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Technical info

 

European Standards IEC EN 61386

All conduits and fittings manufactured by PM Plastic Materials are compliant with the European standards as follows:

 

EN 61386.1 General requirements, referring to all conduit systems. It is to be regarded together with the appropriate part 2, that provides specific requirements for each single type of conduit system.

EN 61386.21 Particular requirements – Rigid conduit systems.

EN 61386.22 Particular requirements – Pliable conduit systems.

EN 61386.23 Particular requirements – Flexible conduit systems.

EN 61386.24 Particular requirements – Conduit systems buried underground

 

 

Classification code

The product classification code consists of 12 digits. The conduit must be marked with the first 4 digits, at least.

 

1° digit: Resistance to compression

1 – extra light (125 Newton)

2 – light (320 Newton)

3 – medium (750 Newton)

4 – heavy (1.250 Newton)

5 – extra heavy (4.000 Newton)

 

2° digit: Resistance to impact

1 – extra light (0.5 Joules)

2 – light (1 Joule)

3 – medium (2 Joules)

4 – heavy (6 Joules)

5 – extra heavy (20,4 Joules)

 

3° digit: minimum permanent application and installation temperature

1 – (+5°C)

2 – (-5°C)

3 – (-15°C)

4 – (-25°C)

5 – (-45°C)

 

4° digit: maximum permanent application and installation temperature

1 – (+60°C)

2 – (+90°C)

3 – (+105°C)

4 – (+120°C)

5 – (+150°C)

6 – (+250°C)

7 – (+400°C)

 

Example: ICTA 3422

 

 

IK Code

The IK code represents the impact resistance (in Joule) of conduits at room temperature, in compliance with the European standard EN 62262. According to the type of installation, installers have to choose a conduit with a specific IK code.

 

 

WHICH IK FOR WHICH INSTALLATION? (Some examples)

IK07: Outside a house
IK08: Gyms
IK10: Underground parking (more than 100 sqm) – Road tunnels (need for a higher protection level against fire)

 

IP Protection Degrees

The IP number, which is compliant with the European standard EN 60529, indicates the resistance of conduit systems (pipes + accessories) against the penetration of external elements.
It consists of two digits: the first one defines the resistance to the penetration of solid bodies (from 0 to 6), the second one identifies the resistance to water penetration (from 0 to 8).

 

7° digit: resistance to the penetration of solid bodies

3 – protected against the penetration of solid objects of diameter = /> 2,5 mms.
4 – protected against the penetration of solid objects of diameter = /> 1,0 mms.
5 – dust protected
6 – dust-tight.

 

8° digit: resistance to water penetration

0 – none declared
1 – protected against vertically falling water drops
2 – protected against vertically falling water drops
(system tilted up to 15°)
3 – protected against rain
4 – protected against squirts
5 – protected against water jets
6 – protected against strong water jets
7 – protected against the effects of temporary immersion in water.

 


 

Technical tests

The insulating pipes for electrical systems that fall within the scope of the European Low Voltage Directive 2006/95/EC must comply with the requirements established by the new International/European IEC EN 61386 standards.
These standards indicate the specifications and laboratory tests that the pipes must undergo in order to be certified.

 

Compression and deflection tests

1. The sample pipe is subjected to an increasing compressive load so that, at a given time, it reaches the force defined by the standard; the intensity of the force is measured in Newtons.
2. Once this force has been reached, the deflection level is measured, i.e. the difference between the original outer diameter and the post-test outer diameter. This deflection must not exceed the limits imposed by the standard.
3. Once the deflection has been measured, the force is removed and, 15 minutes after, the so-called “self-recovery” capacity is measured: the difference between the original outer diameter and the post-test outer diameter should not exceed 10%.

 

Es. ICTA 3422
The resistance to compressive strength is expressed by the first digit: 3
The sample of ICTA 3422 is subjected to a force that, in 30 seconds, reaches an intensity of 750N: following this force, deflection of the sample must not exceed 50% (for ICTA 20 mm, for example, the decrease in diameter must not exceed 10 mm).
“Self-recovery” capacity: for the ICTA diam. 20, the post-test diameter must be at least 18mm.

