Periodic Inspections

What is a Periodic Inspection?

It is an inspection on the condition of an existing electrical installation, in order to identify and prioritise faults and deficiencies that do not comply with BS 7671 national safety standards.

Why do I need a Periodic Inspection?

Electrical installations deteriorate over time and with usage, and it is the responsibility of the accountable person to ensure that the installation is in a safe and operational condition and that the safety of users is not put at risk.

A rental domestic property should be inspected every 5 years and/or when a change in occupancy occurs, as a legal duty of care, to ensure the correct operation between tenants is taken, and that no changes have occurred without prior knowledge.

An Industrial site, with a higher probability of deterioration requires an Inspection every 3 years.

What happens during a Periodic Inspection?

The scope of work is to give a professional opinion of the condition of the installation through a visual inspection and instrument test of those parts which are accessible. CEC Electric offers a Free Visual Inspection as standard, and takes into account the following;

  • Adequacy of earthing and bonding
  • Suitability of the switchgear and controlgear
  • Serviceability of equipment
  • Condition and type of wiring system
  • Provision of residual current devices for socket-outlets that may be used to plug in electrical equipment used outdoors
  • Presence of adequate identification and notices
  • Extent of any wear and tear, damage or other deterioration
  • Changes in use of the premises which have to led to, or might lead to, deficiencies in the installation

The Periodic Inspection is inclusive of a Visual Inspection, but also requires the following to generate a PIR Periodic Inspection Report;

  • Visual Inspection
  • Ring Circuit Continuity
  • Protective conductors continuity test
  • Characteristics of supply at origin of installation
  • Insulation resistance test
  • Polarity check
  • Earth electrode resistance
  • Earth fault loop impedance test
  • Operation of residual current devices
  • Prospective fault current

What is the purpose of a (PIR) Periodic Inspection Report?

The PIR records the findings of the Periodic Inspection and reports on the safety condition of the existing installation. It will describe the overall condition as either ‘satisfactory’, whereby no remedial works are necessary, or ‘unsatisfactory’ where remedial works are essential to ensure the installation is safe to use.

If the PIR classifies the installation as ‘unsatisfactory’, then the urgency of action required is classified under ‘Observations and Recommendations’ and coded from 1-3, with 1 being the most serious.

When is a Periodic Inspection required?

It is recommended that Inspection & Testing is carried out at least every 5 years for Commercial properties and 10 years for Domestic properties.

Recommended Fixed Wiring/Periodic Inspections & Testing

Type of Installation Mazimum period between Testing / Inspections
Commercial change of occupancy / 5 years
Educational establishments 5 years
Industrial 3 years
Residential accommodation change of occupancy / 5 years
Offices 5 years
Shops 5 years
Laboratories 5 years
Church installations 5 years
Leisure complex (no pools) 3 years
Restaurants/ Hotels 5 years
Theatres 3 years
Public houses / Bars 5 years
Village hall / centres 5 years
Caravans 3 years
Caravan Parks 1 year
Swimming pools 1 year
Emergency Lighting 3 years
Fire Alarms 1 year
Construction sites 3 months



CEC Electric - Expert Electrical Service as Standard
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