Application Of The X-Ray Regulations - ABB VD4 Installation And Service Instructions Manual

D I S T R I B U T I O N S O L U T I O N S
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8. Application of the X-ray regulations

One of the physical properties of vacuum insulation
is the possibility of X-ray emissions when the
contact gap is open. The specified test performed
by the Physikalisch-Technische Bundesanstalt (PTB)
in Braunschweig demonstrates that the local dosage
output of 1 µSv/h at a distance of 10 cm from the
touchable surface is not exceeded when the rated
voltage is applied.
The results are as follows:
• Testing of the switching device or the vacuum
interrupter to VDE 0671 part 100 or IEC 62271-100
at the relevant rated power frequency withstand
voltage may only be performed by trained
personnel observing the stipulations of the EU
basic standard [Directive 96/29/Euratom of the
Council of 13 May 1996 (ABI.L 159 of 29 June 1996)].
• Application of the rated voltage specified for the
switching device by VDE 0671 part 100 or
IEC 62271-100 is completely safe.
• Higher voltages than the rated voltage or DC test
voltage specified in VDE or IEC standards must
not be applied!
• The containment of the above mentioned local
dosage output with the vacuum interrupter in the
open position is dependent on maintenance of the
specified distance between the contacts (which is
automatically ensured with correct mechanism
function and force transmission).
• Safety clearances must be maintained.
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