Hioki ST5540, Instruction Manual, Page: 27 / 326

1.6 Types of Leakage Current Measurement
21
1
Chapter 1
Overview
*
Measurement with a disconnected protective earth conductor is applicable only to Class-I equipment.
List of Leakage-Current Measurement Items
Measurement
Normal
condition
Single-
fault
condition
(Description of fault) (Other conditions)
Touch current
Enclosure - Line
 
1. One wire in the power
cord is disconnected.
2. protective earth conduc-
tor is disconnected
*
Situation other than touch current
(Enclosure - Line) is applicable
1. Functional grounding wire is disconnected
2. Grounding wire for patient connection and power
supply circuit for measurement are disconnect-
ed
3. A voltage that is 110% of the rated voltage is ap-
plied between an isolated signal input/output
section and earth (Not medical equipment)
Touch current
•
Enclosure - Earth
•
Enclosure - Enclosure
Earth leakage current
 
1. One wire in the power
cord is disconnected.
1. Functional grounding wire is disconnected
(Class I only)
2. Grounding wire for patient connection and power
supply circuit for measurement are disconnect-
ed (Class I only)
Patient leakage cur-
rent (Patient connec-
tion - Earth)/
(Patient leakage
current I)
 
1. One wire in the power
cord is disconnected.
2. The protective earth
conductor is discon-
nected.
1 Functional grounding wire is disconnected
2. Grounding wire for patient connection and power
supply circuit for measurement are disconnect-
ed
Patient leakage
current
(external voltage on a
SIP/SOP)/
(Patient leakage
current II)
 
1. One wire in the power
cord is disconnected.
2. The protective earth
conductor is discon-
nected.
1. Functional grounding wire is disconnected
2. Metal accessible part not protectively earthed
and grounding wire is disconnected
3. A voltage that is 110% of the rated voltage is ap-
plied between an isolated signal input/output
section and earth
Patient leakage cur-
rent (external voltage
on a specific F-type
applied part)/
(Patient leakage
current III)
 
1. A voltage that is 110% of the rated voltage is ap-
plied between an F-applied part and earth.
(Does not qualify as a single fault condition un-
der IEC 60601-1: 2005 3rd Edition.)
2. Metal accessible part not protectively earthed
and grounding wire is disconnected
3. Functional grounding wire is disconnected
Patient leakage cur-
rent (external voltage
on metal accessible
part not protectively
earthed)
 
1. The protective earth
conductor is discon-
nected.
1. Applied to metal accessible part not protectively
earthed
2. Functional grounding wire is disconnected
Patient auxiliary
current
 
1. One wire in the power
cord is disconnected.
2. The protective earth
conductor is discon-
nected.
Functional grounding wire is disconnected
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