Chapters:
Standard and construction characteristic
Normal operating conditions
Degree of protection
Level of self-extinguishing
Behaviour to chemical agents


STANDARDS AND CONSTRUCTION CHARACTERISTICS


Introduction
The catalogue includes a wide range of plugs and sockets designed mainly for industrial use, where the ambient temperature does not normally exceed 40 °C. Thanks to the manufacturing characteristics and to the use of materials with superior performance and resistance to chemical and environmental agents, these devices are widely used also in building sites and in other sectors, like workshops, agriculture and offices.
In the case of use in special environments, for example on ships, or in areas with explosion hazards, special characteristics can be required.

Reference standards
The standards, from a point of view of dimensions and performance, for this family of products are defined at an international level and included in the European standards:

IEC60309-1 EN 60309-1 Plugs and sockets for industrial use.  
Part 1: General provisions.

IEC 6060309-2 EN 60309-2 Plugs and sockets for industrial use.  
Part 2:Provisions of dimensional interchangeability for plugs and sockets with cylindrical pins and sleeves.

Schyller has a complete offer of electrical plants components 

 
Definitions

The various applications of plugs and sockets include the following devices:

Plug and socket outlet: Device which allows the connection of a flexible cable to a power supply installation: it comprises the combination of a socket and a plug.

Socket: Part which is to be installed in the power supply installation or incorporated in switchgear and control gear.

Plug: Part which is securely connected, or designed to be connected, to a flexible cable connected to an appliance or to a connector.

Wander plug and socket connection: Device which permits the connection of two flexible cables: it comprises a wander socket and a plug.

Wander plug: Part which is securely connected, or designed to be connected, to a power supply flexible cable.

Appliance plug inlet: Device which permits the connection of a flexible cable to an appliance: it comprises a wander socket a plug inlet.

Plug inlet: Incorporated part fixed, or designed to be fixed, to an appliance.

 

   
Principal provisions

The standards cover the use of plugs and  sockets with either alternate current, frequency of up to 500 Hz, or direct current, divided into two main classes:

  • extra-low voltage plugs and sockets, with operating voltage of up to 50 V.

  • low voltage plugs and sockets, with operating voltage of 50 V to 690 V.

The standards cover rated currents of 16 and 32 A with 2P and 3P configurations for extra-low voltage, and rated currents of 16, 32, 63 and 125 A with 2P+E , 3P+E and 3P+N+E for low voltage.
There is a specific model for each use, with different rated characteristics of voltage, frequency, polarity and application, incorporating safety hindrances which make it impossible to insert any plug in a socket which is not the exact corresponding type.
Non-interchangeability is ensured by compliance with the different standardised dimension tables which indicate different ground contact positions in relation to a standard fixed reference of the connection.

Low voltage versions > 50 V

In the low voltage versions non-interchangeability is ensured by means of two elements:

  • a guide spline on the socket which matches with a corresponding nib on the plug.

  • a ground contact larger than the other contacts, in a different clock position according to the rated operating characteristics.

The clock position (h) of the ground contact is checked by observing, with the socket viewed from the front, the position of the ground contact in relation to the main keyway (guide spline), always positioned at 6 o’clock.

 

Extra-low voltage versions < 50 V

Also for these versions, with no ground contact, non-interchangeability is ensured by means of two reference elements:

a guide spline on the socket which matches with a corresponding nib on the plug, always at a fixed 6 o’clock position.

a secondary keyway, also this a spline on the socket to which corresponds a nib on the plug, at different clock positions according to the operating characteristics.

The clock position (h) of the secondary keyway is checked by observing, with the socket viewed from the front, the position of positioned at 6 o’clock

 

   
Coded colours
For easy identification of the operating voltage, the standard indicates conventional coded colours which may involve the entire device or only one part (e.g., lift cover, ring, etc.)

 

1) : For a frequency above 60 Hz and up to 500 Hz included, the green colour can be used, if necessary, in conjunction with the colour of the rated operating voltage.
Rated operating
voltage V		 Colour (1)
10 to 25 violet  
40 to 50 white  
100 to 130 yellow  
200 to 250 blue  
380 to 480 red  
500 to 690 black  
 
Clock references

The range comprises all versions covered by the standards, including the more specific ones.

Although the catalogue covers only some standard models, it is possible to have all the different clock positions specified by the standard; the following are some of the positions for this range

 

Application Clock pos.
ground cont.
common use hour 6
refrigerated containers hour 3
marine,warf adnd ship installation hour 11
power supply trough isol.tansforme (TST) hour 12
direct current 50 to 250V hour 3
direct current above 250V hour 8
High frequency
100 to 300Hz		 hour 10
above 300 up to 500 Hz hour 2
Special Voltage
100 to 130V		 hour 4
480 to 500 V hour 7
600 to 690V hour 5