zebris Medical GmbH
FDM Technical Data and Operating Instructions
Page 50/54
7.2.3 Use of multiple sockets
The following information and warnings are based on the requirements of the Standard DIN
EN 60601-1:2006, Section 11 for medical electrical equipment and have to be enforced
when the FDM system is used for medical purposes.
WARNING
If multiple sockets are used for connecting the FDM-T system or its
components, the following safety regulations are to be observed:
Always connect the treadmill and FDM sensor directly to mains supply by using a sepa-
rate wall socket with a tested protective earth conductor and separate fuse.
Multiple sockets can be used without causing any danger for connecting the PC and other
electrical accessories (video camera, illumination) outside the patients’ vicinity.
Multiple sockets must not be placed on the floor to avoid accidentally penetration of liquids
or mechanical damages.
It is forbidden to use extension cables or several multiple sockets connected in series.
In commercially available multiple sockets, system components set up within and outside
the vicinity of the patient must never be plugged in together. (Example: It is forbidden to
connect the PC and the power supply unit of the FDM sensors to the same multiple
socket.)
If multiple sockets are used jointly for components of the FDM system, that are allowed
to be located within the vicinity of the patient (e.g. treadmill, FDM sensor or other zebris
measuring systems) and components that have to be outside the vicinity of the patient
(e.g. PC, video camera), the multiple socket and complete interconnection of the system
must adhere to all the requirements of DIN EN 60601-1:2006 Section 16. If necessary,
an isolating transformer is to be used for an arrangement of this kind, and the ground
leakage current in the protective earth conductor of the multiple sockets must not exceed
5 mA. The adherence to the maximum permissible patient leakage currents is to be veri-
fied by measuring. If a multiple socket was integrated after setting the system into oper-
ation for the first time, no additional device may be connected to it (use multiple sockets
with locking covers for this purpose)
WARNING
Coupling the mains connection of components of medical electrical
systems and other, not supplied components by using multiple sock-
ets according to EN 60601-1 is a very dangerous practice.
It is possible for excessive touch currents to occur if mains are con-
nected without the user having any respective expert knowledge.
Due to these complications zebris Medical GmbH urgently advises not
to use multiple sockets for operation of the system.
