Inspection and Testing


Electrical Inspection and Testing is an integral part of MMS Electricals comprehensive safety programmes. Our team of testing engineers have a wealth of experience in this field, helping companies both large and small to conform to the '17th Edition Wiring Regulations', and therefore comply with the 'Electricity at Work Regulations (EaWR) 1989'. Whether providing site surveys, technical advice, producing fixed wiring drawings or undertaking extensive testing programmes, we are confident of our ability to deliver the highest possible standards of quality and service.


MMS Electrical is committed to providing expert advice and guidance on electrical safety matters. If you would like to contact us or request a FREE Site Survey then please click here.


What is Periodic Inspection & Testing?


The 'Electricity at Work Regulations 1989' in Regulations 4(1) and 4(2) lay down the requirement to ensure that an electrical installation should be designed, installed, constructed and maintained in a safe manner at all times. The basis for periodic inspection and testing is derived from Guidance Note 3 of the 'IEE Wiring Regulations BS7671:2008'.

Inspection & Testing of an electrical installation generates a Periodic Inspection Report which is a condition report supplemented by testing results. The Periodic Inspection Report will normally consist of:


  • Client information and details of the installation
  • Supply characteristics and Earthing arrangements
  • Observation & Recommendations
  • Extent & Limitations of Testing
  • Summary of the Inspection
  • Inspection & Test Schedules


The Inspection of an electrical installation should be carried out in accordance with 712-01-03 of the 'IEE Inspection and Testing Guidance Note 3'. Conducted by a team of two competent qualified inspectors, the Inspection can highlight a significant percentage of defects on an electrical system. These may include (amongst others): exposed conductors or terminations: broken covers, conduits or trunking: the lack of earthing on conductive parts and inadequate support or damage to cables.


The Testing of an electrical installation follows BS7671:2008 and comprises of:

  • C.P.C Continuity
  • Ring Circuit Continuity
  • Insulation Resistance
  • Polarity
  • Earth Fault Loop Impedance
  • Prospective Fault Current
  • Operation of Residual Current Devices
  • Functional Testing