SIST EN 50525-2-72:2011

SIST EN 50525-2-72:2011 is the Slovenian adoption of EN 50525-2-72:2011, published by SIST/CENELEC for low-voltage energy cables. It specifies the construction, marking, dimensions and test requirements for thermoplastic PVC insulated flat divisible flexible cables, for indoor internal wiring or direct supply connection to luminaires.

What does SIST EN 50525-2-72:2011 specify?

SIST EN 50525-2-72:2011 covers thermoplastic (PVC) insulated flat divisible flexible cables with a rated voltage of 300/300 V and a maximum conductor operating temperature of 60 °C. The document is aimed at cable types used indoors, so it is relevant when selecting or verifying a cable for wiring inside equipment or for lighting connections.

The standard is organized as follows:

• Clause 1 - Scope
• Clause 2 - Normative references
• Clause 3 - Terms and definitions
• Clause 4 - Flexible cables H03VH7H-F
• Annex A - Tests for cables to EN 50525-2-72
• Annex B - General data

The standard is meant to be read with EN 50525-1, which gives the general requirements for this cable family.

What are the key requirements of SIST EN 50525-2-72:2011?

Cable type and construction

SIST EN 50525-2-72:2011 specifies one cable type, H03VH7H-F, and gives its construction in Clause 4. The conductor shall be class 5 to EN 60228, which means a flexible conductor construction suitable for cords and flexible cables.

The cable shall be two-core, 0,5 mm². In practice, that fixes the product form quite tightly, so a buyer or manufacturer can quickly tell whether a proposed cable matches the standard.

Insulation and divisibility

SIST EN 50525-2-72:2011 requires two PVC insulation layers to EN 50363-3, both Type TI 2. The inner layer is applied around each conductor, the cores are laid parallel, and the outer layer is applied around the cores in a contrasting colour.

The cable shall be divisible as shown in Figure 1. This matters because the cable is intended to be split where needed during installation, while still meeting the insulation and separation requirements after division.

Marking

SIST EN 50525-2-72:2011 requires the cable to be marked H03VH7H-F. Clause 4.1.4 also points back to Clause 6 of EN 50525-1 for the marking rules.

For users, this means the cable identification on the sheath or insulation is part of conformity, not just product branding.

Dimensional and electrical limits

SIST EN 50525-2-72:2011 ties the detailed dimensional limits to Table B.1 and the test requirements to Annex A. The insulation thickness, overall dimensions and insulation resistance are controlled there, and the insulation resistance is measured on a divided element of the cable with both insulation layers in place.

In practice, this tells manufacturers and test labs exactly which properties must be checked on the finished cable, including after the cores are separated.

Separation and fire performance

SIST EN 50525-2-72:2011 adds a separation requirement beyond EN 50525-1: after the separation test, the inner layer shall not be visible. Annex A also includes the test under fire conditions using EN 60332-1-2.

That means the cable has to keep its intended structure during handling and installation, and it must also meet a vertical flame propagation test.

What terms does SIST EN 50525-2-72:2011 define?

• H03VH7H-F - the CENELEC code used to identify the cable type covered by this standard.
• class 5 - the conductor class specified from EN 60228 for flexible conductors.
• PVC - the thermoplastic insulation material used for both insulation layers in this cable type.
• TI 2 - the PVC compound type specified from EN 50363-3 for the inner and outer insulation layers.
• divisible - the cable can be separated into its cores as shown in Figure 1.
• luminaires - lighting equipment that the cable may directly supply according to the scope.
• U0/U - the voltage notation used in the scope for the rated voltage of the cable.

Who uses SIST EN 50525-2-72:2011?

SIST EN 50525-2-72:2011 is used by cable manufacturers, testing laboratories, conformity assessors, specifiers and buyers who need a defined flat flexible cable for indoor wiring or lighting connections. It is also relevant to electrical product designers and installers who select cable types for internal wiring, direct supply to luminaires, and related procurement or quality checks.

What changed in SIST EN 50525-2-72:2011 from the previous edition?

SIST EN 50525-2-72:2011 supersedes HD 21.11 S1:1995 + A1:2001. The document is presented as part of the EN 50525 multipart series.

Which standards are used with SIST EN 50525-2-72:2011?

• EN 50525-1 - gives the general requirements that apply together with this part.
• EN 50363-3 - specifies the PVC insulating compounds used for the inner and outer layers.
• EN 50395 - provides the electrical test methods used in Annex A.
• EN 50396 - provides the non-electrical test methods used in Annex A.
• EN 60228 - defines conductor classes, including the class 5 conductor used here.
• EN 60332-1-2 - gives the fire test used for vertical flame propagation.
• EN 60811-1-4 - provides the low-temperature impact test method used in Annex A.
• HD 516 - gives guidance on safe use of the cables covered by this standard.

What does the SIST EN 50525-2-72:2011 document contain?

SIST EN 50525-2-72:2011 contains one cable construction, its marking, and the requirements that the finished cable has to satisfy. Annex A sets out the test programme for electrical, dimensional, material, low-temperature, mechanical and fire checks, with Table A.1 linking each check to the relevant test method.

Annex B provides general data for the cable, including the dimensional information and insulation resistance values used for assessment. Figure 1 gives a cross-sectional diagram of the cable, which helps readers understand how the divisible structure and the two insulation layers are arranged.