The device must only be operated on a mains supply with a ground conductor
and a socket with a ground conductor contact.
If the device is operated on a grid without a ground conductor and in a socket
without a ground conductor contact, this will be deemed gross negligence. The
manufacturer shall not be held liable for any damage arising from such usage.
If necessary, provide an adequate earth connection for the workpiece.
Switch off unused devices.
Before working on the device, switch it off and pull out the mains plug.
Attach a clearly legible and easy-to-understand warning sign to the device to
prevent anyone from plugging the mains plug back in and switching it on again.
After opening the device:
-
Discharge all live components
-
Ensure that all components in the device are de-energised
If work on live parts is required, appoint a second person to switch off the main
switch at the right moment.
EMC Device
Classifications
Devices in emission class A:
-
Are only designed for use in industrial settings
-
Can cause line-bound and radiated interference in other areas
Devices in emission class B:
-
Satisfy the emissions criteria for residential and industrial areas. This is also
true for residential areas in which the energy is supplied from the public low-
voltage mains.
EMC device classification as per the rating plate or technical data.
EMC measures In certain cases, even though a device complies with the standard limit values for
emissions, it may affect the application area for which it was designed (e.g. when
there is sensitive equipment at the same location, or if the site where the device
is installed is close to either radio or television receivers).
If this is the case, then the operator is obliged to take appropriate action to recti-
fy the situation.
Check and evaluate the immunity to interference of nearby devices according to
national and international regulations. Examples of equipment that may be sus-
ceptible to interference from the device include:
-
Safety devices
-
Network, signal and data transfer lines
-
IT and telecommunications devices
-
Measuring and calibrating devices
Supporting measures for avoidance of EMC problems:
1.
Mains supply
-
If electromagnetic interference arises despite the correct mains connec-
tion, additional measures are necessary (e.g. use of a suitable line filter)
2.
Welding power-leads
-
must be kept as short as possible
-
must be laid close together (to avoid EMF problems)
-
must be kept well apart from other leads
3.
Equipotential bonding
8
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