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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