 

Impact resistance test

1. The sample pipe and equipment are conditioned for at least two hours, at the minimum operating temperature required by the standard
2. The sample is then hit by a hammer placed at a given distance set by the standard (even the hammer mass changes according to the declared classification)
3. The sample subjected to this shock must remain perfectly intact, without any cracks visible to the naked eye in order to be compliant with standard specifications.

 

Es. ICTA 3422
Impact resistance is expressed by the second number: 4
The ICTA 3422 sample is cooled to a temperature of -5°C and, after 2 hours, subjected to a 6 Joules energy shock test (1 x 2kg hammer placed 30 cm from the sample).

 

Resistance test at the minimum operating and installation temperature

1. During the impact resistance test, the mechanical resistance at the minimum temperatures required by the standard is also tested.

Es. ICTA 3422
Resistance to minimum operating and installation temperature is expressed by the third digit: 2
The impact test is performed on samples chilled to -5°C.

 

Resistance tests at maximum operating and installation temperatures

1. The sample is placed in a kiln at the temperature required by the standard for 4 hours.
2. After this time has lapsed, the sample is loaded for 24 hours with the weight specified by the standard whilst still inside the kiln.
3. After 24 hours, the load is removed and the “collapse value” is measured: the internal diameter, which is measured using a special sliding gauge, must not be less than the value declared by the manufacturer.

Es. ICTA 3422
Resistance to maximum operating and installation temperature expressed by the fourth digit: 2
The ICTA 3422 sample is placed in a kiln at a temperature of 90°C for 4 hours and is then weighted with a load of 2 kg for 24 hours. After the test, the internal diameter must not be less than the minimum internal diameter indicated by the manufacturer.

 

Fire resistance test

This test is only performed on plastic canalizations, which are declared self-extinguishing, with a 1KW flame

1. The sample ICTA pipe is tested using a flame rising from a temperature of 100°C to a temperature of 700°C in just 45 seconds.
2. The flame must be applied for a time that varies, depending on the thickness of the pipe wall (for example, a 20 diameter pipe will require an application time of 20 seconds).
3. When this time has lapsed, the flame is removed: at this point, the pipe must not burn for more than 30 seconds and any drops must not ignite the tissue paper placed under the pipe.

 

Bending resistance

RIGID CONDUIT (fifth digit= 1)
Conduits with outer diameter 16, 20 and 25 mm, declared cool bendable by the manufacturer, have to be tested with a specific device: before starting the test, a steel cylindrical bender is inserted inside the conduit, to avoid its collapse during the bending. Conduits must be cool tested, after being conditioned for at least two hours, at the minimum operating temperature required by the standard, and their bending radius has to be at least 6 times their diameter.

PLIABLE/SELF-RECOVERING PIPE (fifth digit= 2/3)
Pipes have to be tested with a specific device, without introducing the bender. Pipes have to be warm tested and their minimum bending radius has to be 3 times their diameter. After the test, the samples do not have to show visible cracks and the difference between the original outer diameter and the post-test outer diameter should not exceed 10%.

PLIABLE PIPE (fifth digit= 4)
Bending resistance test is not available.

 

Glow wire test

Glow Wire Test measures the self-extinguishment using a glowing wire.
This test is relevant for accessories, which can have two different resistance temperature: 850°C and 960°C.
During the test, a glowing wire, which reaches the temperature established by the standard, is positioned in contact with the accessory for a fixed time. After the wire has been removed, the accessory combustion has to finish.

 

Insulation resistance and dielectric strength

Pipe samples are soaked for a length of 1 m +/-10 mm in salted water, at the temperature of 23 (+/- 2)°C. A surface of approximately 100 mm has to be left outside the water level. Two electrodes are then positioned: one inside the pipe, one inside the tank.

DIELECTRIC STRENGHT TEST: 24 hours later, a growing tension from 1000 to 2000 V is applied to the electrodes. When the 2000 V tension is reached, it has to be maintained for 15 minutes.
The samples have an adequate dielectric strength if the security device does not intervene during the 15 minutes test.

INSULATION RESISTANCE TEST: A constant tension of 500 V is applied between the two electrodes. testing the insulation resistance after 60 seconds.
Pipe insulation resistance is adequate if it exceeds 100 MΩ.