Cable Identification: Designation, Coding, and Decoding

Introduction and Importance of Cable Abbreviations

Electrical cable abbreviations present technical information—such as conductor material, insulation type, and electrical characteristics—in a coded format. These codes are defined by standards like VDE (Germany) or IEC (international), which are also commonly used in Iran.

The naming convention is usually read from left to right: first the conductor material (such as N for copper or NA for aluminum), then the insulation type (such as Y for PVC), followed by other features like shielding, armoring, or sheath.

The meanings of these codes can be complex, but learning them helps in selecting the appropriate cable for different applications. For example, aluminum cables—such as those produced by Sim Rad—are often identified with codes like NA or ACSR.

Research shows that a significant portion of electrical problems and accidents result from misreading these codes and choosing the wrong cable. Therefore, it is recommended to rely on reputable sources and well-known Iranian manufacturers.

This topic is less controversial, but the choice between copper and aluminum (with aluminum being cheaper but having different electrical resistance) can be debated. Evidence suggests that aluminum, when the correct cross-sectional area is selected, is an excellent option—especially for overhead lines and power distribution cables.

Introduction to Standards

The abbreviations used on electrical cables are not only the product’s technical identity but also a guarantee of safety and efficiency in electrical systems. At Sim Rad Company, these codes are applied in accordance with national standards (ISIRI) and international standards (IEC, VDE).

Naming Standards

In Iran, cable naming conventions largely follow the VDE system, which uses Latin letters to describe technical characteristics.

Global standards such as IEC 60228 (for conductors) and the DIN VDE 0276 series (for power cables) form the foundation of this system. (It should be noted that the older VDE 0295 standard has today been largely harmonized with the newer IEC standards.)

In Iran, the Institute of Standards and Industrial Research of Iran (ISIRI) has localized these standards; for example, ISIRI 3569 is the main reference standard for low- and medium-voltage power cables.

How Cables are Named

Cable naming is done based on a systematic pattern and is usually read from left to right:
First Letter: Conductor material (N for copper according to VDE standard, and NA for aluminum).
Second Letter: Insulation type (Y for PVC, 2X for XLPE or Cross-linked Polyethylene).
Subsequent Letters: Structural features such as Shield (S), Concentric Conductor (C), Armor (F, R, or B), and the type of final sheath.
For example, in the code “NYY”, the letter N indicates a standard cable (copper conductor), the first Y is PVC insulation, and the second Y is the final PVC sheath.
In Sim Rod aluminum wire products, the code NA is common because the focus is on aluminum.

Table of Some Common Abbreviations (Based on VDE System)

Abbreviation	Code Meaning	Example Application
N	Standard Cable (Copper Conductor)	General power cables
NA	Aluminum Conductor	Aluminum underground or overhead cables
Y	PVC Insulation or Sheath	General and building cables
2Y	Polyethylene (PE) Insulation	Telecommunication or special cables
2X	XLPE Insulation	Medium voltage and industrial low voltage cables
C	Concentric Conductor	Distribution and lighting cables
S	Copper Shield (Screen)	Medium Voltage (MV) cables
B	Steel Tape Armour	Buried cables (mechanical protection)
F	Flat Steel Wire Armour	Industrial and armored cables
R	Round Steel Wire Armour	Cables with high mechanical tension

Meaning of Codes and Specific Abbreviations

Each code has a specific meaning that reveals technical details. For instance:
ACSR/AW: Aluminum wire with a steel core and aluminum cladding (Alumoweld), ideal for overhead lines requiring high mechanical strength and corrosion resistance.
CCT: Thick coated medium voltage overhead conductors.
In addition to letters, codes also include numbers: for example, “3×25” means three conductor strands with a cross-section of 25 square millimeters.
Rated voltage is also specified, such as 0.6/1 kV for low voltage.

How to Read Power Cable Specifications

Reading specifications starts from the cable core:
1. Check the conductor material (N or NA).
2. Read the insulation type and intermediate components (Shield/Armor).
3. See the number of strands and cross-section.
Detailed Example:

- Cable “NA2XSY 1×185”:
  - NA: Aluminum conductor
  - 2X: XLPE insulation (Cross-linked Polyethylene)
  - S: Copper Screen – Note: Here S does not mean armor, but electrostatic shield.
  - Y: Final PVC sheath
- This is a single-core medium voltage cable widely used in distribution networks.

Armored Cable Example:

- Cable “NYBY”: Copper conductor (N), PVC insulation (Y), Steel tape armor (B), Final PVC sheath (Y).
- This cable is suitable for direct burial in soil.

Difference Between VDE, IEC, and ISIRI Standards

VDE Standard (Germany): Focuses on layered structure (like NYY). This system is very well-established in the Iranian market.
IEC Standard (International): Focuses more on performance and materials and may name cables descriptively (e.g., Cu/XLPE/PVC).
ISIRI Standard (Iran): These standards are usually translated and localized versions of IEC standards.
- For example, ISIRI 607 for building wires and cables (similar to IEC 60227)
- And ISIRI 3569 for power cables (similar to IEC 60502).

Standards Comparison Table:

Standard	Main Focus	Example Code/Naming	Application in Iran
VDE	Structural Letter Coding	“NYY, NA2XSY”	Very common in the market and among engineers
IEC	Performance and Technical Specs	60502-1 (Cable Type)	Main reference for national standards
ISIRI	IEC Localization	ISIRI 3569-1	Legal requirement for reputable manufacturers

Advanced Abbreviations and Fire Resistant Codes

In addition to basic codes, abbreviations related to cable behavior in fire are also important.
It should be noted that FR (Flame Retardant) or LSZH (Low Smoke Zero Halogen) codes are more common in commercial naming systems or those based on IEC/BS standards.
In the VDE system, the following codes are usually used:
- H: Halogen-Free polymeric materials.
- HX: Halogen-free and resistant insulation or sheath.
Therefore, a cable that might be called LSZH in IEC, might be known by codes like NHXMH in the VDE system.

Common Mistakes in Reading Codes and Solutions

Mistaking N and NA: Failing to notice the letter A leads to buying copper cable instead of aluminum (or vice versa), which have a drastic difference in price and required cross-section.
Misinterpreting Letter S: In medium voltage (MV) cables, the letter S indicates a Copper Shield, not steel armor.
Armor is usually indicated by B, F, or R.
Mistaking these two can lead to purchasing a cable that lacks the necessary mechanical protection.
Ignoring Voltage: Using a 0.6/1kV cable (low voltage) in a 20kV network (medium voltage) carries a deadly risk.
Solution: Always check the code completely and in case of doubt, refer to the manufacturer’s “Data Sheet”.

Buying and Maintenance Tips

When buying, check for the ISIRI standard mark and the accompanying 10-digit code.
Also, ensure that aluminum cables (NA) are made from standard alloys with high purity so that they do not face problems in connections.
In Sim Rod company products, all these standards are observed, and the coding is exactly in accordance with international and national references.

Conclusion

Understanding cable abbreviations is key to safety and efficiency.
By learning the difference between codes like S (Shield) and B (Armor) and recognizing reputable standards like ISIRI 3569, you can make a secure and engineered purchase.