Výukový program: Mechanik - elektrotechnik

Název programu: Základy elektrotechnikyII.ročník, základní charakteristiky

elektrických zařízení

Vypracoval: Škarka Miloš

Projekt Anglicky v odborných předmětech, CZ.1.07/1.3.09/04.0002

je spolufinancován Evropským sociálním fondem a státním rozpočtem

České republiky.

The protection of electric devices by using the casing is a way of protection, where the electric device is protected against outer effects and against other objects intrusion and also serves as a protection against dangerous contact with animate parts. The protection using the casing is defined in the regulation ČSN EN 60529. Levels of protection are defined by the IP code followed by a number and in some cases even additional letters.

The first number: Expresses the level of the casing protection against a dangerous contact with animate parts, against an intrusion of other objects and expresses also resistance to dust intrusion. The summary of meanings and meaning characteristics of individual numbers are mentioned in the chart no. 1. The symbol isn‘t required by the regulation, but it is usually mentioned on electric devices for installations.

IP x x

1. protection against:

• Dangerous contact• Intrusion of other objects• Dust intrusion

2.Protection against water intrusion

If it wasn’t verified, than instead of the number there has to be the letter X.

Ingress Protection

Chart no. 1

Number Protection against dangerous contact

Protection against other objects and dust

Symbol

mustn´t reach animate parts mustn´t intrude into the casing

0 unprotected

----- unprotected ---- ----

1 Contact with a hand

ball with the diameter 50 mm pushed by the power of 50 N

object up to the diameter 50mm

ball with the diameter 50 mm pushed by the power of 50 N

----

2 Contact with a finger

Probe Φ12,5 mm with handlepushed by the power of 30 N

object up to the diameter 12,5mm

ball with the diameter 12,5 mm pushed by the power of 30 N

----

Chart no. 1

3 contact with a tool

Probe Φ2,5mm with handlepushed by the power of 3 N

object up to the diameter 2,5mm

Probe Φ 2,5mm pushed by the power of 3 N

----

4 contact with a wire

Probe Φ1mm with handlepushed by the power of 1 N

object up to the diameter 1mm

Probe Φ 1mm pushed by the power of 3 N

----

5⋆

contact with a wire

Probe Φ1mm with handlepushed by the power of 1 N

dust with granity lower than 25µm

amount jeopardizing functionality and safety of a device

6⋆

contact with a wire

Probe Φ1mm with handlepushed by the power of 1 N

dust with granity lower than 25µm

not at all

The second number :Expresses the casing resistance to water intrusion. The summary of meanings and meaning characteristics of individual numbers are mentioned in the chart no. 2. The symbol isn‘t required by the regulation, but it is usually mentioned on electric devices for installations.

Chart no. 2Number

Protection against The dangerous amount mustn‘t intrude while⋆)

symbol

0 Unprotected ---------

----

1 water falling in drops vertically

Water falling in drops from nozzles with pitch 20x20mm, water flow rate 0,4ml/min for 10 minutes

2 water falling in drops under the angle of 15° from the vertical

Water falling in drops from nozzles with pitch 20x20mm, water flow rate 1,2ml/min for 2,5 minutes– in each of the 4 positions

3 raining under the angle of 60° from the vertical

Splaching from nozzles with diameter 0,4mm on the swinging curve, nozzle flow rate 0,07l/minute, time period 10 minutes, or by shower with diameter 102mm with 122 nozzles with diameter 0,5mm and flow rate 10l/minute minimally for 1minute/m2

4 splashing water under the angle of 180° from the vertical

Splashing from 0,2m from nozzles with diameter 0,4mm on the swinging curve , nozzle flow rate 0,07l/minute, time period 10minutes, or by shower with diameter 102mm with 122 nozzles with diameter 0,5mm and flow rate 10l/minute minimally for 5 minutes

Chart no. 2

*) Intrusion of dangerous amount means that water intrudes to insulated parts, reaches animate parts, cumulates in cable muzzles or conductor spaces. It is assessed visually, but there is measuring of the insulation state as the evaluation criterion after the test.

Number

Protection against The dangerous amount mustn‘t intrude while⋆)

symbol

5 Splashing water from all directions

Splashing with hose nozzle with diameter 6,3mm from 2,5-3meters with flow rate 100l per minute for 1minute/m2

6 intensively splashing water from all directions

Splashing with hose nozzle with diameter 12,5mm from 2,5-3meters with flow rate 12,5l per minute for 1minute/m2

7 temporary flooding the object up to 0,15 m above the upper edge

immersion under water surface, the upper part at least 0,15 and the bottom part at least 1 m below the water surface for 30 minutes

8 permanent immersion of the object into deep water

immersion under water surface to the chosen depth and for the chosen time …bar

The protection using the casing

What is it, that casing protects a device from?

What is it, that casing protects an operator from?

The symbol on the picture 1 and 2 ?

Picture 1 Picture 2

The IP code composition

How many levels of protection using the casing do we know?

What is the minimum casing, that has to be on a device used for operations under the surface of a swimming pool?

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