5. Technical Safety Inspection and Preventive Maintenance
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5.1.1 Measurement Circuits for Measurement of Electrical
Safety According to IEC 62353/60601-1
Protective earth (ground)
L, N
Supply mains terminals
PE
Protective earth terminal
MP
Mains part
AP
Applied part
MD
Measuring device
M
Residual current meter with frequency
response as MD
Resistance measurement equipment
Part of enclosure not protectively earthed
Connection to accessible conductive parts
Table 1: Legend of Abbreviations and Symbols
L
N
PE
MP
AP
Fig. 1: Protective Earth Resistance
Protective Earth Resistance
Test current:
≥
200 mA
The test current must be measured in both
directions.
MP
AP
M
L
L(N)
N(L)
N
PE
Fig. 2: Equipment Leakage Current
Equipment Leakage Current:
•
Differential Measurement
MP
AP
MD
L
N
PE
Fig. 3: Patient Leakage Current
Patient Leakage Current