UTFD17B datasheet(28/33 Pages) ETC2

28 / 33 page

UTG Series

Glossary of terms

• 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 speciﬁed withs-

tand 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 characterize 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

conﬁrmed, acceptable corresponding performance deﬁned RTI.

- RTI Elec: Electrical RTI, associated with critical electrical

insulating properties.

- RTI Mech Imp: Mechanical Impact RTI, associated with

critical impact resistance, resilience and ﬂexibility

properties.

- RTI Mech Str: Mechanical Strength (Mechanical

without

Impact)

RTI,

associated

with

critical

mechanical

strength

where

impact

resistance,

resilience and ﬂexibility are not essential”

Air gap

Creepage distance

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