Electrical Inspection and Testing CG 2391

1. Electrical Inspection and Testing C&G 2391 Module 2 Initial Verification

2. Initial Verification 711-01-01 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. Precautions shall be taken to avoid danger to persons and damage to property and installed equipment during the inspection and testing

3. Avoid Danger to Persons Have you checked to see if any essential services are supplied from the board e.g emergency lighting, fire alarms, life-support equipment, UPS systems, gas monitoring systems, etc. Have you isolated the circuit correctly Have you discharged any capacitors Is the test equipment appropriate for the environment e.g intrinsically safe Are you using long test leads that could cause people to trip over Have you informed people of the dangers

4. Avoid Damage to Property Is there an RCD in the circuit Are there computers on line Is there electronic equipment in the circuit Could gaskets be damaged when removing covers Are all the loads disconnected Is there any equipment or processes which may be damaged if disconnected for long periods of time Is there any essential equipment which cannot be turned off

5. HSE Guidance Note GS38Approved Voltage Tester Adequate insulation Have coloured leads to distinguish one lead from the other Have finger barriers Maximum of 2mm exposed probe Flexible and Robust Sheathed leads to prevent damage Long enough for their purpose No accessible parts even if the lead is loose Have fused leads

7. International Protection Code First Column Indicated by number protection against ingress of solid foreign bodies Second Column Indicated by number protection against ingress of water Third Column Indicated by letter protection offered to a person against contact with a dangerous part within an enclosure

8. Third Column A The back of the hand is protected against touching dangerous parts within an enclosure B A finger (12mm x 80mm) is protected against touching dangerous parts C A tool (2.5mm x 10mm) is protected against touching dangerous parts D A piece of wire (1.00mm2 x 100mm) is protected against touching live parts

9. Examples IP2X Full penetration of 12.5mm dia sphere not allowed and protection against finger (12mm x 80mm) IPXXB Protection against finger contact only i.e (12mm x 80mm) IP4X Protection against solid objects (tools, wires 1.00mm dia) IPX8 Indefinite immersion shall not allow water to enter the enclosure i.e submersion

10. Information Required for Initial Verification 711-01-02 Maximum Demand of the installation Number and type of live conductors Type of Earthing arrangements Nominal Voltage The nature of the current and the frequency Prospective fault current at the origin External phase to earth loop impedance Ze Suitability of the supply for the installation Type and nominal rating of the overcurrent device at the origin

11. Diagrams, charts or tables providing adequate information relating to the type and composition of each circuit including points served, type of wiring and the number and size of the circuit conductors Information regarding the identification and location of isolation and switching devices Identification of any circuit and/or equipment liable to damage by a typical test Identification of the method used for and means of compliance with Reg 413-02-04

12. Inspection 712-01-01 Inspection shall precede testing and shall normally be done with that part of the installation under inspection disconnected from the supply

13. Inspection 712-01-02 The inspection shall be made to verify that the installed electrical equipment is: In compliance with Section 511 (this may be ascertained by mark or by certification furnished by the installer or by the manufacturer), and Correctly selected and erected in accordance with the Regulations, and Not visibly damaged or defective so as to impair safety

14. Inspection Checklist 712-01-03 Connection of conductors Identification of conductors Routing of cables in safe zones or protection against mechanical damage, in compliance with Section 522 Selection of conductors for current-carrying capacity and voltage drop, in accordance with the design Connection of single pole devices for protection or switching in phase conductors only

15. Correct connection of accessories and equipment Presence of fire barriers, suitable seals and protection against thermal effects Methods of protection against electric shock (a)protection against both direct and indirect contact, i.e SELV or limitation of energy (b)protection against direct contact: protection by insulation of live parts protection by a barrier or an enclosure protection by obstacles protection by placing out of reach protection by PELV

16. (c) protection against indirect contact: Earthed Equipotential Bonding and Automatic Disconnection of Supply presence of earthing conductors presence of protective conductors presence of main equipotential bonding conductors presence of supplementary equipotential bonding conductors presence of earthing arrangements for combined protective and functional purposes

17. Use of Class II equipment or equivalent insulation Non-conducting locations absence of protective conductors Earth free-local equipotential bonding presence of earth-free equipotential bonding conductors Electrical separation

18. Prevention of mutual detrimental influences Presence of appropriate devices for isolation and switching correctly located Presence of undervoltage protective devices Choice and setting of protective and monitoring devices (indirect contact and/or overcurrent) Labelling of protective devices, switches and terminals Selection of equipment and protective measures appropriate to external influences

19. Adequacy of access to switchgear and equipment Presence of danger notices and other warning signs Presence of diagrams, instructions and similar information Erection methods

20. Conduit Fixings (correct number and type of saddle) Ends of tube reamed Couplings tightened Running couplings locknuts tightened Box lids fitted complete with screws Vice marks removed Damaged finishes restored External protective conductors installed

21. (1)Regarding the Initial verification of a NEW installationState the documentation that:(a) Should be available(b) Will need to be completed (a) Charts / diagrams or similar information regarding the type of circuit, the number of points served, type of wiring and conductor size etc. b) i)Inspection schedule ii)Test results schedule iii)Electrical installation certificate

22. (2) State;(a) TWO statutory documents that have a direct influence upon inspection and testing(b) The legal status of HSE GS38 document on electrical test equipment for electricians (a) Health and Safety at Work Act and the Electricity at Work Regulations (b) This is a Guidance note and therefore cannot be statutory i.e Non-Statutory

23. (3) State THREE methods of protection against direct contact There are FOUR methods of protection against direct contact stated in BS7671 Insulation of LIVE parts Barriers or Enclosures Use of Obstacles Placing out of reach Any three of these would be acceptable

25. (5) State THREE methods of protection against indirect contact There are FIVE methods of protection against indirect contact listed in BS7671 EEBADS (Earthed Equipotential Bonding and Automatic Disconnection of Supply) Protection by Class II Equipment Protection by non-conducting location Protection by earth-free local equipotential bonding Protection by electrical separation Any three will be acceptable

26. (6) With reference to the Electricity at Work Regulations State:-(a) Title of the person who has control of an electrical installation(b) Status of the person identified above(c) Responsibilities of this person when carrying out the inspection and testing Duty Holder Competent Carry out the work safely, no danger or injury to persons or livestock and no damage to equipment