Table of Contents
Advertisement
5. EQUIPOTENTIAL BONDING CONDUCTOR
An equipotential bonding conductor is an additional conductor (accessory; not included in
the scope of delivery) that establishes a direct connection between the electrical unit and the
equipotential bonding busbar of the electrical installation. The mobile light on a mobile stand
as well as the wall-mounted lights have a PE connection on the housing of the mobile stand or
on the wall mount, respectively, so that possible potential differences that can occur as voltage
sources are avoided in the patient environment, including in connection with parallel use of
other units. Such voltage sources can cause currents via the body resistance that not only flow
over the patient, but can also affect or even endanger doctors and nursing staff. Active medical
devices may malfunction due to such outflowing currents.
In class 2 rooms used for medical purposes, in addition to the protective measures according
to DIN VDE 0100 Part 410, all external conductive parts within the patient environment are
connected (electrically to each other and) to the equipotential bonding busbar. This means that
the equipotential bonding conductor must be connected to an equipotential bonding busbar.
To ensure that the permissible touch voltage of 10 mV is not exceeded (∆u ≤ 10mV), potential
equalization (PE) must be performed. For this purpose, the PE conductor (see Accessories list)
of the light must be connected to the PE busbar.
NOTE: For wall-mounted lights, the protective earth conductor serves only as a
functional earth (protection class II).
For ceiling-mounted lights, an on-site equipotential bonding conductor must be connected to
the respective ceiling panels when installed in class 2 rooms used for medical purposes, as also
mentioned in the respective installation instructions.
Figure. PE connection socket on mobile stand
Figure. PE connection socket on the mobile stand
with the green/yellow equipotential bonding
conductor
Figure. PE connection socket on the mobile
stand
with
the
green/yellow
bonding conductor
equipotential
15
Advertisement
Table of Contents
