4. Class 3. Equipment of this classification is no longer manufactured, and the classification was removed
from IEC 601.1 in 1988. The equipment was powered via an isolating, or safety transformer, which
generated at its secondary winding a “Medical Safety Extra Low Voltage (MSELV).
5. Symbols. A particular degree of protection afforded a patient against an electric shock, arriving from
the applied part, defines the type of applied part. The symbols for each type of protection are shown be-
low:
Type B
Type B
Defib Protection
Type BF
Type BF
Defib Protection
Type CF
Type CF
Defib Protection
B = Classes 1, 2 or 3 equipment, or I.P. equipment providing an adequate degree of
protection against electrical shock, particularly regarding allowable leakage cur-
rents and reliability of the protective earth connection.
BF = Type B equipment with an F-type isolated (floating) applied part.
CF = Classes 1 or 2 equipment, or I.P. equipment providing a high degree of protec-
tion against electrical shock, particularly with regard to allowable leakage cur-
rents, and having an F-type isolated (floating) applied part (cardiac protection).
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