to the 16th Edition IEE Regulations
   
   
   
 
 

chapter 5
Earthing

chapter 6
Circuits

Inspection and Testing
  8.1 - Introduction 8.5 - Insulation tests
  8.2 - Inspection 8.6 - Earth testing
  8.3 - Testing sequence 8.7 - Test instrument requirements
8.4 - Continuity tests 8.8 - Supporting paperwork


8.2.2 - Inspection

Before testing begins it is important that a full inspection of the complete installation is carried out with the supply disconnected. The word 'inspection' has replaced 'visual inspection', indicating that all the senses (touch, hearing and smell, as well as sight) must be used. The main purpose of the inspection is to confirm that the equipment and materials installed:

1. - are not obviously damaged or defective so that safety is reduced

2. - have been correctly selected and erected

3. - comply with the applicable British Standard or the acceptable equivalent

4. - are suitable for the prevailing environmental conditions

An inspection checklist is shown in Table 8.3. Some inspections are best carried out whilst the work is in progress. A good example is the presence of fire barriers within trunking or around conduit where they pass through walls.

 

Table 8.3 - Inspection check list
1
Identification of conductors
2
Mechanical protection for cables, or routing in safe zones
3
Connection of conductors
4
Correct connection of lampholders, socket outlets, etc.
5
Connection of single-pole switches in phase conductors only
6
Checking of design calculations to ensure that correct live and protective conductors have been selected in terms of their current-carrying capacity and volt drop
7
Presence of fire barriers, suitable seals and protection against fire
8
Protection of live parts by insulation to prevent direct contact
9
Protection against indirect contact by the use of:-
------a) - protective conductors
------b) - earthing conductors
------c) - main and supplementary equipotential bonding conductors
10
Prevention of mutual detrimental influence
11
Electrical separation
12
Undervoltage protective devices
13
Use of Class II equipment
14
Labelling of fuses, circuit breakers, switches and terminals
15
The settings and ratings of devices for protection against indirect contact and against overcurrent
16
The presence of diagrams, instructions, notices, warnings, etc.
17
Selection of protective measures and equipment in the light of the external influences involved

 

 

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Extracted from The Electricians Guide Fifth Edition
by John Whitfield
Published by EPA Press Click Here to order your Copy

Click here for list of abbreviations