Introduction

In the fourth part of the series "How do you connect" I would treat the topic of cables used in LV.
The purpose is not to enter on the sizing but to give an overview to the topic.

cable designation codes

Designation system with CEI 20-27

This designation system has as reference to CEI 20-27.
Conductor cross section, number of core and the presence of the protective conductor are placed at the end .

Examining a common cable the N07V-K 2,5.
Single core cable cross section 2,5mm²

N Not suit tu IEC standard
07 Rated voltage U0/U 450/750V
V PVC compound
K Flexible conductor

From this example it will be much easier to understand the following table

These tables explain individual initials divided by category

Reference standards

Rated voltage

Sheath isulating material

Metalling covering (when present)

Sheath (When present)

Special design (When present))

Conductor

Conductor Cross section and protective core

Coductor cross section, number of the cores and the presence of the protective core is indicated:

Example 3G2,5 Three conductor cable, cross section 2,5 mm² with yellow-green core
Example 4x2,5 Four conductor cable, cross section 2,5 mm² without yellow-green core

Designation system with CEI-UNEL 35011

This designation system has as reference to CEI-UNEL 35011.

Conductor cross section, number of core and the presence of the protective conductor are placed at the end .

Examining a common cable FG7OR:
5G10 FG7OR 0,6/1 kV
5G10 Five conductor cable (cross section 10mmq,high module rubber (HEPR)
O Assembled cores in round cable
R PVC compound
0,6/1 kV Rated voltage 0,6/1 kV

These tables explain individual initials divided by category

Conductor

Isulation

Cable shape

Screen(When present)

Armour (when present)

Sheath (when present)

Rated voltage

Mark of quality IMQ - HAR

the IMQ(IEMMEQU) or the mark HAR (harmonized type cables) can be printed on the sheath or on the insulation or on textile yarn.

Sorgente FidoCadJ | Ingrandisci | Cos'è Fidocad

Commercial cross sections of energy cables

The table is in mm²

Reference standards

Primary reference standards refer to the CEI CT 20 Technical Committee.

In this article were treated parts of CEI 20-27 and CEI-UNEL 35011