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Low Voltage Electrical Cables



In this blog post, we are going to explain the methods of naming power cables, designated voltage cables up to 0.6 / 1 VK; we will see the different types that are most common in Spain. All the different UNE standards published by the Spanish Association for Standardization and Certification (AENOR), are available to any user, but here we remember with this post so that it can be consulted and informed at any time.

Our intention is not to replace the UNE standards; if you have any further questions or to investigate more about the subject of a power cable, we advise you to consult the appropriate UNE standard for each variety.

Electric cables with established voltage up to 450/750 V.

The UNE 20434 standard (Rule for the naming of insulated cables) is in charge of defining, according to its specifications, the name of electrical cables up to 450 / 750v. This standard applies to all countries of the European Union. (CENELEC Joint Document HD 361).

The rule used is a succession of symbols in which each of them, according to its position, has a previously established meaning in the said rule. Clarification: As the cables with the rated voltage 0.6 / 1 kV are not arranged, this naming system does not apply.

There are inconsistencies and disagreements between both naming systems since the same symbol can have different meanings depending on whether it is a cable with a voltage of up to 450/750 V or a cable with a voltage of up to 0.6 / 1 kV. In the image below, all the symbols used in the designation of the edifying types of the most commonly used cables in Spain of the following UNE standards have been incorporated:

Electric cables with established voltage up to 0.6 / 1 kV.

Insulated electric cables with a designated voltage up to 0.6 / 1 kV do not have a naming system based on the UNE 20434 standard (CENELEC Harmonization Document HD 361) as they are not harmonized. 

There is no general designation standard for 0.6 / 1kv cables, but the procedure used is a succession of symbols in which each one of them, and according to their placement, has a representation previously established in the standard itself. We are going to put several examples that will clarify more about this. 

The electrical cable (H07ZZ-F) is also an energy cable according to harmonized standards (H) with a rated voltage 450/750 V (07), and its cross-linked mixture insulation (thermostable) has low emission of corrosive gases and fumes (Z), with the cover of the same type of material (Z) and flexible for mobile work (-F). With the following example, we can see that the type cable (H07V-R) is an electrical cable according to harmonized standards (H) of rated voltage 450/750 V (07) with the insulation of PVC (V) and its rigid conductor of various wires (-R).


We hope that this guide will be useful to you and will help you to know how to distinguish the nomenclature of the most used cables in our country. 

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