Periodic Electrical Inspection: Importance, Procedure, and Cost

Periodic Electrical Inspection – Electrical installations in buildings are crucial for their proper functioning. They need to be maintained and inspected regularly to ensure they are safe and reliable. Periodic Electrical Inspection (PEI) is one such crucial process that involves inspecting and testing electrical installations and systems to ensure they meet the necessary safety standards. This article will discuss the importance, procedure, and cost of PEI.

Importance of PEI

Periodic Electrical

Ensures Electrical Safety Periodic Electrical Inspection

The foremost importance of PEI is to ensure electrical safety. Electrical installations deteriorate over time due to wear and tear, environmental factors, and usage. A PEI ensures that these installations and systems are in good condition and pose no harm to the occupants.

Prevents Electrical Accidents

PEI helps in preventing electrical accidents such as electric shocks, fires, and explosions. Faulty electrical installations can lead to such accidents, and a PEI can detect these faults beforehand, allowing for timely repairs and maintenance.

Complies with Regulations

PEI is mandatory in many countries and is required by law. Compliance with these regulations is essential for businesses, landlords, and homeowners to avoid penalties and legal repercussions.

When Should PEI be Conducted?

Periodic Electrical Inspection

PEI should be conducted periodically, depending on the type of installation and usage. For example, commercial installations require more frequent PEI than residential installations due to their complex systems and high usage. The following are some of the recommended intervals for PEI:

  • Domestic Installations: 10 years or change of occupancy
  • Commercial Installations: 5 years
  • Industrial Installations: 3 years
  • Buildings open to the public: 1 year

PEI Procedure Periodic Electrical

PEI consists of two main parts: visual inspection and testing.

Visual Inspection

The visual inspection involves examining the electrical installations for visible signs of damage, wear, and tear. The inspector checks for the following:

  • Signs of overheating or burning
  • Signs of corrosion or damage to the cables
  • The presence of combustible materials near the installations
  • Compliance with safety regulations


After the visual inspection, testing is conducted to ensure the installations meet the safety standards. The following tests are performed:

Earth Continuity

This test checks if the earth connection is intact and has low impedance. It ensures that any fault in the electrical system is detected and the RCD trips off, preventing any harm to the occupants.

Insulation Resistance

This test checks if the insulation of the electrical system is in good condition. It ensures that the electrical system does not leak current and cause harm to the occupants.


This test checks the polarity of the electrical system to ensure that the current flows in the correct direction. Incorrect polarity can cause damage to the electrical system