<p>it is assumed that this testing will be carried out over weekends when the cabins will be cleared of site staff.</p><p>The Periodic Inspection and Testing of a Low Voltage Electrical<br />Installation.<br />Purpose of the Periodic Inspection and Test<br />BS7671:2008(2013) (Ref.1) Regulation 621.1 sets out the general requirement for<br />electrical installations to be inspected and tested to, &ldquo;determine, so far as reasonably<br />practicable, whether the installation is in a satisfactory condition for continued service&rdquo;.<br />IEE Guidance Note 3 (Ref.5) provides further guidance for the purpose of periodic<br />inspection and testing.<br />The purpose of the Periodic Inspection and Testing is to provide, so far a reasonably<br />practicable, for:<br />1. The safety of persons and livestock against the effects of electric shock and burns<br />in accordance with the general requirements of Regulation 131.1 of BS7671:2008<br />(2013). and<br />2. Protection against damage to property by fire and heat arising from an installation<br />defect, and<br />3. Confirmation that the installation is not damaged or deteriorated so as to impair<br />safety, and<br />The identification of installation defects and non-compliance with the requirements of the<br />Regulations (BS7671:2008(2013)) which may give rise to danger<br />Report Format<br />The report will be in the format of a National Inspection Council for Electrical<br />Installation Contracting (NICEIC) Electrical Installation Condition Report (EICR). Any<br />defects or departures from BS7671 (The Wiring Regulations), that may give rise to<br />danger found will be itemised in the report.<br />2<br />Personnel<br />Only Inspecting Engineers who hold the City and Guilds 2391 Qualification in the<br />Inspection and Testing of Electrical Installations and the City and Guilds 2382<br />Qualification in Requirements for Electrical Installations (BS7671:2008) will be<br />employed on site to carry out the inspection and testing of the electrical installation.<br />Inspecting Engineers may be assisted by staff without the above qualifications but they<br />will be directly supervised by the Inspecting Engineer.<br />Installation Records<br />The client will be requested to supply any drawings, diagrams, circuit charts, design data<br />or other records for the installation to be inspected and tested that are held by the client.<br />Previous test certificates and reports held by the client will be requested for information.<br />Preparation<br />This service requires the electrical installation to be isolated from the supply to permit the<br />safe inspection and testing of the installation. The client will be requested to switch off<br />and unplug any appliances prior to commencement of the survey. The client will also be<br />requested to shut down and switch off any computers, servers, hubs, communication<br />systems and other IT equipment to permit disconnection of the electrical supply and<br />testing of the installation.<br />Extent of the Installation to be Surveyed<br />The fixed low voltage electrical installation from the company supply intake position,<br />distribution boards, distribution circuits and final circuits up to the equipment terminals<br />excluding:-<br />1. Telephone, alarm, CCTV, data, intercom, call system wiring, heating control<br />wiring circuits.<br />2. Portable appliances.<br />3. Emergency lighting systems other than the low voltage supply to any system.<br />4. Any lift or hoist installation.<br />5. Medical or laboratory equipment.<br />6. Equipment such as building services plant, motors and control equipment other<br />than to confirm earth continuity of readily accessible plant.<br />7. Lightning protection systems other than to confirm any required main protective<br />bonding.<br />8. Any high voltage equipment.<br />9. Any equipment belonging to the electrical supply company or meter operator<br />other than a visual inspection of the outside of any readily accessible equipment.<br />10. Servers, computers or other IT systems.<br />3<br />11. UPS and Power Factor Correction equipment other than the visual inspection of<br />the readily accessible outer parts.<br />12. Radio transmitters or receivers including mobile telephone equipment.<br />13. Any potentially explosive areas such as fuel pumps, gas, paint and liquid fuel<br />storage areas and paint spray booths.<br />13. Any part of the installation not in service at the time of the inspection and testing.<br />Limitations of the Inspection and Testing.<br />1. Only those parts of the installation that can be readily and safely accessed by the<br />inspecting engineer will be inspected or tested.<br />2. No part of the installation containing asbestos, or substance having the appearance<br />of asbestos, will be dismantled for inspection or testing.<br />3. No insulation resistance testing will be carried out between live conductors due to<br />the possible presence of any electronic devices. Where a distribution board can be<br />safely isolated the insulation resistance will be measured between live conductors<br />and earth for whole distribution boards to verify compliance with BS7671:2008.<br />Alternatively where the distribution supply conductors are suitably arranged a live<br />earth leakage test will be carried out using a sensitive clamp meter to verify the<br />total earth leakage for the board. This will indicate the integrity of the final circuit<br />insulation resistance.<br />4. Where the means of earthing for the installation cannot readily or safely be<br />disconnected the external earth loop impedance (Ze) will be measured with the<br />earthing conductor connected to the installation.<br />5. Earth continuity will be verified by earth loop impedance testing and the value of<br />R1 + R2 will be calculated from Zs- Zdb.<br />6. Where design information is not available it will not be possible to verify any<br />adjustable settings on circuit protection devices are correctly set.