Practical Guide to Inspection, Testing and Certification of Electrical Installations


Practical Guide to Inspection, Testing and Certification of Electrical Installations


Practical Guide to Inspection, Testing and Certification of Electrical Installations

    Part P of the Building Regulations came into effect on the 1st of January 2005. This part of the Building Regulations requires that all electrical work carried out in domestic installations now has to be certificated. For work places, the Electricity at Work Regulations 1989 require that they provide a safe and well maintained electrical system. Certification and well kept records are a perfect way to confirm that every effort has been made to ensure that the system is, and remains safe.


    I have written this book to assist electricians of all levels in carrying out the inspecting, testing and certification of all types of electrical installations. It will also be invaluable to City and Guilds 2330 level 2 and 3 students, electricians studying for City and Guilds 2391 parts 101 and 102 and all tradesmen who are required to comply with Building Regulation part P. Step by step guidance and advice is given on how to carry out a detailed visual inspection during initial verifications, periodic inspections and certification.

    Text and colour photographs of real, not simulated installations, are used to show the correct test instruments. Step by step instructions for how to carry out each test safely using different types of instruments are given along with an explanation as to why the tests are required. In some photographs safety signs have been omitted for clarity. All test leads are to GS 38 where required. Some comments within this book are my own view and have been included to add a common sense approach to inspecting and testing.


Table Of Contents

1. Inspection and testing of electrical installations

Why inspect and test? 

Section 1. Design, Installation, Inspection and Testing 

Section 2. Extensions, Material alterations and material changes of use 

Section 3. Information about other legislation 

Compliance with Building Regulations Part P 

Earthing and bonding to comply with Part P 

Registered domestic installer

Unregistered competent person 

DIY installer 

2. Types of certification required for inspecting and testing of installations

Certification required for domestic installations (Part P) 

Minor Electrical Installation Works Certificate 

Part P, Domestic Electrical Installation Certificate 

Periodic inspection, testing and reporting 

Certification required for the inspecting and testing of installations other than domestic 

Minor Electrical Installation Works Certificate

Electrical Installation Certificate

Initial verification inspection 

Initial verification testing 

Periodic inspection report

Periodic inspection 

Three phase circuit/systems 

Periodic testing 

Voltage drop in conductors 

3. Testing of electrical installations

Safe isolation

Testing for continuity of protective conductors

Ring final circuit test

Insulation resistance test

Testing of site applied insulation

Polarity tests

Earth electrode testing

Earth fault loop impedance Ze

Circuit earth fault loop impedance

Prospective fault current test

Functional testing

4. Completion of test certificates 

Minor Electrical Installation Works Certificate 

Electrical Installation Certificate 

Schedule of Circuit Details and Test Results 

Schedule of Items Inspected 

Method of protection against electric shock 

Cables and conductors 


Periodic Inspection Report 

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