Northern Connectors Souriau UTL Series Push-Pull Connectors - Manual (Page 46)

46 © 2012 – SOURIAU
UTL Series
Technical information
Overvoltage
UTL connectors are qualifi ed to be used on systems rated at Overvoltage category III
Per the IEC 60664-1 (formely VDE 0110) each category is linked to the end application and where the device will be implemented:
• Category IV (primary overcurrent protection equipment):
Origin of the installation
• Category III (Any fi xed installation with a permanent connection)
Fixed installation and equipment and for cases where the reliability and the availability is subject to special requirements
• Category II (Domestic applicances):
Energy consuming equipment to be supplied from the fi xed installation
• Category I (Protected electronic circuit):
For connection to circuit in which measures are taken to limit transient overvoltage.
Pollution degree
Per the IEC 60664-1 (formerly VDE 0110) the environment affects the performance of the insulation. Particles can build a bridge between
two metal parts. As a rule dust mixed with water can be conductive and more generally speaking metal dust is conductive. Finally, the
standard defi nes 4 levels of pollution:
• Degree 1 (Air conditioned dry room):
No pollution or only dry, non conductive pollution occurs. The pollution has no infl uence.
• Degree 2 (Personal computer in a residential area):
Only non conductive pollution occurs except that occasionally a temporary conductivity caused by condensation is to be
expected.
• Degree 3 (Machine tools):
Conductive pollution occurs or dry non-conductive pollution occurs which becomes conductive due to condensation which is to
be expected.
• Degree 4 (Equipments on roof, locomotives):
Continuous conductivity occurs due to conductive dust, rain or other wet conditions.
Finally, the harsher the environment is, the longer clearance and creepage distances should be. Nonetheless, according the IEC 61984,
enclosure rated at IP54 or higher can be dimensioned for a lower pollution degree. This applies to mated connectors disengaged for test
and maintenance.
Marking
The marking should give enough details to the user to know what the main characteristics are and without going deep in technical
documentation. Below examples identify the suitability of the connector:
• Example 1:
Marking of a connector with rated current 16A, rated voltage 400V, rated impulse voltage 6kV and pollution degree 3, 2 and 1 for
use in any system, preferably unearthed or delta-earthed systems:
16A 400V 6kV 3
• Example 2:
Marking of a connector with rated current 16A, rated insulation voltages line-to-earth 250V, line-to-line 400V, rated impulse
voltage 4kV and pollution degree 3, 2 and 1 for use in earthed systems:
16A 250V 400V 4kV 3
16A 250V 400V 4kV 3
16A 400V 6kV 3
IEC 61984