Question 1

What are low-voltage switchgear (LV switchgear) and what are they used for?

Accepted Answer

Low-voltage switchgear (LV switchgear) are electrical distribution and control units used in low-voltage networks to distribute and control electrical energy to various loads. They are used in a variety of applications, including residential buildings, commercial facilities and industrial plants, to ensure the safe and efficient operation of electrical systems.

Question 2

What components are included in a typical low-voltage switchgear?

Accepted Answer

A typical low-voltage switchgear contains components such as circuit breakers, contactors, fuses, relays, terminal blocks, measuring and monitoring devices as well as control and automation components. These components work together to control the flow of electricity, provide protective functions and monitor power distribution.

Question 3

What maintenance and inspection intervals are prescribed or recommended for low-voltage switchgear?

Accepted Answer

The following maintenance and inspection intervals apply to low-voltage switchgear:

Regular visual inspection: A monthly to quarterly inspection is recommended, during which visible damage and anomalies are identified.
Annual functional test: The protective mechanisms such as residual current circuit breakers and overload protection should be checked at least once a year.
Insulation measurements: These should be carried out every three to five years to ensure the integrity of the insulation.
Thermographic inspections: These can be done annually to detect hotspots and overheating at an early stage.
VDE inspections: A comprehensive VDE test in accordance with DIN VDE 0105-100 is recommended every four years to ensure the safety and functionality of the system.

Question 4

Which standards and regulations apply to the construction and operation of low-voltage switchgear?

Accepted Answer

International and national standards apply to the construction and operation of low-voltage switchgear and controlgear assemblies, in particular IEC 61439, which specifies requirements for the design, testing and certification of low-voltage switchgear and controlgear assemblies. These standards ensure that the systems operate safely, reliably and efficiently and meet all relevant safety requirements.

Question 5

What types of protection and protective measures are common for low-voltage switchgear?

Accepted Answer

Typical types of protection and protective measures for low-voltage switchgear are:

Protection against overload and short circuit: Use of fuses, circuit breakers and circuit breakers.
Residual current protection: Use of residual current circuit breakers (RCDs) to detect and switch off residual currents.
Protection against contact: Insulation, covers and switch cabinets with protection classes such as IP20 to IP65, depending on requirements.
Lightning protection and overvoltage protection: Use of overvoltage protection devices to protect the system from transient overvoltages.
Fire protection: Integration of fire protection switches and suitable materials to minimize damage in the event of a fire.

Question 6

What factors influence the service life of a low-voltage switchgear?

Accepted Answer

The service life of a low-voltage switchgear is influenced by various factors. These include the quality of the components used, the load on the system, environmental conditions such as temperature and humidity, as well as maintenance practices. Regular maintenance can significantly extend the service life by detecting and rectifying signs of wear at an early stage. The correct dimensioning of the system to avoid overloading also plays an important role. Finally, the way in which the system is operated, for example by avoiding switching operations under load, can also influence the service life.

Question 7

What are the challenges involved in planning and installing low-voltage switchgear?

Accepted Answer

There are several challenges when planning and installing low-voltage switchgear, such as the correct dimensioning of components, compliance with applicable standards and regulations, integration into existing electrical systems and consideration of environmental conditions. In addition, space and cost efficiency, safety aspects and the ease of maintenance of the system must be taken into account.

Question 8

How do low-voltage switchgear systems contribute to energy efficiency and operational safety?

Accepted Answer

Low-voltage switchgear contributes to energy efficiency by optimizing power consumption through precise control and monitoring and increasing operational safety by providing protective functions such as overload and short-circuit protection. By using modern control and monitoring technologies, energy losses can be minimized, the service life of electrical systems extended and the risk of breakdowns or accidents reduced.

ESI series/ESO series
Definition of	Mechanical system	Sheet metal options	Sheet thickness	Paintwork options	Lock systems	IP code
Equipped internal equipment panels	Standard	Galvanized	2 mm	Standard RAL 7035	3 point	IP 2X
			3 mm	Other options
Technical details
Scaffolding	Gate	Base	Roof	Back covers	Mounting plate	Cover plate
2 mm	2 mm	2 mm	2 mm		1.5 mm	1.5 mm
	3 mm	3 mm	3 mm		2 mm	2 mm
Types of panels depending on the intended use
TEDAŞ TYPE PLATES	Partial panel types
Internal type Ag (low voltage)	KRP-Platten (34,5kv/154kv/380kv)
Distribution boards (50-1600 Kva)	KP disconnection points (34.5kv/154kv/380kv)
	Meter boards (4-6-8)
	OG switchboards
	Communication boards conductor rail
	Protective plates
	DC distribution cabinets
	AC distribution cabinets

Low-voltage switchgear

We plan and implement switchgear for low voltage