Dimensioning clearance and
creepage distances:
400 applies to:
phase conductor–phase conductor
250 applies to:
phase conductor–N-conductor
phase conductor–PE conductor
N-conductor–PE conductor
Test-disconnect terminals
Test-disconnect terminals are used
for the short-term separation of
circuits order perform test and
measurements no-voltage state.51282250000 2012/2013
. They enable simple
testing without the need disconnect
the neutral conductor.Definitions the various types
N-conductor disconnect terminals
A neutral-conductor disconnect
terminal special type test-
disconnect terminal with lateral
disconnection.
NT
W
Technicalappendix
W. However the rated surge
voltage resistance (supplied the
manufacturer) must verified the
opened disconnect point.
They are covered the scope the
IEC 60947-7-1 (Appendix D). connected a
neutral-conductor busbar.
The dimensions for the clearance
and creepage distances the
opened disconnect points are not
evaluated. covered
by the scope the IEC 60947-7-1
(Appendix D)