<br />7. All readily accessible sockets and 20% of light fittings and fixed equipment will<br />be tested for earth loop impedance and earth continuity<br />8. The highest measured value of earth loop impedance (Zs) will be recorded for<br />each type of circuit. Lighting circuits and fixed plant will be earth loop impedance<br />tested by injecting a test current from an adjacent socket. If the reading obtained<br />is close to the maximum value of Zs permitted in BS7671 for the type of circuit<br />protection device a further test will be carried out using the lighting circuit as a<br />source of supply.<br />9. Circuits with high levels of harmonics and circuits close to HV/LV supply<br />transformers may produce inaccurate earth loop impedance test result readings.<br />10. Where there are insulation resistance defects between live conductors and earth<br />this may impact on earth loop impedance readings. Following rectification of<br />these earth resistance defects further earth loop impedance tests must be carried<br />out to confirm the values of earth loop impedance are satisfactory.<br />4<br />11. Equipment above 3M from ground or floor level will not be inspected. A sample<br />of this equipment will be tested for earth continuity with an insulated extending<br />pole with a test probe attached.<br />12. The assessment of distribution circuits and equipment will generally be carried<br />out by inspection. The earth loop impedance of distribution circuits will be carried<br />out if it is safe to do so. Insulation resistance testing will not be carried out on<br />these circuits if they are constructed using PVC, XLPE cables, power track or bus<br />bar systems.<br />13. In the absence of design data circuit voltage drops cannot be verified. Final circuit<br />voltages will be sample measured for excessive reductions.<br />14. Where any circuit is not identified, or cannot readily be identified, the circuit<br />details will be recorded for conductor sizes, circuit protection devices and wiring<br />type. The circuit designation and the test results will be recorded as &ldquo;Not Found&rdquo;.<br />15. Any defects or departures from the requirements of BS7671: 2008 will be<br />recorded in the report under the &ldquo;Observations and Recommendations&rdquo; section.<br />16. The resilience of the installation to the partial or total loss power will not be<br />tested.<br />Process<br />The survey will cover the following items for inspection and testing.<br />&middot; A visual inspection of those parts of the installation that can readily and safely be<br />accessed.<br />&middot; The supply characteristics.<br />&middot; Earth continuity testing.<br />&middot; Where ring final circuit conductors can be identified a continuity test will be<br />carried out.<br />&middot; Insulation resistance testing of distribution boards between live conductors and<br />earth where the distribution board can be isolated for testing. Alternatively if the<br />supply conductors are suitably arranged an earth leakage test will be carried out<br />using a sensitive clamp meter to determine total earth leakage for the distribution<br />board.<br />&middot; The Polarity of supplies to distribution boards, sockets and a sample of lighting<br />and fixed equipment.<br />&middot; Earth Electrode Resistance Testing if an earth electrode is fitted.<br />&middot; An assessment of arrangements for Automatic Disconnection of the Supply.<br />&middot; Earth Fault loop Impedance.<br />&middot; The operation of Residual Current Devices (RCDs).<br />&middot; Prospective Fault Current at each distribution board.<br />&middot; Phase Rotation for 3 phase installations.<br />&middot; Functional testing of a sample of circuits and equipment.<br />&middot; An assessment of the voltage drop in the installation.<br />5<br />Reporting of any Defects and Departures from BS7671:2008<br />Following the testing and inspection of an installation any defects or departures from<br />BS7671:2008(2013) that may give rise to danger will be recorded. The defect of<br />departure will then be allocated a Recommendation Code depending on the nature of the<br />defect or departure. These codes are numbered C1 to C3 and are listed below.<br />Code C1. Danger Present.<br />Code C2. Potentially Dangerous.<br />Code C3. Improvement Recommended.<br />Overall Assessment<br />Following the inspection and testing of the installation the inspector will consider the<br />condition and come to a conclusion and make an overall assessment. This overall<br />assessment will either be &ldquo;Satisfactory&rdquo; or &ldquo;Unsatisfactory. If there are Code C1 or Code<br />C2 defects present the installation will automatically be assessed as &ldquo;Unsatisfactory&rdquo;.<br />6<br />Standards and Reference Documents<br />Where appropriate the following standards will be applied and reference documents<br />referred to.<br />1. British Standard 7671:2008 (2013) AMD2 Requirements for Electrical<br />Installations 17th Edition.<br />2. The Electricity at Work Regulations 1989.<br />3. The Health and Safety Executive Guidance Note GS38.<br />4. The Health and safety at Work Act 1974.<br />5. The Institute of Electrical Engineers Guidance Note 3 (GN3). 6th Edition.<br />6. British Standard EN 61557 Electrical Safety. Test Equipment<br />7. British Standard 5266. Emergency Lighting.<br />8. The NICEIC The Inspection, Testing and Certification Manual 5th Edition.</p><p>we envisage the above works to be carried out over 2&nbsp;no. weekends with a team of 6&nbsp;no. testers and 2&nbsp;no. electricians.</p><p><strong>Our total cost to carry out the above works out of normal working hours shall be &pound;12,400.00+VAT</strong></p><p><strong>BREAKDOWN</strong></p><p><strong>Labour&nbsp;- &pound;12,000.00+VAT</strong></p><p><strong>Electrical installation conditioning report- &pound;350.00+VAT</strong></p><p><strong>Materials - &pound;50.00+VAT</strong></p>