NYAF Cables Selection Guide
NYAF covers the H05V-K and H07V-K types, with rated voltage changing at small cross-sections; panel wiring picks cross-section and color by circuit current.
This guide explains what to check when selecting products in the NYAF Cables category.
H05V-K and H07V-K: rated voltage changes at small cross-sections
The NYAF name covers two harmonized types. In the HES Kablo datasheet, the 0.5 mm², 0.75 mm² and 1 mm² cross-sections are type H05V-K with a rated voltage of 300/500 V; cross-sections of 1.5 mm² and above are H07V-K in the 450/750 V class. When choosing 0.75 mm² or 1 mm² for a control circuit, confirm from the product datasheet that the circuit voltage fits this class. For both types the maximum operating temperature is 70 °C.
Choosing cross-section and color in panel wiring
Inside a panel, cables run bundled in trunking and often in a space warmer than the installation environment; both reduce the current a conductor can carry. After choosing the cross-section by circuit current, apply the bundling and temperature corrections. The cable current carrying capacity calculation tool gives a preliminary value from the ambient temperature and the number of circuits grouped together; in panel design, the manufacturer's table and the verification of the panel's temperature rise are the basis.
The outer diameter and resistance of a fine-stranded conductor are slightly higher than those of a solid conductor of the same cross-section: in the HES datasheets, 2.5 mm² NYAF has an outer diameter of about 3.6 mm and a DC resistance of 7.98 Ω/km at 20 °C; for NYA of the same cross-section these values are 3.3 mm and 7.41 Ω/km. When selecting panel cable trunking, calculate the fill using the NYAF diameter.
Yellow-green is reserved for protective conductors only. Which circuit each of the other colors, such as black, red, blue, brown, gray, white and pink, is assigned to (power, AC control, DC control, neutral) is determined by the panel specification and the machine electrical equipment standard.
Termination
- Screw terminal block: Fine strands are gathered with cable ferrules; the ferrule cross-section is chosen the same as the conductor cross-section. If two conductors will be connected to the same terminal entry, a twin ferrule is used.
- Bolted connection: On busbars, switches and earthing points, large-cross-section NYAF is terminated with cable lugs; the lug cross-section is chosen to match the conductor and the hole diameter to match the bolt.
The difference between NYAF and similar cables
NYAF is unsheathed; the manufacturer datasheet defines its place of use as device connections and, inside buildings, dry locations, in conduit flush-mounted or surface-mounted. The K in the code indicates that the conductor is fine-stranded for fixed installation.
- NYA: NYA cables have the same insulation, but the conductor is rigid. It connects to a screw terminal block without a ferrule; it is preferred on straight conduit runs.
- Halogen-free NYAF (H07Z1-K): NYAF halogen-free cables have the same flexible conductor, but the insulation is halogen-free. They are chosen in the panels of buildings where low smoke and low corrosive gas are required in a fire.
- TTR (H05VV-F): TTR cables are sheathed, multi-core flexible cables; for portable device supplies this type is used, not single-core NYAF.
- Multicore control cables: On multi-conductor runs from the panel to the field, YSLY control cables, which gather the cores in a single sheath, are used instead of individual NYAF conductors.
Brands in this category
HES Kablo, Nexans, Prysmian, Ünal Kablo, Koç Kablo and Öznur Kablo list NYAF in color options from small control cross-sections to large power cross-sections.
Order notes
The sales unit is the meter; the cross-section and color are written in the product name, so select both together. Some of the products are listed as made-to-order, and for these the lead time is confirmed before the order is placed.
NYAF (H05V-K / H07V-K) cross-section and application table
| Cross-Section | Rated Voltage | Conductor Class | Typical Panel Application | Cross-Section Page |
|---|---|---|---|---|
| 1x0.75 mm² – 1x1 mm² | 300/500 V (H05V-K) | IEC 60228 Class 5 (Fine-stranded flexible) | PLC digital/analog I/O, relay coils, and auxiliary control wiring | 1x1 mm² NYAF Cables |
| 1x1.5 mm² – 1x2.5 mm² | 450/750 V (H07V-K) | IEC 60228 Class 5 | Panel control circuits, current transformer (2.5 mm²) leads, and MCB feeders | 1x2.5 mm² NYAF Cables |
| 1x4 mm² – 1x16 mm² | 450/750 V (H07V-K) | IEC 60228 Class 5 | Contactor, motor starter, and sub-distribution power jumpers | 1x6 mm² NYAF Cables |
| 1x25 mm² – 1x240 mm² | 450/750 V (H07V-K) | IEC 60228 Class 5 | Flexible high-current links between MCCBs and copper busbars | 1x35 mm² NYAF Cables |
Frequently asked questions
Can NYAF cable be used in conduit in fixed installations?
The manufacturer datasheet lists conduit, flush-mounted or surface-mounted, in dry locations inside buildings among the places of use for NYAF. The K in the type code also means a fine-stranded conductor for fixed installation. The cable is unsheathed; the usage description in the datasheet does not cover installation in the open, in damp environments or underground, and sheathed cable types are considered for those places.
Is a ferrule needed on the end of NYAF cable?
In screw terminal blocks, fine strands can spread out under the screw and some may be left outside the clamping; a ferrule prevents this by gathering the strands into a single body. Using a ferrule on screw connections is established practice in panel building. Some spring terminal blocks accept fine-stranded conductors without a ferrule; which applies is stated in the terminal block manufacturer's data. The ferrule cross-section is chosen the same as the conductor cross-section.
What is the rated voltage of 0.75 mm² and 1 mm² NYAF cable?
In the HES datasheet, the 0.5 mm², 0.75 mm² and 1 mm² cross-sections are type H05V-K with a rated voltage of 300/500 V. Cross-sections of 1.5 mm² and above are type H07V-K, in the 450/750 V class. The 05 and 07 in the code indicate these two voltage classes. When using small-cross-section NYAF in a control circuit, check from the product datasheet that the circuit voltage stays within this class.
Do NYAF and NYA carry the same current at the same cross-section?
In the HES datasheets, the same current values are given for both cables at cross-sections of 1.5 mm² and above; for example, for 2.5 mm² both state 32 A in air at an ambient temperature of 30 °C. The resistance of a fine-stranded conductor is slightly higher: 7.98 Ω/km against 7.41 Ω/km for 2.5 mm². Inside a panel the real value drops because of bundling and ambient temperature; correction factors are applied in design.
On a control line from the panel to the field, is NYAF or multicore cable used?
NYAF is an unsheathed single-core conductor; it is used protected in trunking inside the panel or in conduit within the installation. On multi-conductor control lines from the panel to the field, control cables that gather the cores under a single sheath are chosen: unshielded YSLY, or YSLCY, which is shielded against electrical noise. Because the cores in these cables are numbered or colored, tracing the ends is also easier.