Datasheet

207
•Clearance
Per the IEC 60664-1 it is the shortest
distance between two conductive parts
even over the air.
•Creepagedistance
Per the IEC 60664-1 it represents the
shortest distance along the surface
of the insulating material between two
conductive parts.
•Workingvoltage
Per the IEC 60664-1 it is the highest r.m.s. value of A.C. or D.C. voltage
across any particular insulation which can occur when the equipment is
supplied at rated voltage.
•Ratedimpulsevoltage
Impulse withstands voltage value assigned by the manufacturer to
the equipment or to a part of it characterizing the specied withstand
capability of its insulation against transient overvoltage.
•Workingcurrent
It is the maximum continuous and not interrupted current able to be
carried by all contacts without exceeding the maximum temperature of
the insulating material.
•Transientvoltage
Extract from the IEC 60664-1: Short duration overvoltage of a few
millisecond or less, oscillatory or non-oscillatory, usually highly damped.
•CTI(ComparativeTrackingIndex)
The CTI value is commonly used to characterise the electrical
breakdown properties of an insulating material. It allows users
to know the tendency to create creepage paths. This value
represents the maximum voltage after 50 drops of ammonium chloride
solution without any breakdown.
•RTI(RelativetemperatureIndex):
Extract from ULs website:
Maximum service temperature for a material, where a class of
critical property will not be unacceptably compromised through
chemical thermal degradation, over the reasonable life of an
electrical product, relative to a reference material having a
conrmed, acceptable corresponding performance dened RTI.
- RTI Elec: Electrical RTI, associated with critical electrical
insulating properties.
- RTI Mech Imp: Mechanical Impact RTI, associated with
critical impact resistance, resilience and exibility properties.
 - RTI Mech Str: Mechanical Strength (Mechanical without
Impact) RTI, associated with critical mechanical strength where
impact resistance, resilience and exibility are not essential.
Air gap
Creepage distance
Glossary of Terms
UTS Series
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Appendices
Appendices