1.5 Types of Leakage Current
12
Leakage current can largely be classified as shown in the table below.
1.5 Types of Leakage Current
Types of
Leakage Current
Overview
Refer-
ence
Page
Earth leakage
current
This refers to electric current that flows through a protective earth conductor to
the ground.
P. 13
Touch current
Enclosure
leakage current
Touch current is electric current that flows through a person who touches an
ungrounded enclosed section of equipment. It does not include current that
flows to the human body in contact with an applied part.
P. 14
Patient leakage
current
Patient leakage current flows through the body of someone connected to the
applied part.
Test items vary based on the type of applied part.
P. 15
Patient auxiliary
current
Electric current that flows between applied parts and through a patient during
normal operation of medical equipment that is not intended to have any physi-
ological effect.
P. 15
Total patient
leakage current
When multiple applied parts are attached to a patient, the total leakage current
must be measured.
The sum of patient leakage current of applied parts is total patient leakage cur-
rent.
P. 19
Protective
conductor current
Electric current that flows through a protective earth conductor (grounding
wire) during normal operating conditions
P. 20
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