Characteristics of the heating wire PNSV

The PNSV wire is quite specific and is not used to connect electricity consumers to the network, it is an electric heater. Most often, this type of conductor is used for heating concrete, which allows for construction work in the winter. Let's take a closer look at the technical characteristics of the PNSV wire, design features and scope.

Decoding abbreviations and design

The marking of the PNSV stands for:

  • P - wire;
  • N - heating;
  • C - steel;
  • In - in a vinyl cover.

Heating conductor

Thus, the marking indicates what the wire consists of: steel core, galvanized or non-galvanized, coated with PVC or special polyethylene insulation.


The table lists the main technical characteristics of the PNSV:

Number of lived 1 PC.
Core material Steel
Maximum heating temperature 80 degrees celsius
Installation temperature Not lower than -15 degrees Celsius
Working temperatures -60 to +50 degrees Celsius
Minimum bending radius At least 5 outside diameters
Permissible voltages 380V
Recommended Supply Voltage 60-75V
Power density 1.5 - 2.5 kW / m3
Resistivity 1.2 sq. mm - 0.15 Ohm; 2 sq. mm - 0.044 Ohms; 3 sq. mm - 0.02 Ohm;
Insulation resistance 1 MΩ / 1 km
Insulation thickness 0,8-0,17
Mode of operation Intermittent or prolonged
Consumption 50-60 l.m. per 1 m3 of concrete
Life time 15 years

In the section table below, the basic set of characteristics is also indicated, it will help in choosing the right wire size:

PNSV section table

Application area

We reviewed the characteristics, now let's talk about where the PNSV heating wire is used. It is used for concrete heating, for example, when it is poured at low temperatures, for its hardening.

Concrete heating in winter

In addition, PNSV can be used for heating. In agriculture and everyday life, the conductor is used for heating the soil, heating water pipes and gutters, for sewage, so that the water does not freeze in the cold season. Indoor wire has found its application as a heating element of a warm electric floor. As already mentioned, PNSV is of two types: with galvanized and non-galvanized core. It is worth noting that a non-galvanized core is subject to corrosion.

How to connect and lay a wire

The PNSV wire is connected to the network through a step-down transformer, the voltage on the secondary winding of which should be in the region of 60-75V. Secondary current - from tens to hundreds of amperes, depending on the power of the heater. When designing a heating system with a PNSV wire, it is necessary to ensure that the specific power is in the range of 1.5-2.5 kW for a conductor with a cross section of 1.2 square meters. mm

PNSV 1.2 photos

It is worth noting that the most common wires with a cross section of 1.2 - 1.4 mm, but there are also options with a cross section of up to 6 square meters. mm

It is impossible to connect PNSV directly to the transformer, since it is heated and you will not get a reliable connection. It is necessary to connect the wire to the transformer with cold ends. That is, the PNSV is connected to current-carrying conductors made of copper or aluminum in any reliable way. For copper, it is possible to use soldering with refractory solders (POS-60 is not recommended, although its melting point is several times higher than the working temperature of the wire). Soldering is combined with a brace made of copper wire. It is possible to use terminal blocks and other types of connections.

This connection must NOT be made in concrete!

Foundation warming up

The connection diagram of the PNSV to a three-phase transformer is shown in the figure:

Connection diagram of PNSV to a transformer

It is worth noting that the length of the wire is selected so that the current through it does not exceed 15A, if you need to heat a large area - combine such segments with sections. On average, such a current is provided with a section length of 15-18 meters and a supply voltage of 70V.

Laying wires in concrete

For food KTPTO-80 is suitable. This is a complete transformer substation with a transformer of 80 kVA for heating concrete. You can also connect the heating wire to a powerful welder with an output current of 150-250A. This option is suitable for home use, so as not to rent professional powerful equipment. Here is the connection diagram of the PNSV to the welding machine:

Connection of PNSV to the welding machine

Laying the wire must be done so that the distance between adjacent cores is not less than 15 cm. To obtain a uniform thermal field, it can be wrapped with a layer of foil 0.2-0.5 mm thick.

How to replace it

To replace PNVS, you can use PTPZH, it has similar characteristics. The analogue can be bent by a radius equal to 10 minimum diameters, the difference is that it has 2 wires. To heat concrete, you can use PTPZh 2x0.6. The BET heating cable is also suitable for a warm floor or concrete heating system, has a specific power of 40 W / m, its design allows you to work with a mixer and a vibrator. PNSP - also suitable for replacing PNSV. Among heating cables, KDBS can also be distinguished - this resistive heating cable is designed for quick hardening of concrete.

Finally, we recommend watching a useful video on the topic:

On this we end the description of the characteristics of the PNSV wire. Now you know where this conductor can be used, how it connects to the network and which has analogues.

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