HT instruments SPEED418 User Manual

Page 76

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400

Series

EN - 75

EXAMPLE OF CHECKING THE SEPARATION AMONG ELECTRICAL CIRCUITS

Insulation or safety transformer
separating the circuits

TEST BETWEEN ACTIVE PARTS
Connect an instrument probe to
one of the two conductors of the
separated circuit and the other to
one of the conductors of a non-
separated circuit

TEST BETWEEN ACTIVE PARTS
AND EARTH
Connect an instrument probe to
one of the two conductors of the
separated circuit and the other to
the equalizing potential node. This
test must be performed for SELV
circuits or circuits with electrical
separation only

Equalising potential node

Fig. 35: Measurement of separation among the installation circuits

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