( ) 1. Insulation, Separation 2. SELV, PELV, FELV Fault Protection ( ) 1. Automatic Disconnection 2. Double or reinforced Insulation 3. SELV, PELV, FELV 4. RCD/RCBOs June 2014 Legh Richardson
38 BS : Fundamental requirements (131.3) Protection against Thermal Effects ( ) 1. Combustion, ignition or degradation of materials 2. Risk of burns 3. Impairment of safe function of installed materials Protection against Overcurrent ( ) Protection for persons, livestock and property, against injury and damage due to excessive temperatures and electromechanical stresses Protection against Fault current (131.5) All conductive parts must be able to carry fault current without reaching excessive temperatures June 2014 Legh Richardson
39 BS : Fundamental requirements (131.6)Protection against Over-Voltages part 4 1. the effects of different voltages (HV-LV) Protection from Lightning and transient switching (inductive loading) Undervoltages Electromagnetic emissions (132) Design Part 3 (133) Selection and Erection Part 5 (134) Erection and initial verification Part 5/6 (135) Periodic Inspect and test Part 6 June 2014 Legh Richardson
40 BS7671 C&G 2382 Outcomes 2 Outcome 2: Definitions The candidate will be able to: 2.1 Use part 2 of BS 7671 in relation to all other parts of BS 7671 June 2014 Legh Richardson
41 BS Definitions Changes in Definitions 2008 Direct Contact Now becomes: Basic Protection (Part 2) Indirect Contact now becomes: Fault Protection (part 2) Supplementary Protection now becomes: Additional Protection (415) EEBADS now becomes: ADS, Automatic Disconnection of Supply (411) The general term Phase now becomes: Line (Part 2) Note: Phase and Line will still be used in teaching when referring to 3 phase line and phase currents and voltages A clarification of terms which are understandable by all June 2014 Legh Richardson
42 BS Definitions Definitions (Part 2) 2008 Competent Person (2015) now removed A person who possesses sufficient technical knowledge and experience for the nature of the electrical work undertaken and is able at all times to prevent danger, and where appropriate, injury, to themselves and others Note: the definition of Competent person in BS is exactly the same as regulation 16 of the Electricity at Work Regulations 1989 (EAWR 1989) Skilled Person (2015) June 2014 Legh Richardson
43 BS Definitions Changes in Definitions 2015 Competent Person Now becomes: Skilled Person (Part 2) and becomes: Instructed person (part 2) Control Circuit now becomes: Auxillary Circuit (part 5) Flameproof/flame retardant now becomes: Non-flame Propagating (422, 522) June 2014 Legh Richardson
44 BS7671 Amd Definitions A preview of acronyms explained in part 2
45 BS C&G 2382 Outcomes 3 Outcome 3: Assessment of general characteristics The candidate will be able to: 3.1 State the need to determine maximum demand for an installation. 3.2 Determine the characteristics of a supply. 3.3 State the source (eg standby, safety) and characteristics necessary for a supply. 3.4 State the need to divide an installation into suitable circuit arrangements. 3.5 Determine the number and types of live conductors for installation circuits. 3.6 Identify those external influences that determine the selection of equipment and installation methods/techniques. 3.7 State the need to consider compatibility and maintainability in the selection of equipment. 3.8 State the need for an assessment of each circuit regarding continuity of service June 2014 Legh Richardson January 08 Legh Richardson
46 Assessment of General characteristics Assessment of Characteristics part 3 Additions to Scope Supply Arrangements including earthing Safety services appropriate for installation: Fire Alarm (BS EN 5839), Emergency Lighting (BS EN 5266), Standby Systems Application covered in (56) Continuity of Service (dealing with interrupts to supply) EMI, CE compatibility Noise, Variable frequencies, June 2014 Legh Richardson
47 Assessment of General characteristics An assessment shall be made of the following characteristics 1. The purpose, structure and supply details (31) 2. External Influences (32) 3. Compatibility of its equipment (33) 4. Its maintainability (34) 5. Recognised Safety Services (35) 6. Assessment of continuity of service (36) June 2014 Legh Richardson
48 Supply Arrangements June 2014 Legh Richardson
49 Purpose, structure and supply details Maximum demand shall be taken into account (Number of circuits, loading requirements) characteristics of the supply shall be determined by calculation, measurement, enquiry or inspection 1. Nominal voltage including harmonics 2. Nature of current and frequency 3. PSCC at the origin 4. External Earth fault loop impedance 5. Suitability and maximum demand 6. Type and rating of the overcurrent protective device/s at the origin of the installation (433 and 434) June 2014 Legh Richardson January 08 Legh Richardson
50 Purpose, structure and supply details Every installation shall be divided into circuits so that: 1. Avoid hazards and minimize inconvenience in the event of a fault 2. Facilitate safe inspection, testing and maintenance 3. Account for dangers that may arise from single circuit failure such as lighting 4. Reduce nuisance RCD tripping through high protective conductor currents 5. Reduce the effects of electromagnetic interferences 6. Prevent the indirect energizing of a circuit intended to be isolated (314.4) Final circuits to comply with (43), (537), (52) each final circuit connected to a separate way in a distribution board June 2014 Legh Richardson January 08 Legh Richardson
51 Compatibility of characteristics assessment shall be made of characteristics that may detrimentally influence other services or supplies 1. Transient overvoltages (443) 2. Undervoltage (445) 3. Unbalanced loads 4. Rapidly fluctuating loads 5. Starting currents 6. Harmonic currents 7. Leakage current 8. Excessive protective conductor currents 9. D.c. feedback 10. High-frequency oscillations 11. Necessity for additional connections to earth 12. Power factor June 2014 Legh Richardson
52 Compatibility of characteristics 332 assessment of the effects of EMI and necessary EMC applied
53 Maintainability Maintainability shall be established Taking into account frequency and quality for the intended life span of the installation 1. PIRs, maintenance and repairs safely carried out 2. Effectiveness of protective measures do not diminish 3. Reliability of equipment for proper functioning June 2014 Legh Richardson
54 Continuity of Service Assessment of the need for certain circuits to be continuously operating within an electrical installation Examples might be: 1. life support systems, 2. Emergency systems, lights and fire detection 3. Monitoring systems for overload, heat Things to assess: 1. Wiring system 2. Discrimination of protective devices 3. Number of circuits 4. Multiple power supplies 5. Use of monitoring devices June 2014 Legh Richardson
55 DCLG Notification and Certification Third party Certification Competence of inspector 1. Cannot delegate k min. PI with a run on afterwards Requirements 1. Agreed contracts prior to start 2. BRCC will be issued by CPS 3. An EICR is not acceptable 4. Full cert is required by CPS to be audited 5. Installers name and position to be Identified on certs June 2014 Legh Richardson 1.55
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