Question 1

Which standards and regulations must be observed when planning and installing main electrical distribution cabinets?

Accepted Answer

The planning and installation of electrical main distribution cabinets is subject to a large number of standards and regulations that must be complied with. These include, above all, DIN VDE 0100, which sets out general requirements for electrical systems. Other important standards are DIN EN 61439, which sets out specific requirements for switchgear and distribution boards, and DIN EN 60204, which describes safety requirements for machinery. Local building regulations and the specifications of the grid operator must also be observed. These regulations are not only intended to ensure the safe operation of the electrical system, but also to protect people and property.

Question 2

What types of protection (IP protection classes) are there for electrical main distribution enclosures and when are they used?

Accepted Answer

The degree of protection of a main distribution enclosure is defined by the IP protection class, which is described in the DIN EN 60529 standard. It indicates how well the enclosure is protected against the ingress of foreign bodies and water. Common protection classes are:

IP20: Protection against solid foreign bodies with a diameter of 12.5 mm or more, but no protection against water. This type of protection is used in dry, clean indoor areas.
IP54: Protection against dust deposits inside and splashing water on all sides. Often used in industrial environments with increased dust exposure or humidity.
IP65: Complete protection against dust ingress and protection against water jets from any angle. This protection class is suitable for outdoor areas or particularly harsh industrial environments.
IP67: Protection against dust ingress and protection against temporary immersion in water. Suitable for applications where the enclosure may be temporarily immersed in water.

Question 3

What role does heat dissipation play in electrical main distribution enclosures and how can it be ensured?

Accepted Answer

Heat dissipation is a critical factor for the reliable operation of main electrical distribution cabinets. If the components installed in the cabinet, such as switches, transformers and control units, generate heat, this must be dissipated effectively to prevent overheating and associated failure or damage. Heat dissipation can be ensured by natural convection, where the warm air rises and escapes through ventilation slots, or by forced ventilation using fans. In particularly demanding environments, active cooling, e.g. using air conditioning units or heat exchangers, may also be necessary. In addition, the components should be arranged in the cabinet in such a way that the heat development is distributed as evenly as possible and no hotspots occur.

Question 4

How is the selection of the correct size and capacity of a main electrical distribution board determined?

Accepted Answer

Several factors must be taken into account when selecting the right size and capacity of a main distribution cabinet:

Electrical load: The total power that the installation must handle determines the size of the main fuses and therefore the size of the distribution board.
Number of circuits: The number of circuits required will affect the number of fuses needed and the amount of space required.
Future expandability: Some reserve capacity should always be planned to allow for future expansions or changes to the system.
Ambient conditions: Space for cooling and adequate ventilation can increase the space required in the cabinet.
Space conditions: Available space on site and possible access restrictions must also be considered.

Question 5

What safety measures must be observed when working on an electrical main distribution board?

Accepted Answer

When working on an electrical main distribution board, strict safety measures must be observed to prevent accidents and electric shocks. These include:

Disconnecting the system: The entire system must be de-energized before starting work. This is ensured by disconnecting, securing against reconnection, checking that there is no voltage and earthing.
Personal protective equipment (PPE): Electricians must wear suitable protective equipment such as insulating gloves, safety goggles and protective work clothing.
Permission to work: Before starting work, approval must be given by the responsible electrician.
Signage and barriers: The work area must be clearly marked and, if necessary, cordoned off to prevent unauthorized access.
Maintaining clearances: Sufficient clearances must be maintained from live parts to minimize the risk of electric shock.

EBO-SERIES
DEFINITION	MECHANICAL SYSTEM	SHEET METAL OPTION	BLECHDICKE	COLOR OPTION	LOCK SYSTEM	IP CODE
EQUIPPED INTERNAL MOUNTING PLATES	STANDARD	GALVANIZED	0.8 mm	STANDARD	1 POINT	IP 44
		DKP	1 mm	RAL 7035	2 POINT
			1.2 mm	OTHER OPTIONS
			1.5 mm
			2 mmm
TECHNICAL DETAILS
SCAFFOLD	COVER	ASSEMBLY PLATE	COVER SHEET
0.8-1.5 mm	1-1.5 mm	0.8 mm	0.8-1.2 mm
Between the values	Between the values	1 mm	Between Values
TYPES OF PLATES DEPENDING ON THE INTENDED USE
POWER DISTRIBUTION CABINETS	COUNTERPANELS	Coffra boxes
	SINGLE-PHASE METER PANEL
	THREE-PHASE METER BOARD

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Main distribution cabinets in our range:

Technical data of the EBO series

Outer box

External surface-mounted meter panel for single-phase operation

External surface-mounted meter panel for three-phase operation

External surface-mounted power distributor

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