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30.11.05suite4121 Inspection & Test Overview. 30.11.05suite4122 Why does an electrical installation require Inspection and Testing? BS 7671:2001 711-01-01.

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Presentation on theme: "30.11.05suite4121 Inspection & Test Overview. 30.11.05suite4122 Why does an electrical installation require Inspection and Testing? BS 7671:2001 711-01-01."— Presentation transcript:

1 suite4121 Inspection & Test Overview

2 suite4122 Why does an electrical installation require Inspection and Testing? BS 7671: Every installation shall, during erection and on completion before being put into service be inspected and tested to verify, so far as is reasonably practicable, that the requirements of the Regulations have been met

3 suite4123 Before being put into service “It’s ok misses we've finished the electric's, we've put the supply on”. “be back next week to test it” Simple: If it has not been inspected and tested, it should not be energised. No discussion - No connection!

4 suite Inspection The inspection shall be made to verify that the installed electrical equipment is: (i) in compliance with Section 511 compliance with standards - British Standards or, Harmonized Standard (ii) correctly selected and erected in accordance with the Regulations (iii) not visibly damaged or defective so as to impair safety

5 suite4125 Certification

6 suite4126 Every Inspection and Test must be recorded on the appropriate certificate

7 suite4127 The Installation Certificate “Where do I use it?”

8 suite4128 For new installations For alterations or additions that include a new circuit

9 suite4129 The Installation Certificate “what does it consist of?”

10 suite41210 Details of client Installation address - Must include post code Description and extent of the installation Signatories those with a responsibility for (i) The design (ii) The construction (iii) The inspection and testing Recommend date for next inspection

11 suite41211 Who recommends the date for the next inspection (Periodic) ? THE DESIGNER

12 suite41212 Who recommends the date for subsequent inspections and tests (Periodic) ? THE INSPECTOR

13 suite41213 SUPPLY CHARACTERISTICS AND EARTHING ARRANGEMENTS TN-C (of specialist nature) TN-S TN-C-S TT IT (of specialist nature)

14 suite41214 Number and type of live conductors whether the supply is a.c. or d.c. number of phases number of poles

15 suite41215 Nature of Supply Parameters nominal voltage U/Uo (V) Fixed nominal frequency, f (Hz) Fixed external loop impedance Z e (  ) prospective fault current, I pf (kA)

16 suite41216 Prospective Fault Current ( Ipf ) kA May be obtained by Measurement Calculation Enquiry Public Electricity Supply (PES)

17 suite41217 External loop impedance Ze May be obtained by Measurement Calculation Enquiry

18 suite41218 Supply Protective Device Characteristics (PES) Type i.e. BS 1361 Type 2, BS 88 Nominal current rating (A)

19 suite41219 Particulars of installation referred to in the certificate Means of earthing Maximum demand (Not rating of Maximum demand (Not rating of service head fuse) service head fuse) Details of earth electrode resistance Details of earth electrode resistance if applicable

20 suite41220 Review - Characteristics of Supply The following characteristics of the supply or supplies, from whatever source shall be determined by calculation, measurement, enquiry or inspection

21 suite41221 The nominal voltage/s The nature of the current and frequency The prospective short circuit current Earth fault loop impedance Ze Maximum demand after diversity Type and rating of overcurrent device at the origin of the installation

22 suite41222 Main Protective Conductors Earthing Conductor Material Cu - copper etc c.s.a Connection verified (low resistance ohmmeter)

23 suite41223 Main Equipotential Bonding Conductors Material Cu - copper etc c.s.a Connection verified (low resistance ohmmeter recommended maximum value 0.05  )

24 suite41224 BS /BS EN Number Number of Poles Current Rating Voltage Rating

25 suite41225 Main Switch or Circuit Breaker BS Type and Number of Poles Current rating (A) Voltage rating Fuse rating or setting Location RCD I  n (mA) and operating time (mS) at I  n

26 suite41226 Comments on Existing Installation To be used for alterations or additions

27 suite41227 Schedule of items inspected Refer to Schedule Common to both Installation & Periodic Inspection Report

28 suite41228 The Visual Inspection Chapter 71 Initial Verification Footnote to Regulation Precautions shall be taken to avoid danger to persons and to avoid damage to property and installed equipment during inspection and testing

29 suite41229 The Visual Inspection 712 Inspection Inspection shall precede testing and shall normally done with that part of the installation under inspection disconnected from the supply

30 suite41230 Test equipment to GS 38 Probes 4mm max pref 2mm max Fused Leads Finger Guards Safe Isolation

31 suite41231 Schedule of Test Results Refer to Schedule Common to both Installation & Periodic Inspection Report

32 suite41232 Periodic Inspection Report (PIR) Change of use or ownership As a result of damage. Fire - Flood etc Electrical overloading To ensure compliance/continued compliance with the Regulations Mortgage/Insurance request Local bylaws - Places of public entertainment - Theatres/Cinemas etc

33 suite41233 Periodic Inspection Report (PIR) Some areas common to Installation Certificate, i.e. Details of client and installation Recommended next inspection date Signature of competent person Supply characteristics Particulars of installation

34 suite41234 (PIR) continued Schedule of inspection Schedule of test results

35 suite41235 Major Differences Estimated age of installation? Evidence of alterations or additions? Are there records available? Extent and limitations Observations and recommendations

36 suite41236 Extent and Limitations Extent - Details indicating what part/s Extent - Details indicating what part/s of the installation will be inspected and tested tested Limitations - State exactly what items are excluded, i.e. portable appliances, fire alarm systems, emergency lighting, cctv, door entry systems, smoke detectors etc.

37 suite41237 Numerical code Numerical code Departures from BS 7671 must be allocated a numerical code 1. requires urgent attention 2. Requires improvement 3. Requires further investigation 4. Does not comply with BS imply that installation is unsafe

38 suite41238 Minor Works An alteration or addition to an existing installation that does not include the addition of a new circuit, i.e. spur to radial or ring circuit etc.


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