What is grounding measurement?

 

It shows how well the electrical installation is connected to the ground.

 

The result is expressed in ohms (Ω).

 

The lower the value, the better the grounding.

 

Generally accepted limits (may vary depending on the application):

 

Residential: generally ≤ 5 Ω

 

Industrial / sensitive systems: 1–2 Ω or lower is desired

 

Why is it done?

 

To prevent electric shock

 

To ensure the correct operation of fuses and residual current devices

 

To reduce fire and equipment damage

 

To check compliance with legal/technical regulations

 

How is it done?

 

Regulations on Grounding in Electrical Installations

 

This is the most basic and mandatory regulation.

 

Defines measurement methods

 

Specifies acceptable resistance values

 

Requires periodic measurements

 

TS HD 60364-6

 

Low Voltage Electrical Installations – Part 6: Verification

 

Explains how the installation should be checked before commissioning and during use

 

Grounding continuity and resistance measurements are included in this standard

 

Widely used in residential and commercial buildings

 

TS EN 62305

 

Lightning Protection Systems

 

Used for lightning protection grounding

 

Lightning rod and equipotential grounding measurements are performed according to this standard

 

Particularly important for high-rise buildings and industrial facilities

 

1️⃣ With a special measuring device

 

A device called a grounding meter (megger) is used.

 

Measurements are taken through auxiliary electrodes placed in the ground.

 

This is the most reliable and standard method.

 

2️⃣ Measurement from the Socket (for inspection purposes)

 

Some test devices are used to check if there is a ground wire in the socket.

 

This method does not give an exact resistance value, it only provides an idea.

 

Generally Accepted Resistance Values ​​According to Standards

 

Values ​​vary depending on the application:

 

Residential and small businesses: ≤ 5 Ω

 

Industrial facilities: ≤ 2 Ω

 

Lightning protection: ≤ 10 Ω (lower values ​​may be required in some cases)

 

Sensitive electronic systems: ≤ 1 Ω

 

When should the measurement be taken?

 

When a new building or installation is constructed

 

After changes to the electrical installation

 

After events such as lightning strikes

 

As part of periodic inspections (generally once a year)

 

Who should perform it?

 

It should be performed by Electrical Engineers, Electrical and Electronics Engineers / Electrical Technicians.

 

The Periodic Inspection Specialist must have an Ekipnet "K" number and the ISG-Katip contract must not be forgotten before the inspections.