8.3.4 Substitute patient leakage current (I
EPA
)
Patient leakage current measured via the alternative measuring method
(new designation according to DIN VDE 0751-1:2008-08: Leakage current
from the applied part - alternative measurement), see Image C7 (Page 51).
8.3.5 Leakage current from the applied part – Alternative
measurement
Leakage current determined via the alternative measuring method
(previously designated as substitute patient leakage current).
8.3.6 Patient leakage current (I
PA
)
Current flowing from the applied part through the patient to earth, or current
caused by an unforeseen foreign voltage at the patient and which flows
through the patient and an applied part of Type F to earth (DIN VDE 0751-
1:2008-08). In the latest issue of DIN VDE 0751-1, the leakage current from
the applied part is measured instead of the patient leakage current.
8.3.7 Leakage current from the applied part
Current flowing from the power supplies and touchable conductive parts to
the applied part.
8.3.8 Patient leakage current – Mains voltage at the applied part
Patient leakage current determined by applying an auxiliary voltage
between the mains protective conductor (and housing parts) and the applied
part (new designation according to DIN VDE 0751-1:2008-08: Leakage
current from the applied part - mains voltage at the applied part).
8.3.9 Leakage current from the applied part – Mains voltage at the
applied part
Leakage current determined by applying an auxiliary voltage between the
mains protective conductor (and housing parts) and the applied part
(previously designated as patient leakage current - mains voltage at the
applied part).
15
Operating manual for the TG uni 1, TG euro 1 and TG euro 1 med appliance tester
Explanation of terminology
8.4 Insulation resistance (R
ISO
)
Ohmic resistance between the conductive parts separated by insulation.
Measurements are taken between the active parts and the body as well as
touchable conductive parts that are not connected to the protective
conductor.
Also see measuring principle circuits on Page 17.
8.5 Protective measures
When defining the test procedures, a distinction is no longer made according
to the protection class as previously but rather the existing protective
measures of the test object are taken into consideration and their
effectiveness at the respective touchable conductive part is to be verified.
The appliance tester makes the following classifications:
8.5.1 Devices with a protective earth connector (PC I)
The active parts of the device are protected against direct touching by the
basic insulation. Through connection of the touchable conductive housing
parts to the protective conductor, these are included in the protective
measure in the case of indirect touching (fault protection) with the system.
The residual current is measured via the protective conductor current
measurement.
The device may also have touchable conductive parts that are not
connected to the protective conductor. The residual current is measured via
the touch current measurement.
The device has a protective conductor connection (earthed plug).
