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Seaward, Bracken Hill, South West Industrial Estate, Peterlee, County Durham, S

Seaward, Bracken Hill, South West Industrial Estate, Peterlee, County Durham, SR8 2SW United Kingdom Tel: +44 (0) 191 586 3511 Fax: +44 (0) 191 586 0227 Email: sales@seaward.co.uk Web: www.seaward.co.uk Seaward, Clare, Rigel Medical, Cropico, Seaward Group USA are all part of the Seaward Group Tried. Tested. Trusted. 1 7th Edition Testing A Guide to Tried. Tested. Trusted. This material is for information purposes and as general guidance only. It is not necessarily deemed definitive and is subject to change without notice. Seaward and its associated companies accept no responsibility for any errors or consequential loss or damage which may arise from misinterpretation of the information or procedures. However, every effort has been made to ensure the accuracy of information presented but the reader should refer to manufacturer / supplier data and relevant published standards when producing or using 17th Edition test procedures. 02 - 03 The Installation System 04 Introduction 04 - 09 A. Tests before the supply is connected 05 1. Continuity of protective conductors including main and supplementary equipotential bonding 06 2. Continuity of ring final circuit conductors 07 3. Insulation resistance 08 4. Polarity 09 5. Earth electrode resistance 12 - 14 B. Tests with the electrical supply connected 12 1. Earth fault loop impedance 13 - 14 2. RCD testing 14 - 17 Appendix 14 1. Continuity testing 15 - 17 2. Insulation resistance testing 18 - 19 PowerPlus 1557 20 - 21 17th Edition product range Tried. Tested. Trusted. Contents Installation systems Technological advances are transforming the installation tesing industry. Our Testers are at the forefront. 3 Tried. Tested. Trusted. Today’s world moves at an unprecedented pace. Everything’s smarter, smaller and faster. This is good news for us, and for you. It means we’re developing and manufacturing better equipment and we can now help your business or institution become more efficient and effective. We call it PowerSolutions. This comprehensive process involves everything from choosing your installation tester and software,to following up with calibration services. It streamlines your processes, reduces costs, increases productivity and improves profits. 2 Test & Inspection Software The Seaward Installation System. Less paper and less hassle. Tester Print Certificates Carry out your testing - the PowerPlus 1557 automatically saves measurements to the built-in certificates. It also saves work-in-progress for you to resume at any time. Once complete, print your inspection results directly onto NAPIT, NICEIC, ECA or BS7671 stationery and supply client completed 17th Edition certificate. Transfer a copy of the data into the built-in certificates within the tester via Bluetooth connectivity. Or enter manually into PowerPlus 1557 using the alphanumeric pad. Transfer the data back onto the PC and edit your recorded information back at the office using the PowerPlus PC software. Or edit it manually into the tester using the alphanumeric keypad. Create partially completed certificates using test and inspection software PowerPlus PC. i. Continuity of circuit protective conductors (CPC) The purpose of this test is to verify that the CPC forms a continuous path around the circuit under test. The test is carried out (using either or both methods shown) as follows: Test Method 1: a) Temporarily link the line conductor to the CPC in the Consumer Unit. b) Test between the line and the CPC at each accessory point e.g. a ceiling rose, switch or socket outlet. The reading obtained at each accessory point should be a low resistance value. The resistance measured at the extremity of the circuit is the sum of the resistances of the line conductor and protective conductor (R1 + R2) and should be equal to the value obtained by using Tables 9A, 9B, and 9C in the IEE On-site Guide. See Diagram 2. Test Method 2: Using a long test lead, test between the earth bar in the consumer unit and the CPC at each accessory point. The reading obtained at each accessory point should be a low resistance value. The resistance measured at the extremity of the circuit is the resistance of the circuit protective conductor (R2) and should be equal to the value obtained by using tables 9A, 9B, and 9C in the IEE On-site Guide. See Diagram 3. Diagram 2: CPC Test (Method 1) Diagram 3: CPC Test (Method 2) 5 Tried. Tested. Trusted. Introduction Regulation 610.1 of BS 7671:2008 IEE Wiring Regulations Seventeenth Edition requires that every installation shall, during erection and on completion before being put into service, be inspected and tested to verify, so far is reasonably practicable, that the requirements of the Regulations have been met. Regulation 610.4 states that for an addition or alteration to an existing installation, it shall be verified that the addition or alteration complies with the Regulations and does not impair the safety of the existing installation. The guidance given in this booklet is divided into two sections, tests carried out before the electrical installation is energized and those carried out with the installation energized. The tests specified by Regulation should be carried out in the following sequence: A.Tests before the supply is connected. 