Patient Leakage Current (Medical Electrical Devices); Functional Test; Table 18 Leakage Current Measurement (Test Standard And Protection Class) - Benning ST 755+ Operating Manual

Functions
7.7 Individual tests
7.7.6

Patient leakage current (medical electrical devices)

Class I
-
The patient leakage current is the current that flows from active applied parts via the patient to
the PE conductor (earth). It is tested at mains voltage for medical devices of protection classes I
and II to prove proper insulation capacity. This is to ensure that no leakage current flows from
the active applied parts to earth and that there is no risk of a dangerous electric flow for the
patient [} page 88].
For this purpose, the following measuring methods may be used:
• Direct current measuring method (direct measuring method)
• Alternative leakage current measuring method
7.7.7

Functional test

Class I
X
The functional test is intended for the final verification of electrical safety and is an obligatory
part of the test standards to be considered [} page 90]:
• EN 50678 (VDE 0701)
• EN 50699 (VDE 0702)
• EN 62353 (VDE 0751‑1)
• EN 60974‑4 (VDE 0544‑4)
Non-electrical functions, e. g. cutting, lifting or turning, must be checked at a lower level.
The functional test includes the following for all single-phase test samples:
• Input voltage
• Input current
• Effective power
• Apparent power
Moreover, depending on the test standard and protection class, the corresponding leakage
current is measured.
Test standard
EN 50699 (VDE 0701)
EN 50699 (VDE 0702)
EN 60974‑4 (VDE 0544‑4)
EN 50699 (VDE 0701)
EN 50699 (VDE 0702)
EN 60974‑4 (VDE 0544‑4)
EN 62353 (VDE 0751‑1)
Table 18: Leakage current measurement (test standard and protection class)
The functional test of three-phase devices can be carried out using the BENNING MA 2-16 /
MA 4 measuring adapter. Input voltage, input current as well as effective and apparent power
cannot be measured. If necessary, performance data of the measuring adapter are displayed,
but not those of the test sample.
5284 / 08/2023 en
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II Class III
-
EN 50678 (VDE 0701)
EN 50699 (VDE 0702)
Class II Class III
X
BENNING ST 755+ / ST 760+
EN 62353
(VDE 0751‑1)
Class I Class II
- X
EN 62353
(VDE 0751‑1)
Class I Class II
- X
Protection class
I
II
I and II
EN 60974‑4
(VDE 0544‑4)
Class I
X -
EN 60974‑4
(VDE 0544‑4)
Class I
X X
Leakage current
I
PE
I
Cont
I
Leak
Class II
-
Class II
X
45