European standards IEC EN 61386
EN 61386.1 General requirements. Concerning all conduit systems and accessories for electrical installations. It must be used with part 2 related to each product system.
EN 61386.21 Particular requirements for rigid conduit systems and accessories.
EN 61386.22 Particular requirements for pliable conduit systems and accessories.
EN 61386.23 Particular requirements for flexible conduit systems and accessories.
EN 61386.24 Particular requirements for conduit systems buried underground.
The IK code indicates the impact resistance (in Joules) of the conduits at room temperature in compliance with the European standard EN 62262. The installer should choose a conduit with a specific IK code based on the type of installation.
WHICH IK CODE FOR WHICH INSTALLATION? (Some examples)
IK07: House exterior IK08: Gyms IK10: Underground car parks (over 100 m2) – Road tunnels (greater protection is required against fire)
IP protection rating
The IP rating, which complies with the European standard EN 60529, indicates the resistance of the CONDUIT system + FITTINGS to the penetration of external objects. The IP rating consists of two numbers: the first indicates the resistance to the penetration of solid objects (from 0 to 6) while the second defines the resistance to the ingress of water (0 to 8).
7th digit: resistance to the penetration of solid objects
3 – protected against the ingress of solid objects with a diameter = / > 2.5 mm. 4 – protected against the ingress of solid objects with a diameter = / > 1.0 mm. 5 –dust protected 6 – dust-tight.
8th digit: resistance to water penetration
0 – no protection 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 water splashes 5 – protected against water jets 6 – protected against strong water jets 7 – protected against the effects of temporary immersion in water
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 elapsed, 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 internal diameter measured, using a special sliding gauge, which must not be less than the value declared by the manufacturerE.g. 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.