1. Continuity of protective conductors including main and supplementary equipotential bonding. (Regulation 612.2.1) 2. Continuity of ring final circuit conductors (Regulation 612.2.2) 3. Insulation Resistance (Regulation 612.3) 4. Polarity (Regulation 612.6) 5. Earth electrode resistance (Regulation 612.7) B.Tests with the electrical supply connected. 1. Earth fault loop impedance (Regulation 612.9) 2. Check of phase sequence (Regulation 612.12) 3. Functional testing (Regulation 612.13) 4. Verification of voltage drop (Regulation 612.14) A. Tests before the supply is connected 1. Continuity of protective conductors including main and supplementary equipotential bonding. Every protective conductor, including circuit protective conductors, the earthing conductor, main and supplementary bonding conductors should be tested to verify that all bonding conductors are connected to the supply earth. Tests are made between the main earthing terminal (this may be the earth bar in the consumer unit where there is no distribution board present) and the ends of each bonding conductor. The reading obtained at each point should be a low resistance value. See Diagram 1. Diagram 1: Continuity of Protective Bonding Conductors 4 www.seaward.co.uk CONSUMER UNIT (only Earth Bar shown for clarity) Main Earthing Terminal WATER SERVICE PIPE BS 951 Clamp with Label to be used within 600mm of the meter union outlet or at the point of entry where the meter is external to the building GAS SERVICE PIPE CONSUMER UNIT EARTH BAR LINK L ACCESSORY NOTE: NEUTRAL CONDUCTOR OMITTED FOR CLARITY CONSUMER UNIT EARTH BAR LINK L ACCESSORY NOTE: NEUTRAL CONDUCTOR OMITTED FOR CLARITY T LONG TEST LEAD ii) Link L1 to N2 and L2 to N1 iii) Measure the resistance between line and neutral at each socket outlet. The readings at each outlet should be the same and approximately equal to (r1 + rn) / 4. Note: Any sockets wired as spurs will have a higher resistance due to the resistance of the spur. Diagram 5: Stage 2 (carried out in Consumer Unit) Stage 3 Confirm the absence of bridges in the ring circuit. i) In the Consumer Unit link L1 to CPC2 and L2 to CPC1. ii) At each socket outlet, measure the resistance between L and CPC. The reading at each socket outlet should be the same resistance value and should be approximately (r1 + r2) / 4. The highest value measured is the maximum (r1+r2) of the circuit. Note: Any sockets wired as spurs will have a higher resistance due to the resistance of the spur. Diagram 6: Stage 3 (carried out at each socket outlet) 3. Insulation resistance The purpose of the insulation resistance test is to confirm that when all loads have been disconnected, no current carrying paths exist between L and N conductors or between live conductors and CPC, i.e. there is sufficient insulation between the conductors. The test is carried out in the following manner: a. Ensure that all loads are disconnected, all fuses are in place and that all switches and circuit breakers are in the ON position. When a circuit contains a two-way switch, insulation tests should be carried out while each of the two switches is operated to ensure that all wiring is tested. 7 Tried. Tested. Trusted. ii. Continuity of earthing conductor and protective bonding conductors Using a long test lead, test between the earth bar in the consumer unit and the protective bonding conductor at its furthest end e.g. at the connection to the incoming water, gas or oil service. The reading obtained at each accessory point should be a low resistance value. 2. Continuity of ring final circuit conductors The purpose of this three stage test is to verify that : a) The line, neutral and protective conductors form a continuous path around the circuit. b) The ring circuit is wired correctly and consists of one loop only i.e. there are no `bridges'. The tests are carried out as follows: Stage 1 Confirm that each conductor forms a continuous path around the circuit. i) Identify the ends of the line, neutral and protective conductors in the Consumer Unit as follows: Cable uploads/Geographie/ 17th-edition-testing-guide.pdf