Application Of The X-Ray Regulations - ABB VM1 Instruction Manual

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 (Stipulation 96/29/Euratom of the senate
from 13 May 1996 (ABI.L 159 from 29 June 1996)).
- Application of the rated voltage specified for the switching
device by VDE 0671 part 100 or IEC 62271-100 is com-
pletely 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.
Instruction manual 504/05 | VM1 Vacuum circuit-breaker 21